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Sedan 1950-talet har åkermarken i Sverige minskat med en miljon hektar. Samtidigt ökar befolkningsmängden stadigt och i Stockholms län beräknas invånarantalet passera tre miljoner till 2040. För att kunna möta behoven av både mat, boende och infrastruktur krävs noggrann planering för att inte förstöra viktiga möjligheter och resurser för framtida generationer. Syftet med rapporten är att med hjälp av en litteraturstudie och en intervju undersöka olika marktypers egenskaper och dess lämplighet inom olika användningsområden i Stockholms län. Vidare undersöks hur olika marktyper, främst åkermark, värderas i kommunernas planeringsprocesser idag. Lämpliga områden för odling respektive byggnation karteras också i ArcGIS och jämförs med regionala planer för länet. Resultatet visar att den enskilt viktigaste egenskapen för vilka marker som är bäst lämpade för jordbruk respektive byggnation är den geologiska sammansättningen. För åkermark krävs en lerig jordart, det vill säga en mycket liten kornstorlek, för att exempelvis kunna binda vatten och näringsämnen till växterna. Mycket finkorniga jordarter som lera och silt är däremot mindre lämpliga att bygga ur geoteknisk synpunkt, då främst morän men även berg och sand är att föredra. Idag räknas åkermarken som ett väsentligt samhällsintresse av nationell betydelse men det finns inget som förhindrar kommuner att exploatera dessa områden. Skyddet av åkermark är idag ett mycket omdiskuterat ämne och många aktörer, däribland Jordbruksverket och olika riksdagspartier, har länge argumenterat för att stärka skyddet av detta. Mycket av den samhällsplanering som sker idag baseras på den åkermarksgradering som utfördes 1971 baserat på skördestatistik från 1969. Den värdering av åkermark som kommuner och myndigheter har att utgå ifrån vid bland annat översiktsplanering och bedömning av mark är således femtio år gammal. Detta medför en risk att marker prioriteras felaktigt och inte utnyttjas på bästa sätt då dess egenskaper kan ha förändrats under ett halvt sekel. En ny åkermarksgradering är därför en viktig prioritet. / Since the 1950s the arable land in Sweden decreased with a million hectares. At the same time the population is steadily increasing and in the region of Stockholm the total population number is estimated to reach three million before 2040. To meet the demands of food, housing and infrastructure it takes careful planning to not destroy important values and resources for future generations. The objective of this report is to analyze different soil properties and their eligibility in different areas of use in the region and how soil, mainly arable soil, is valued in municipalities planning today. This is done with a literature study and an interview and also mapping in ArcGIS. The result shows that the single most important property in deciding which soils are most suitable for agriculture and building is the geological structure. Arable land needs a loamy soil to be able to provide water and nutrients for the plants. Building requires a larger size of particles and soil types like moraine, rock and sand is more suitable. Arable land is today considered as a public interest of national importance but there is nothing prohibiting municipalities to exploit these areas. The protection of arable land is a widely discussed subject and many actors, among others the Swedish Board of Agriculture and government parties, has argued to increase the protection. A major portion of the current community planning is based on the grading of arable land made in 1971, based on harvest statistics from 1969. Consequently, the valuation of arable land that is accessible for municipalities and authorities is fifty years old. This causes a risk that soil areas is wrongly prioritized and not used for the most suitable purpose as its properties may have changed during half a century. A new grading of arable land is therefore an important prioritization.

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No description available.

