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Calcium gluconate versus hexaflourine in the treatment of hydrofluoric acid exposureBoyd, Courtney. January 2001 (has links) (PDF)
Thesis, PlanB (M.S.)--University of Wisconsin--Stout, 2001. / Includes bibliographical references.
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Analysis of cobalt, tantalum, titanium, vanadium and chromium in tungsten carbide by inductively coupled plasma-optical emission spectrometryArcher, M, McCrindle, RI, Rohwer, ER 17 October 2003 (has links)
Summary
Inductively coupled plasma optical emission spectroscopy (ICP-OES) was used to measure the concentrations
of cobalt, tantalum, titanium, vanadium and chromium in solutions of tungsten carbide. The main advantage
of the method described here lies in the speed, convenience and effectiveness of the dissolution procedure.
Aliquots of powdered tungsten carbide were dissolved in a solution of 5% aqua regia in 30% hydrogen
peroxide. Complete dissolution was usually achieved within 10 min. The accuracy of the method was assessed
by the analysis of certified reference materials, secondary reference materials and matrix spiking. The method
was successfully applied to commercial type samples with differing compositions. Slightly more emphasis was
placed on the measurement of vanadium, since no information on the measurement of this element in solutions
of tungsten carbide, by ICP-OES, has been published. Investigation of the interference effects of the elements in
the sample matrix on each other was essential for accurate results comparable to other published analytical
methods.
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A review of legislative and safety requirements for running the titanium-production pilot plant at Anglo ResearchYumba, Nomsa 07 May 2009 (has links)
Anglo Research is due to commission a novel pilot plant for the manufacturing of titanium
metal from ilmenite ore. The process requires the use of hydrofluoric acid, a very toxic
chemical, in large volumes. A health and environmental study and legislative requirements of
the process were thus required before commencing with the plant design.
Metallurgical processes have resulted in some degree of environmental impact, from water,
air and soil pollution. A prominent example is acid mine drainage, which pollutes ground
water. It is therefore important to ensure that proper steps are taken in minimising or
mitigating negative environmental effects when developing new process routes.
Hydrofluoric acid (HF) is classified as extremely toxic. This acid is very aggressive
physiologically because of the fluoride ion which penetrates the skin and robs the bone tissue
of calcium. Because of the hazardous nature of HF, the following legislations were reviewed:
o Hazardous Substances Act 15 of 1973
o Occupational Health & Safety Act of 1993
o National Road Traffic Act 93 of 1996: Chapter VIII
o National Environmental Management Act 107 of 1998
o Environmental Conservation Act 73 of 1989
HF has been used in many other industrial applications including manufacturing of
fluorocarbons and other chemicals, aluminium manufacturing, petroleum alkylation and
uranium purification.
Steps should be taken to minimise exposure to hydrofluoric acid in areas where there is a
likelihood of worker exposure. Control measures include, but are not limited to,
elimination/substitution and process modification, isolation, engineering controls,
administrative controls, and use of personal protective equipment and hazard
communication. HF is corrosive to most metals and materials of construction suitable for HF
include fluoropolymers and other metal alloys such as nickel based alloy 400.
Every design aspect of the plant must be done in a way that minimises the environmental
and worker exposure to HF. Once safety of the plant design has been extensively reviewed,
the pilot plant can then be built. The success of this campaign will be based not only on the
achievement of process and product specification, but also on whether it was run without any
incidents.
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A comparison of calcium gluconate and Zephiran for the treatment of dermal hydrofluoric acid exposureAlters, Joshua. January 2002 (has links) (PDF)
Thesis--PlanB (M.S.)--University of Wisconsin--Stout, 2002. / Includes bibliographical references.
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The use of hydrofluoric acid in analysis and the behavior of solutions of stannic fluorideFurman, N. Howell January 1900 (has links)
Thesis (Ph. D.)--Princeton University, 1917.
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The use of hydrofluoric acid in analysis and the behavior of solutions of stannic fluorideFurman, N. Howell January 1900 (has links)
Thesis (Ph. D.)--Princeton University, 1917.
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Thin film resistance to hydrofluoric acid etch with applications in monolithic microelectronic/MEMS integrationMcKenzie, Todd G., January 2003 (has links) (PDF)
Thesis (Ph. D.)--School of Electrical and Computer Engineering, Georgia Institute of Technology, 2004. Directed by James Meindl. / Includes bibliographical references (leaves 58-60).
