Determination of arsenic in glass and raw materials for glass via quartz-tube hydride generation AAS after separation by solvent extraction

Röhr, Udo; Meckel, Lothar

doi:10.1007/bf00322188

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…Arsenic speciation has been more problematic, however, and a number of separation techniques have been employed to resolve the various species. Separation approaches reported in the literature include methods based on sequential volatilization (Braman et al, 1977; Carvalho and Hercules, 1978; Heinrichs and Keltsch, 1982; Tesfalidet and Agrium, 1988; Galban et al, 1993; Moller and Scholz, 1995; Frankenberger, 1998; Anderson et al, 1986; Lopez-Molinero et al, 2001, Lopez-Molinero et al, 1999), liquid-liquid extraction (Kalyanaraman and Khopkar, 1977; Chakraborti et al, 1980; Puttemans et al, 1983; Rohr and Meckel, 1992), arsine generation (Narsito and Agterdenbos,1987; Masscheleyn et al, 1991(20,25); Michel et al, 1992; Howard and Comber, 1992; Cabredo et al, 1995; Burguera and Burguera, 1997), ion exchange (Henry and Thorpe, 1980; Pacey and Ford, 1981; Ficklin, 1983; Aggett and Kadwani, 1983; Gomez et al, 1997; Edwards et al, 1998; Miller et al, 2000; Le et al, 2000; Kim, 2001), ion-pair high-performance liquid chromatography (Grabinski, 1981; Ding et al, 1995; Yalcin and Le, 1998; Le and Ma, 1998; Mattusch and Wennrich, 1998; Szpunar et al, 2000), and reverse-phase high-performance liquid chromatography (Brinckman et al, 1980; Tye et al, 1985; Ebdon et al, 1988; Bohari et al, 2001; Martin et al, 1995; Le et al, 1996; Larsen, 1998; Londesborough et al, 1999). …”

Section: Introductionmentioning

confidence: 99%

Field deployable method for arsenic speciation in water

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Pino

Havezov

et al. 2011

Physics and Chemistry of the Earth, Parts A/B/C

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Contamination of drinking water supplies by arsenic is a world-wide problem. Total arsenic measurements are commonly used to investigate and regulate arsenic in water, but it is well understood that arsenic occurs in several chemical forms, and these exhibit different toxicities. It is problematic to use laboratory-based speciation techniques to assess exposure as it has been suggested that the distribution of species is not stable during transport in some types of samples. A method was developed in this study for the on-site speciation of the most toxic dissolved arsenic species: As (III), As (V), monomethylarsonic acid (MMA) and dimethylarsenic acid (DMA). Development criteria included ease of use under field conditions, applicable at levels of concern for drinking water, and analytical performance.The approach is based on selective retention of arsenic species on specific ion-exchange chromatography cartridges followed by selective elution and quantification using graphite furnace atomic absorption spectroscopy. Water samples can be delivered to a set of three cartridges using either syringes or peristaltic pumps. Species distribution is stable at this point, and the cartridges can be transported to the laboratory for elution and quantitative analysis. A set of ten replicate spiked samples of each compound, having concentrations between 1 and 60 µg/L, were analyzed. Arsenic recoveries ranged from 78-112 % and relative standard deviations were generally below 10%. Resolution between species was shown to be outstanding, with the only limitation being that the capacity for As (V) was limited to approximately 50 µg/L. This could be easily remedied by changes in either cartridge design, or the extraction procedure. Recoveries were similar for two spiked hard groundwater samples indicating that dissolved minerals are not likely to be problematic. These results suggest that this methodology can be use for analysis of the four primary arsenic species of concern in drinking water supplies. Keywordsanalysis; solid-phase extraction; speciation; As (III); As (V); monomethylarsonic acid (MMA); dimethylarsenic acid (DMA)

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Section: Introductionmentioning

confidence: 99%

Field deployable method for arsenic speciation in water

Voice

Pino

Havezov

et al. 2011

Physics and Chemistry of the Earth, Parts A/B/C

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“…The conjugate acids of As(III) and As(V) are expressed as H3AsO3 and H3AsO4, respectively. A trivalent arsenic anion (H2AsO3 -) has been favorably extracted to an organic phase using dithiocarbamates, 4-9 dithiols 10 or inorganic acids of high concentration, [11][12][13] whereas these reagents showed rather poor extractability for pentavalent arsenic. Therefore, arsenic(V) is often reduced to arsenic(III), [14][15][16] or converted to the heteropolyacids [17][18][19] or the catechol complex, 20 prior to extraction.…”

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confidence: 99%