The Deep Mixing Method (DMM) is a widely used, in-situ ground improvement technique that modifies and improves the engineering properties of soil by blending the soil with a cementitious binder. Laboratory specimens were prepared to represent soil improved by the wet method of deep mixing, in which the binder is delivered in the form of a cement-water slurry. To study the influence of curing temperature on the strength of the treated soil, specimens were cured in temperature-controlled water baths for the desired curing time. After curing, unconfined compressive strength (UCS) tests were conducted on the specimens. To investigate the optimum mix design for the wet method of deep mixing, UCS tests were performed to measure the strength of cured specimens, and laboratory miniature vane shear tests were conducted on uncured specimens to measure the undrained shear strength (su), which is used to represent the consistency of the mixture right after mixing. The consistency is important for field mixing because a softer mixture is easier to mix thoroughly. Based on the UCS test results, an equation that can provide a good fit to the strength data of the cured binder-treated soil is proposed. When the curing temperature was changed during curing, the UCS of the specimen cured at a low temperature and then cured at a high temperature was greater than the UCS of the specimen cured at a high temperature first. This seems to be due to different effects of elevated curing temperatures at early and late curing times on the cement reaction rates, such that elevating the curing temperature later produces a more constant reaction rate, which contributes to the reaction efficiency. An optimum mix design that minimizes the amount of binder while satisfying both a target strength of the cured mixture and a target consistency of the uncured mixture can be established by using the fitted equations for UCS and su. The amount of binder required for the optimum mix design increases as the plasticity of the base soil increases and the water content of the base soil (wbase soil) decreases. / Master of Science / The Deep Mixing Method (DMM) is a ground improvement technique widely used to improve the strength and stiffness of loose sands, soft clays, and organic soils. The DMM is useful for both inland and coastal construction. There are two types of deep mixing. The dry method of deep mixing involves adding the binder in the form of dry powder, and the wet method of deep mixing involves mixing binder-water slurry with the soil. The strength of the cured mixture is significantly influenced by the amount of added cement and water, the curing time, and the curing temperature. This research evaluates the influence of curing temperature on the strength of cured cement-treated soil mixture. Mixture proportions and curing conditions also influence the consistency of the mixture right after mixing, which is important because it affects the amount of mixing energy necessary to thoroughly mix the binder slurry with the soil. This research developed and evaluated fitting equations that correlate the cured mixture strength and the uncured mixture consistency with mixture proportions and curing conditions. These fitting equations can then be used to select an economical and practical mix design method that minimizes the amount of binder needed to achieve both the desired cured strength and uncured consistency. The amount of binder required for the optimum mix design increases as the plasticity of the base soil increases and the water content of the base soil (wbase soil) decreases.

Thesis (PhD (Soil Science))--University of Stellenbosch, 2007. / Trace elements occur naturally in soils, usually at low concentrations (<0.1% or <1000 mg kg-1 of the earth’s crust), as a result of weathering and pedogenic processes acting on the rock fragments from which soil develops (parent material). Since about 98% of human food is produced on land, soil is the primary source supplying these elements to the food chain. Although cases of trace element deficiency and toxicity have been documented in many parts of South Africa, no comprehensive description of trace element concentration has yet been attempted for South Africa as a whole. The Natural Resources Land Type mapping project, initiated in the mid-1970s, has provided a collection of samples (approximately 4500) from soil profiles selected to represent the main soil forms in each land type and therefore to provide representative coverage of most of the soils of South Africa. These archived samples have now been analysed for a spectrum of trace elements, in terms of both available and total concentrations as well as other soil properties. Although detailed information is available on a wide range of trace metals, the seven trace metals considered to be of most interest in a South African context due to natural geological occurrences were selected for this study, including Cd, Co, Cr, Cu, Pb, Ni and Zn. This data was used to: • determine baseline concentrations in SA soils; • determining threshold values for South African agricultural soils receiving sewage sludge at