Anwendung eines neuen Feldanalysenverfahrens zur Untersuchung der Stabilität von Arsen und seinen anorganischen Spezies in aquatischen Systemen

Volke, P.; Merkel, Broder J.

doi:10.1002/(sici)1521-401x(199907)27:4<230::aid-aheh230>3.0.co;2-e

Cited by 7 publications

(7 citation statements)

References 13 publications

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“…Both MMAA and DMAA are generally considered to be stable during storage (e.g. Roig-Navarro et al, 2001) although both methylation and demethylation reactions have been observed (Cullen and Reimer, 1989;Hall et al, 1999;Volke and Merkel, 1999;Ariza et al, 2000). The rate of arsenic speciation changes during storage is highly variable and can be suf ciently high to invalidate even the most precise of laboratory analyses.…”

Section: Preservation Of Arsenic Speciation During Storagementioning

confidence: 86%

“…Oxidation of As(III) is the most commonly observed change, although reduction of As(V) has also been observed (van Elteren et al, 1991;Polya et al, 1998;Hall et al, 1999;Volke and Merkel, 1999; this study). Both MMAA and DMAA are generally considered to be stable during storage (e.g.…”

Section: Preservation Of Arsenic Speciation During Storagementioning

confidence: 99%

“…The rate of arsenic speciation changes during storage is highly variable and can be suf ciently high to invalidate even the most precise of laboratory analyses. For example, Rassler et al (1998) reported As(III) in groundwater to be stable for up to 3 months, whereas shorter periods of stabilization are reported by Volke and Merkel (1999) [20 days], Tallman and Shaikh (1980) [3 weeks] and Hall et al (1999) [2 days]. Scudlark and Johnson (1982) report rates of oxidation of 100 mg/l As(III) spikes in untreated water samples of between 0.2 and 100 mg/l/day whilst in this study we observed oxidation rates of unspiked samples of between 0.02 and 27 mg/l/ day (Table 2).…”

Section: Preservation Of Arsenic Speciation During Storagementioning

confidence: 99%

“…(3) Acidi cation of natural water with 0.1% HNO 3 or 0.1% HCl stabilizes speciation for at least 15 days at 22ºC but only after increasing As(III) and at a lesser extent As(V) at the expense of other As species (possibly associated with colloids or dissolved organic matter) Volke and Merkel (1999) Deionized or tap water spiked with As(III) and As(V) 50 50% Tested a range of methods:…”

Section: Processes Changing Arsenic Speciationmentioning

confidence: 99%

“…That speciation changes re ected the nature of the microbes present in the sampled waters was further indicated by the observation of As(V) reduction during storage of waters sampled from New Zealand's Waikato River, in which the importance of As(V) reducing bacteria had previously been noted by McLaren and Kim (1995). Volke and Merkel (1999) and Hall et al (1999) both explained reversals in arsenic speciation changes as being due to microbial activity. We speculate that the substantive, apparently contradictory, observations of arsenic speciation changes during storage by various workers might be explained therefore by the differences in the microbial consortia present and in the availability of nutrients and organic matter in the waters sampled.…”

Section: Seawater Freshwatermentioning

confidence: 99%

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IC-ICP-MS and IC-ICP-HEX-MS determination of arsenic speciation in surface and groundwaters: preservation and analytical issues

Polya¹,

Lythgoe²,

Abou-Shakra³

et al. 2003

Mineral. mag.

