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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

Study of the pathway of heavy metals in a sewerage system /

Halday, Ismail. January 2007 (has links)
Thesis (MSc)--University of Stellenbosch, 2007. / Bibliography.
72

An investigation of processes which mediate the mobility of arsenic, cadmium, and chromium in soils and sediments

Randall, Simon Robert January 1999 (has links)
No description available.
73

The bioaccumulation of selected heavy metals in the crab Potamonautes warreni from industrial and mine polluted freshwater ecosystems

Steenkamp, Veronica Elenor 05 August 2014 (has links)
M.Sc. (Zoology) / Please refer to full text to view abstract
74

Removal of heavy metals from a concentrated aqueous solution : adsorption and nanofiltration techniques

Al Rashdi, Badriya Abdullah January 2012 (has links)
No description available.
75

Using organic amendments and chelates for remediation of metal-contaminated soils by vetiveria zizanioides

Chiu, Ki Kin 01 January 2003 (has links)
No description available.
76

Removal of heavy metals from wastewater using granular coal

Saravanabawan, Thirugnana January 1980 (has links)
Batch tests were performed to evaluate the relative performance of four B.C. coals (Hat Creek Oxidised, Kaiser-stock pile refuse, Kaiser-special plant feed and Cominco Ash) in removing heavy metals copper, lead, zinc and mercury from filtered primary sewage treatment plant effluent. Emphasis was placed on metal concentrations of 10 mg/l and less. Hat Creek coal was found to be much superior to the other three and its efficiency is comparable to that of Darco activated carbon 12 x 20. Hat Creek and Kaiser-stock pile refuse coals were further used in column tests to evaluate the relative performance of these coals in removing copper, lead and zinc under dynamic conditions. Again emphasis was placed on influent metal concentrations of 10 mg/1 and less and once more the performance of Hat Creek coal was much superior to that of Kaiser coal. Tests with activated carbon indicate Hat Creek coal to be a close competitor for use in advanced waste treatment for heavy metal removal. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate
77

Assessment of Contamination Levels and Estimation of Dietary Intake of Heavy Metals from Selected Imported Fruits and Vegetables in Ghana

Dzimado, Eric 07 May 2016 (has links)
Levels and dietary intake of heavy metals were assessed and evaluated in thirty two samples of fruit and vegetables collected from supermarkets in Accra, Ghana using atomic absorption spectroscopy. Differences (p <= 0.05) existed in Pb, Cd and Ni concentrations across the commodities collected. Levels of Pb, Cd and Cr exceeded safe limits established by FAO and EU. Washing reduced Cr in cabbage by 59% (p <= 0.05) but only reduced Pb in grapes by 12% (p ˃ 0.05). Estimated daily and weekly intake through fruit and vegetable consumption were below provitional tolerable dietary intake established by the FAO. Although estimated dietary intake obtained in this study were below the maximum established limits, increased comsumption of these fruit and vegetables may bring about adverse health implications for the exposed population.
78

Extraction of heavy metals with supercritical carbon dioxide : a novel approach to heavy metal analysis and decontamination

Wang, Jin, 1954- January 1995 (has links)
No description available.
79

Mobilization of heavy metals from urban runoff sediment by organic ligands. and the subsequent effect on selected freshwater vertebrate and invertebrate species /

Dominie, David R. 01 January 1976 (has links) (PDF)
No description available.
80

The accumulation of heavy metals by aquatic plants

Maharaj, Saroja January 2003 (has links)
Submitted in partial fulfillment of the requirements for the degree in Masters of Technology: Chemistry, ML Sultan Technikon, Durban, 2003. / The pollution of water bodies by heavy metals is a serious threat to humanity. The technique known as phytoremediation is used to clean up these polluted water bodies. The accumulation of heavy metals by aquatic plants is a safer, . cheaper and friendlier manner of cleaning the environment. The aquatic plants -studied in this project are A.sessilis, P.stratiotes, R.steudelii and T.capensis. The accumulation of heavy metals in aquatic plants growing in waste water treatment ponds was investigated. The water, sludge and plants were collected from five maturation ponds at the Northern Waste Water Treatment Works, Sea Cow Lake, Durban. The samples were analysed for Zn, Mn, Cr, Ni, Pb and Cu using ICP-MS. In general it was found that the concentrations of the targeted metals were much lower in the water (0.002 to 0.109 mg/I) compared to sediment/sludge (44 to 1543mg/kg dry wt) and plants (0.4 to 2246 mg/kg dry wt). These results show that water released into the river from the final maturation pond has metal concentrations well below the maximum limits set by international environmental control bodies. It also shows that sediments act as good sinks for metals and that plants do uptake metals to a significant extent. Of the four plants investigated it was found that }t.sessi[ir (leaves, roots and stems) and }A.sessilis (roots and stems) are relatively good collectors of Mn and Cu respectively. These findings are described in the thesis. The concentration of heavy metals in the stems, leaves and roots of the three plants were compared to ascertain if there were differences in the ability of the plant at different parts of the plant to bioaccumulate the six heavy metals studied. / M

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