agronomic rates; • determining the influence of certain soil properties on the baseline concentrations of these trace elements in SA soils; and • development of a bioavailable trace element distribution map for SA. The range, the mean and standard deviation (both arithmetic and geometric), and the median were used to summarize the data statistically. The baseline concentration range was calculated using the quotient and product of the geometric mean and the square of the geometric standard deviation, including data below the instrument detection limit. The upper limit of the baseline concentration range was set at the 0.975 percentile value of the population in order to minimize the influence of contamination and the lower limit at the 0.025 percentile value to minimize problems that might be associated with analytical uncertainty near the lower limit of detection. The quantile regression statistical approach was followed to illustrate the relationship between soil properties and trace element concentrations in soils. The soil properties that showed the strongest relation were CEC, clay content, pH (H2O) and S value (base status). The soils were then divided into different classes according to these soil properties and baseline concentrations were derived for the different classes. Soils with low clay contents have lower trace element concentrations than soils with higher clay contents, soils with low or high pH levels have lower trace element contents than soils with intermediate pH values and mesotrophic soils have higher trace element concentrations than dystrophic soils. This information is useful for the compilation of trace element distribution maps for South Africa where different soil forms and series/families could be classified into different classes to determine areas of potential deficiencies as well as toxicities. South Africa, with its diverse geology, has areas of both trace element toxicities and deficiencies and for decision-making purposes it is necessary to identify these areas. Mapping of trace element levels based on soil samples would provide valuable information, which cannot be obtained from geological or geographical maps. Statistical analyses of the data (clay %, base status, pH (H2O) and NH4EDTA extractable trace element concentrations) indicated that soils could be divided into five trace element classes based on their clay content, pH and base status (dystrophic, mesotrophic and eutrophic). The soil series according to the binomial soil classification system for South Africa were then divided into these different classes. The geometric means for each clay class were determined and the baseline concentration range for each class was calculated. The land type maps were used as basis for the distribution maps. A general trace element distribution map for South Africa was derived from this data as well as Cu and Zn distribution maps. A random selection of 500 soil samples across the country was used to verify the accuracy of the distribution map. The general trace element distribution map indicate, with a confidence level between 89 and 96%, where the potentially available trace element content of South African soils are low (deficient) too moderately high, excluding rocky areas and areas with limited soil. The Cu and Zn maps indicate the distribution and expected baseline concentrations of these specific elements in South African soils. The same methodology could be applied to derive risk maps for all the individual trace elements to indicate the distribution and expected baseline concentrations of the elements in South Africa. This presentation of baseline concentrations, reflecting likely natural ranges in South African soils, is the first quantitative report on the spatial extent and intensity of Zn, Cu and Co deficiency in South African soils. The proposal of new threshold values for trace elements in agricultural soils will be valuable in setting more realistic norms for environmental contamination that accommodate the geochemical peculiarities of the region, one example being rather high Cr and Ni concentrations with low bio-availability. This information should be of value not only in environmental pollution studies but also in health, agriculture, forestry and wildlife management. The following recommendations are made: • The baseline concentrations could be used to determine site specific threshold values based on soil properties and soil type. Soils with lower pH, clay content and CEC would require more protection than soils with high pH, clay content and CEC and therefore the threshold levels for these soils should be lower. • Although the distribution maps can be used to indicate broad areas of trace element deficiencies and toxicities, more detailed investigations are recommended for areas where problems are experienced. The same methodology could be applied on smaller scale to increase the value of the map and to add more value on a regional scale. The maps could be used for regional soil quality assessment especially in areas where trace element deficiencies or toxicities could result in negative effects on plants and animals.