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ABSTR ACTUnderstanding the biogeochemical behaviour of arsenic in the weathering and shallow subsurface environment depends critically upon determining the nature and distribution of the chemical species present in natural waters. To this end, coupled ion chromatography-inductively coupled plasma mass spectrometry (IC-ICP-MS) is widely used, though species fractionation during ultrasonic nebulization, and matrix-dependent ionization in the plasma are analytical issues that need to be addressed. Hexapole collision cell technology is shown to be effective in suppressing chloride-based polyatomic interferences. Irrespective of the analytical technique used, As(III)/As(V) ratios of natural waters may change substantially during storage due to (1) differential adsorption of arsenic species on hydrated ferric oxides (HFOs); and (2) microbial activity. A wide range of apparently contradictory speciation changes observed by various workers can be rationalized in terms of the differences of microbial consortia present in different water samples. Arsenic speciation in certain water types can be stabilized for days or even weeks by combined filtration, acidification and refrigeration whilst the addition of EDTA and the use of 0.1 mm filters is indicated for iron-rich waters and waters with high activities of redox-active bacteria, respectively. Although the use of hydrochloric acid has been reported elsewhere as resulting in the apparent oxidation of As(III), we show that for certain water types it acts as an extremely effective preservative of arsenic speciation.

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Section: Preservation Of Arsenic Speciation During Storagementioning

confidence: 86%

Section: Preservation Of Arsenic Speciation During Storagementioning

confidence: 99%

Section: Preservation Of Arsenic Speciation During Storagementioning

confidence: 99%

Section: Processes Changing Arsenic Speciationmentioning

confidence: 99%

Section: Seawater Freshwatermentioning

confidence: 99%

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IC-ICP-MS and IC-ICP-HEX-MS determination of arsenic speciation in surface and groundwaters: preservation and analytical issues

Polya¹,

Lythgoe²,

Abou-Shakra³

et al. 2003

Mineral. mag.

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An integrated sampling/speciation method for inorganic arsenic in soil solution

Weigand¹,

Argut²,

Marb³

et al. 2007

Z. Pflanzenernähr. Bodenk.

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SummaryArsenic mobility, bioavailability, and toxicity in soil-water systems are strongly affected by species distribution. In spite of species-selective analytical tools, results may be biased by postsampling oxidation or reduction of compounds. The scope of this study was to delineate a speciation method for inorganic arsenic integrated with pore-water sampling to prevent problems related to postsampling species transformation. Experiments were performed with exchange cartridges packed with quaternary amine (nitrate-form) to separate anionic arsenate from uncharged arsenite. Standard solutions with varied As(III) : As(V) ratios as well as groundwater and soil-solution samples were studied. Analyses were performed by ICP-MS using either extraction cartridges directly coupled to the instrument or samples obtained by offline speciation tests. Results showed that As(III) passes the packed bed with the rinsing solution, while As(V) is retained on the column and can be released by elution with 0.25 M NH 4 NO 3 .Recoveries between 98% and 116% were insensitive to pH variation (pH 3-8) and competing anions. Groundwater samples from a contaminated site yielded recoveries between 92% and 125% when the sum of As(III) and As(V) was compared to total As. Integration of the speciation scheme with pore-water sampling was tested in a soil-column experiment. Soil material from a fen site with elevated geogenic As contents was subjected to a varying moisture regime. Reducing conditions during prolonged saturation caused a marked increase of As(III) concentrations. Conversely, when the soil was drained, total As levels decreased and were dominated by As(V). Overall, extraction results with standard solutions and natural samples indicate reliable performance of the method in experimental investigations and field studies.

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Arsenic Species Isoformation — A Key Problem for Water Purification

Havezov

Tsekulov

2009

Water Treatment Technologies for the Removal of High-Toxity Pollutants

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Anwendung eines neuen Feldanalysenverfahrens zur Untersuchung der Stabilität von Arsen und seinen anorganischen Spezies in aquatischen Systemen

Cited by 7 publications

References 13 publications

IC-ICP-MS and IC-ICP-HEX-MS determination of arsenic speciation in surface and groundwaters: preservation and analytical issues

IC-ICP-MS and IC-ICP-HEX-MS determination of arsenic speciation in surface and groundwaters: preservation and analytical issues

An integrated sampling/speciation method for inorganic arsenic in soil solution

Arsenic Species Isoformation — A Key Problem for Water Purification

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