Results 181 to 190 of about 186,729 (218)

Arsenic speciation in iron hydroxide precipitates

Talanta, 1998
In this study a special sequential extraction method is proposed to discriminate between arsenic adsorbed and co-precipitated in precipitates arising mainly from iron hydroxides or bound in low solubility mineral phases. Synthetic iron hydroxide precipitates were prepared to investigate the influence of the amount of arsenate, of the manganese ...
B, Daus, H, Weiß, R, Wennrich
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Arsenic Speciation and Reactivity in Poultry Litter

Environmental Science & Technology, 2003
Recent U.S. government action to lower the maximum concentration levels (MCL) of total arsenic (As) (10 ppb) in drinking water has raised serious concerns about the agricultural use of As-containing biosolids such as poultry litter (PL). In this study, solid-state chemical speciation, desorbability, and total levels of As in PL and long-term amended ...
Yuji, Arai, A, Lanzirotti, S, Sutton, J A, Davis, D L, Sparks   +4 more
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Dimethylthioarsinic anhydride: A standard for arsenic speciation

Analytica Chimica Acta, 2007
Dimethylthioarsinic acid (DMTA(V)) has recently been identified in biological, dietary and environmental matrices. The relevance of this compound to the toxicity of arsenic in humans is unknown and further exposure assessment and metabolic studies are difficult to conduct because of the unavailability of a well characterized standard.
Michael, Fricke, Matthias, Zeller, William, Cullen, Mark, Witkowski, John, Creed   +4 more
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Speciation and Mobility of Arsenic in Agricultural Lime

Journal of Environmental Quality, 2009
Agricultural liming materials are used to correct soil acidity and to improve plant growth and microbial functionality. A relatively low‐grade agricultural lime was found to contain up to 125 mg kg −1 arsenic (As), which is above any fertilizing materials code threshold.
Gerald T, Schmidt, Ka Hei, Lui, Michael, Kersten   +2 more
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Speciation of arsenic and selenium by capillary electrophoresis

Journal of Chromatography A, 2004
Capillary electrophoresis (CE) with direct UV detection, both on-capillary and with a high-sensitivity detection cell (HSDC), were used for the simultaneous determination of arsenite [As(III)], arsenate [As(V)], monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), selenate [Se(VI)], selenite [Se(IV)], selenocystine (SeC), selenomethionine (SeM ...
Baoguo, Sun, Miroslav, Macka, Paul R, Haddad   +2 more
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Arsenic Speciation in Rice Cereals for Infants

Journal of Agricultural and Food Chemistry, 2013
The aim of this study was to conduct a survey of arsenic (As) content in rice cereals for infants. The analysis was based on the FDA Elemental Analysis Manual (EAM 4.11). An inductively coupled plasma mass spectrometer (ICP-MS) was used to determine total As. Due to the different toxicities of the chemical forms of arsenic, the ICP-MS coupled to a high-
Rima, Juskelis, Wanxing, Li, Jenny, Nelson, Jack C, Cappozzo   +3 more
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Arsenic Speciation and Toxicity in Biological Systems

2005
Although it is now commonly accepted that toxicity and bioavailability varies with As species, extensive research has been carried out on biological and environmental samples to assess toxicity and risk associated with As exposure based on total concentrations that may be in error.
Kazi Farzana, Akter, Gary, Owens, David E, Davey, Ravi, Naidu   +3 more
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Unusual arsenic speciation in sea anemones

Chemosphere, 2008
Nine species of sea anemones (Anthopleura asiatica, Actinia equina, Actinodendron arboreum, Phymanthus loligo, Entacmaea actinostoloides, Stichodactyla gigantea, S. haddoni, S. mertensii and Metridium senile) contained arsenic in the range of 1.6-7.0microg As g(-1) (wet mass basis). Irrespective of the species, water-soluble arsenic compounds accounted
Tran Dang, Ninh, Yuji, Nagashima, Kazuo, Shiomi   +2 more
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Solidification/stabilization of arsenic: Effects of arsenic speciation

Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology, 1996
Abstract Chemical identity of arsenic compounds subjected to solidification/stabilization (S/S) is a major factor in determining eventual leachability from the treated material. When several arsenic compounds were treated with portland cement under the same conditions, Toxicity Characteristic Leaching Procedure (TCLP) leachability of arsenic after 28 ...
Pedro Büchler, Rosângela Abdala Hanna, Humayoun Akhtet, Frank K. Cartledge, Marty E. Tittlebaum   +4 more
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Arsenic Toxicity and Accumulation in Turnip As Affected by Arsenic Chemical Speciation

Journal of Agricultural and Food Chemistry, 1999
Arsenic (As) uptake by turnip, growing under soilless culture conditions, was studied. A 4 x 3 factorial experiment was conducted with four As species [arsenite, arsenate, methylarsonic acid (MMAA), dimethylarsinic acid (DMAA)] and three As concentrations (1.0, 2.0, and 5.0 mg L(-)(1)).
A A, Carbonell-Barrachina, F, Burló, D, Valero, E, López, D, Martínez-Romero, F, Martínez-Sánchez   +5 more
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