To date, most studies on the effectiveness of geotextiles on soil erosion rates were conducted in laboratory experiments for &lt;1 h. Hence, at Hilton, East Shropshire, UK, this study investigated the effectiveness of palm-mat geotextiles (Borassus and Buriti mats) in reducing rainsplash erosion, runoff and soil loss and changing selected soil properties under field conditions over two years (January 2007-January 2009). Mat-cover effects on rainsplash erosion were studied in two sets on a loamy sand soil (0o slope). In both sets, six randomly-selected plots (each 1 m2) were completely matcovered and six were bare. Unlike Buriti mats, Borassus mat-cover on bare soil significantly (P&lt;0.001) decreased rainsplash erosion (by ~89%). Duplicate runoff plots (10 x 1 m on a 15o slope) had five treatments (bare, permanent grass, Borassus completely-cover, Borassus buffer strip and Buriti buffer strip). Using Borassus buffer strips (area coverage ~10%) on bare soil decreased runoff by ~71% (P&gt;0.05) and soil erosion by ~92% (P&lt;0.001). Borassus buffer strip, Buriti buffer strip and Borassus completely-covered plots had similar effects in decreasing runoff and soil loss. However, the longevity of Borassus mats was ~twice that of Buriti mats. Despite physical protection, runoff control and sediment entrapment, biomat buffer zones may considerably alter and protect flow direction by presenting barriers and creating several cross-drains. Except Borassus completely-covered plots, all plots had significant (P&lt;0.05) increases in topsoil (0-5 cm) bulk density and decreased aggregate stability. However, buffer strips were more effective in trapping fine particles than Borassus completely-covered plots. No treatments had significant (P&gt;0.05) effects on changes in pH, soil organic matter, total soil carbon or N. Plots with Borassus mats significantly (P&lt;0.05) increased total P and decreased total Ca. Treatments had no significant effects on changes in total S, Mg, Zn, Cu, Fe, Mn, Mo or Cl concentrations. Borassus buffer strips can effectively conserve soil and water and improve and maintain selected soil properties, with results similar to Borassus completely-covered plots. The mechanisms explaining the effectiveness of buffer zones require further studies under varied pedo-climatic conditions.

While contaminated food products are known to be a leading source of exposure to potentially toxic elements (PTEs), for the general population, few studies have been carried out to examine PTEs levels in soils and plants in wet tropical regions such as Brazil. While the most commonly used index for estimating PTEs accumulation in vegetables and the subsequent exposure to humans who eat them is the bioconcentration factor (BCF) - the ratio between the concentration of metals in the edible portions of produce and their total concentration in soils - the BCF does not provide an adequate description of soil-to-plant metal transfers. A better understanding of such transfers requires information about the soil attributes that influence the availability of PTEs to plants. The state of São Paulo (SP) is the largest consumer of vegetables in Brazil, as well as the largest and most diversified producer. Studies are therefore needed on PTEs concentrations in soils and vegetables, in order to assess their quality under guidelines established by Brazilian legislation. It is likewise crucial to establish critical limits of these elements in soils, via models that assess risks to human health, based on data that reflect current conditions in the soils of São Paulo. The objectives in this study were: (i) to characterize and to evaluate the relations between the concentrations of Cd, Cu, Ni, Pb and Zn in soils and in vegetables from the \"Green Belt\" of the state of São Paulo, Brazil, taking the limits established by legislation into account; (ii) to develop empiric models to derive appropriate soil screening values and to provide an accurate risk assessment for tropical regions; (iii) to develop proposals for improved human health-based screening values for Cd, Cu, Ni, Pb and Zn in São Paulo soils, using soil - vegetable relations. With the exception of Cd, there was a positive correlation between pseudototais and bioavailable contents of PTEs. Cd and Pb content in plants, moreover, not significantly correlated with any of the variables studied. All models of random forests and trees were good predictors of results generated from a regression model and provided useful information about which covariates were important to forecast only for the