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Determinacao espectroquimica dos elementos lantanideos em compostos de uranio, via separacao cromatografica em coluna de alumina-acido fluoridricoLORDELLO, ANTONIO R. 09 October 2014 (has links)
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00321.pdf: 1033687 bytes, checksum: 312be4825d1fd3951e52d9b6f0049c1c (MD5) / Dissertacao (Mestrado) / IEA/D / Instituto de Química - Universidade de São Paulo - IQ/USP
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Determinacao espectroquimica dos elementos lantanideos em compostos de uranio, via separacao cromatografica em coluna de alumina-acido fluoridricoLORDELLO, ANTONIO R. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:25:02Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:56:16Z (GMT). No. of bitstreams: 1
00321.pdf: 1033687 bytes, checksum: 312be4825d1fd3951e52d9b6f0049c1c (MD5) / Dissertacao (Mestrado) / IEA/D / Instituto de Química - Universidade de São Paulo - IQ/USP
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Avalição \'in vitro\' da resistência ao cisalhamento de braquetes colados em diferentes sistemas cerâmicos / In vitro short-term evaluation of shear strength of brackets bonded to different porcelain systemsBonfante, Luiz Fernando 24 January 2007 (has links)
O tratamento ortodôntico em adultos, nos últimos tempos, tem ganhado popularidade na tentativa de melhorar a estética e a função. No entanto, é uma característica comum nestes pacientes, ter os dentes restaurados com facetas de resina, coroas metalo-cerâmicas e/ou porcelana pura. Neste contexto, o ortodontista se defronta com o desafio de colar braquetes em diferentes sistemas cerâmicos, de capacidade desconhecida de resistir às forças de cisalhamento. Portanto, os objetivos deste trabalho foram: 1) Verificar se a força de cisalhamento em braquetes colados em superfícies de porcelana feldspática e AllCeram é afetada por diferentes tempos de ataque com ácido hidrofluorídrico e 2) Observar se existe uma relação direta entre os valores obtidos da força de cisalhamento e o índice remanescente de adesivo (IRA). Sessenta espécimes de porcelana em formato cilíndrico foram aleatoriamente divididos em 3 grupos de 20 espécimes de acordo com o tempo de ataque do ácido hidrofluorídrico de 1 minuto, 30 segundos e 15 segundos (grupos 1, 2 e 3 respectivamente). Outros sessenta espécimes de porcelana AllCeram, com o mesmo formato e divididos da mesma maneira de acordo com o tempo de ataque ácido (grupos 4, 5 e 6 respectivamente). A colagem dos braquetes na superfície cerâmica incluiu aplicação de silano, colocação de resina fotoativada sobre a base do braquete e cimentação com força padronizada de 500g. Vinte e quatro horas após a cimentação, os espécimes foram submersos em água destilada a 37OC e submetidos ao teste de resistência ao cisalhamento em uma máquina de ensaio universal, com velocidade de 0,5 mm/min, cujos valores registrados em Kgf e convertidos em MPa. O tipo de falha também foi egistrado usando o IRA através de um estereoscópio com magnificação de 4x. A força de cisalhamento mais alta foi registrada no grupo 1 (21.21 MPa), que foi significativamente diferente dos grupos 2, 3, 4, 5 e 6 (11.01, 10.64, 14.31, 10.59, 10.39 MPa, respectivamente). Os valores mais baixos encontrados nos grupos remanescentes não diferiram entre si. A mediana dos escores do IRA para os grupos 1, 2, 3, 4, 5 e 6 foi 2, 3, 3, 0, 3, e 3, respectivamente. O grupo 1 (porcelana feldspática 1 minuto) foi afetado pelos diferentes tempos de ataque com ácido hidrofluorídrico, quando comparado aos grupos 2 e 3, ao passo em que os grupos 4, 5 e 6 de porcelana AllCeram não foram. Não houve relação direta entre o escore do IRA e os valores da força de cisalhamento. / Orthodontic treatment in the adult population has lately gained popularity in an attempt to improve esthetic and function. It is, however, a common feature in these patients, that their dentition is restored by resin veneers, porcelain fused to metal and all ceramic crowns. In this context, the orthodontist faces the challenge of bonding brackets to different porcelain based materials, of unknown ability to resist shear forces. Thus, the aim of this investigation was: 1) to test the null hypothesis that shear strength of brackets bonded to feldspathic and AllCeram porcelain surfaces is not affected by different hydrofluoridric etching times and 2) to test the null hypothesis that there is no direct relation between shear strength values and the adhesive remanescent index (ARI). Sixty feldspathic porcelain disc shaped specimens were randomly divided into 3 groups of 20 each, according to hydrofluoridric acid etching time of either 15, 30 seconds and 1 minute (groups 1, 2 and 3, respectively). Another 60 AllCeram specimens of the same shape were subjected to the same division, according to etching time (groups 4, 5, and 6 respectively). Bonding the brackets to the porcelain surfaces included silane coating, an overlying photoactivated resin and a standardized 500g cementation force. Twenty-four hours after cementation, at 37oC in destilled water, specimens were subjected to a shear force in a universal testing machine at a cross-head speed of 0,5mm/min and shear values registered in Kgf and then converted to MPa. Type of failure was lso recorded using ARI by means of a stereoscope at 4x augmentation. The highest shear strength was found for group 1 (21.21 MPa), which was significantly different than groups 2, 3, 4, 5, and 6 (11.01, 10.64, 14.31, 10.59, 10.39 MPa). The lower values found in the remaining groups were not different among each other. Median ARI scores for groups 1, 2, 3, 4, 5, and 6 were 2, 3, 3, 0, 3, and 3, respectively. The first hypothesis must be partially rejected since only feldspathic porcelain group 1 was affected by different hydrofluoric etching times, when compared to groups 2 and 3, while AllCeram groups 4, 5, and 6 were not. On the other hand, the second null hypothesis must be accepted since no direct relation between ARI score and shear strength values could be determined.
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