zinc concentration in the plant. The soil-plant transfer models proposed in this study had a good performance and are useful for eight of the ten combinations (five metals versus two species). SP data combined with NL data for Cd in lettuce and for Ni and Zn in lettuce and in carrot when pH, organic carbon - OC and clay contents were included in the model. Including such soil properties results in improved relations between PTEs concentrations in soils and in vegetables to derive appropriate screening values for SP State. The model in which pH, OC and clay contents were included gave the most useful results with SP and NL data set combined for Cu, Pb, Zn in lettuce and for Cd and Cu in carrot. Our setup did not work for Ni and for Pb in carrot because the data models gave an inconsistent result and the combination of datasets did not or insufficiently improve the results. / Uma das principais vias de exposição de elementos potencialmente tóxicos (EPT) para a maioria da população é por meio da ingestão de alimentos, mas poucos são os estudos relacionados às concentrações de EPTs em solos e em vegetais de regiões tropicais úmidas, sobretudo no Brasil. O índice mais comumente utilizado para estimar o acúmulo de EPTs em vegetais e a subsequente exposição humana pelo consumo de vegetais é o fator de bioconcentração (BCF), que é a razão entre a concentração de metais em partes comestíveis de hortaliças e da concentração total do metal no solo. Porém, o BCF não descreve adequadamente a transferência solo-planta de metais. Assim, a utilização de relações envolvendo os principais atributos dos solos que influenciam a disponibilidade dos EPTs às plantas pode explicar com mais detalhe as relações solo-planta. O estado de São Paulo é o maior mercado consumidor, além de ser o maior e mais diversificado produtor olerícola no Brasil. Assim, são necessárias pesquisas referentes às concentrações de metais pesados em solos e hortaliças, para avaliação da qualidade dos mesmos em relação aos limites estabelecidos pela legislação. Os objetivos neste trabalho foram: (i) caracterizar e avaliar as relações solo-planta entre as concentrações de Cd, Cu, Ni, Pb e Zn em solos e olerícolas de folhas e raiz no estado de São Paulo, tendo em vista os limites estabelecidos pela legislação; (ii) desenvolver modelos empíricos para poder derivar adequados limites críticos do solo e fornecer uma avaliação de risco precisa para regiões tropicais; (iii) desenvolver propostas para melhorar os limites críticos baseados na saúde humana para Cd, Cu, Ni, Pb e Zn em solos de São Paulo, utilizando relações solo-planta adequadas para as condições tropicais. Com exceção do Cd, houve correlação positiva entre os teores pseudototais e biodisponíveis dos EPTs. Os teores de Cd e de Pb nas plantas, por outro lado, não correlacionaram significativamente com nenhuma das variáveis estudadas. Os modelos de florestas aleatórias e árvores foram bons preditores de resultados gerados a partir de um modelo de regressão e forneceram informações úteis sobre quais covariáveis foram importantes para previsão apenas para o teor de Zn na planta. A aplicação de modelos de transferência solo-planta proposto neste estudo tiveram bom desempenho e foram úteis para oito das dez combinações (cinco metais contra duas espécies). O conjunto de resultados de SP pode ser combinado com o da Holanda usando o modelo em que se incluem pH, teor de carbono orgânico - CO e teor de argila para Cd em alface e para Ni e Zn na alface e na cenoura. O modelo foi mais eficiente com os conjunto de resultados combinados para Cu, Pb, Zn, em alface e para Cd e Cu na cenoura. A abordagem não foi eficiente para Ni e para Pb em cenoura, com resultados incoerentes para os conjuntos de resultados combindados ou separados, para os quatro modelos testados.

A vegetação de restinga é uma formação típica que ocorre na costa brasileira em materiais de origem quartzosos e pobres em nutrientes. O principal processo pedogenético que ocorre nos solos sob essa vegetação é a podzolização, sendo os Espodossolos e os Neossolos com podzolização incipiente os solos mais comumente encontrados. A podzolização é freqüentemente estudada em regiões de clima frio, sendo escassos os estudos dos mesmos em clima tropical e desenvolvidos sobre sedimentos marinhos quartzosos. Foram coletados e descritos morfologicamente nove perfis de solos sob vegetação de restinga na Ilha do Cardoso-SP com o objetivo de caracterizá-los em sua química, física, morfologia, mineralogia e estudar a dinâmica do Fe e do Al nestes solos com o intuito não só de se compreender melhor a gênese dos mesmos como para contribuir com o aprimoramento do Sistema Brasileiro de Classificação de Solos (SiBCS). Os resultados mostraram solos hidromórficos, arenosos, muito ácidos, com teores variáveis de matéria orgânica e fases não cristalinas Al e Fe, sendo que o Al é o metal que participa mais efetivamente do processo de podzolização, o qual é altamente dependente da hidromorfia. Este fato é evidenciado pela microtopografia, que exerce papel importante na distribuição dos solos. Foi identificada pirita em alguns horizontes (2Cgj), os quais apresentam características distintas em relação aos demais, tais como textura mais fina e presença de esmectita. Este material de origem influencia até os horizontes espódicos, reduzindo o pH bruscamente na determinação da TFSA (terra fina seca ao ar), devido à influência indireta promovida pelo lençol freático. Nos horizontes espódicos, os principais minerais encontrados foram o feldspato e o quartzo na fração silte e a caulinita e o quartzo na fração argila, evidenciando uma assembléia mineralógica mais pobre em relação a outros Espodossolos de clima frio e até mesmo em relação a outros da costa brasileira. Isso ocorre devido principalmente ao próprio material de origem ser muito pobre em minerais primários intemperizáveis. O SiBCS mostrou falhas na classificação da ordem Espodossolos a partir do 2º nível categórico (subordem), principalmente no que diz respeito ao acúmulo de Fe no horizonte espódico. Sugerese a inserção da denominação "tiônico" no quarto nível categórico, devido à possibilidade da ocorrência de solos tiomórficos, se forem drenados, bem como a adoção de um critério químico na distinção das subordens dos Espodossolos. As relações Carbono/Metal evidenciaram a baixa participação do Fe, sendo o Al o responsável pela precipitação química do complexo organometálico. Os Espodossolos estudados são holocênicos e a podzolização é dependente da hidromorfia. A presença de sulfetos de ferro afeta parte dos solos estudados e pode coincidir com horizontes espódicos. / Restinga vegetation is a typical formation that occurs in brazilizan coast, on quartzitic, sandy poor parent material. The main pedogenic process that occurs in soils under this vegetation is the podzolization, being the Spodosols and Quartzipsamments, with incipient podzolization, the most common soils. Podzolization is frequently studied in regions of cold climate, with a lack of studies in tropical climate and quartzitic material. Nine soil profiles under restinga vegetation at Ilha do Cardoso, São Paulo State, had been sampled and morphologically described with the objective to proceed chemical, physical, morphological and mineralogical characterization and study Fe and Al dynamics in these soil with the aim of better comprehend its genesis, as well as contribute to an improvement of the Brazilian System of Soil Classification (SiBCS). The results had shown aquic, sandy, very acid soils with variable contents of organic matter and Al and Fe non crystalline phases. Al appears to be the metal that participate more effectively on podzolization process, which is highly dependent on aquic conditions. Being so, microtopography plays an important role in soil distribution. Pyrite and smectite was also identified in clay horizons (2Cgj) related to a distinct parent material. This material also influences spodic horizon chemistry generating low pH values in dried samples due to water table effects. Spodic horizons are mainly constitute by feldspar and quartz, in the silt fraction, and kaolinite and quartz, in the clay fraction, evidencing a poor mineralogical assembly in relation to other Spodosols of cold climate and even to those of Brazilian coast. This mainly occurs due to parent material which presents few weatherable primary minerals. SiBCS showed imperfections in the classification of Spodosols from 2nd categorical level (suborder), mainly because the absence of a chemical criteria for Fe accumulation in spodic horizon. We suggest the insertion of "thionic " denomination in the 4th categorical level because of the possible formation of acid sulphate soils in response to drainage, as well as the adoption of a chemical criteria in the distinction of subordens of Spodosols. Carbon/Metal ratios had evidenced low participation of Fe, being Al responsible for chemical precipitation of organo-metallic complex. Our Spodosols are holocenic and podzolization process depends on aquic conditions. Presence of iron sulfides affects some of the studied soils an also coincide with spodic horizons.

Apesar da reconhecida importância ecológica dos manguezais estes ecossistemas continuam sofrendo impactos antrópicos, que atingem não só a fauna e a flora como também os seus solos, por sua vez, ainda pouco estudados. Este trabalho teve por objetivo estudar as características mineralógicas e fisico-químicas dos solos de mangue do rio Crumahú, no município do Guarujá, junto aos Bairros Morrinhos e Vila Zilda, e realizar um diagnóstico da contaminação do solo e da água neste ambiente em função da descarga de esgoto doméstico. Foram realizadas amostragens, em 03 profundidades, em 02 transeções e em 14 pontos-controle realizando-se medições de pH, Eh e OD. No laboratório, foram realizadas análises químicas e físicas para fins de classificação além de difratogramas de raios-X (frações silte e argila) e imagens por microscopia eletrônica de varredura. Para um dimensionamento do grau e extensão da contaminação da área determinou-se: teores totais de metais pesados (Cd, Cr, Cu, Ni, Pb e Zn) e os valores da relação &#948; 15 N ao longo do curso do rio. Os diferentes solos encontrados, enquadrados no grupo dos potenciais solos ácidos sulfatados (PSAS), foram classificados como: ORGANOSSOLO TIOMÓRFICO Fíbrico típico, textura argilosa (Ojm), ORGANOSSOLO TIOMÓRFICO Hêmico típico, textura muito argilosa (Ojy), ORGANOSSOLO TIOMÓRFICO Hêmico típico, textura argilosa (Ojy) e GLEISSOLO TIOMÓRFICO Hístico sódico, Ta, textura argilosa, horizonte A hístico, hipereutrófico, esmectítico, moderadamente ácido (Gji). Sugere-se a inclusão dos caracteres sálico e sódico no quarto nível categórico da ordem dos ORGANOSSOLOS no Sistema Brasileiro de Classificação de Solos. A assembléia mineralógica dos solos, composta por caulinita, esmectita-glauconítica, glauconita, muscovita, ortoclásio e quartzo, é governada por condições geoquímicas presentes (halomorfia e salinólise) e pretéritas, enquanto as condições físico-químicas favorecem o processo da piritização. Os parâmetros OD, &#948; 15 N e teores totais de metais indicam que a qualidade da água e dos solos de mangue do rio Crumahú se encontra comprometida em função disposição do esgoto doméstico. / Despite the importance already detached of the mangroves, these ecosystems are still suffering from antropic impacts, which affect not only fauna and flora but also the mangrove soils that remain unstudied. The objectives of this work consisted in the study of the mineralogical, physical and chemical characteristics of the Crumahú river mangrove soils, from Guarujá municipal district, close to Morrinhos and Vila Zilda districts, and also accomplish a contamination diagnosis of soil and water in this environment due to the discharge of domestic wastewater. Samplings were carried out in 03 depths, in 02 transects and 14 sampling control-points. In the field, measurements of pH, Eh and DO were acomplished and, in the laboratory, aiming the classification, rotine physical and chemical analysis. For the characterization of mineralogy X-ray diffractions and scanning electron microscopy (SEM) were obtained. To the dimensioning of the area contamination degree and extension, the following were determined: trace elements (Cd, Cr, Cu, Ni, Pb e Zn) and the relation &#948; 15 N values along the bank river. Soils fit in the group of potential acid sulfate soils (PASS) and were classified as: Typic Euic Sulfihemists (USDA) Thionic Fibric Rheic Histosol (FAO); Typic Euic Sulfihemists (USDA) Salic Thionic Rheic Histosol (FAO); Typic Euic Sulfihemists (USDA) Salic Thionic Rheic Histosol (FAO); Histic Sulfaquent (USDA) Histic Sulfurithionic Gleysol (FAO), respectively. Mineralogical assembly of soils is composed by kaolinite, glauconitic-smectite, muscovite, orthoclase and quartz, being ruled by the present and preterit geochemical conditions (halomorphic and salinolitic). The soil physical and chemical conditions assist the piritization process, therefore insert in the pyrite geochemical stability. The parameters DO, &#948; 15 N and trace metals concentrations indicate that the Crumahú river mangrove water and soils quality are affected due to the domestic wastewater disposition in the area.