Determination of arsenic in geological materials by x-ray fluorescence spectrometry after solvent extraction and deposition on a filter
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Abstract
Rock, soil, or sediment samples are decomposed with a mixture of nitric and sulphuric adds. After reduction from arsenic(V) with ammonium thiosulphate, arsenic(III) is extracted as the chlorocomplex into benzene from a sulphuric-hydrochloric acid medium. The benzene solution is transferred onto a filter-paper disc impregnated with a solution of sodium bicarbonate and potassium sodium tartrate, and the benzene allowed to evaporate. The arsenic present is determined by X-ray fluorescence. In a 0.5-g sample, 1–1000 ppm of arsenic can be determined. The close proximity of the lead Lα peak (2θ 48.73°), to the arsenic Kα peak (2θ 48.83°) does not cause any interference, because lead is not extracted under the experimental conditions. Arsenic values obtained are in agreement with those reported for various reference samples.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Determination of arsenic in geological materials by x-ray fluorescence spectrometry after solvent extraction and deposition on a filter |
| Series title | Talanta |
| DOI | 10.1016/0039-9140(83)80223-9 |
| Volume | 30 |
| Issue | 12 |
| Year Published | 1983 |
| Language | English |
| Publisher | Elsevier |
| Description | 2 p. |
| First page | 967 |
| Last page | 968 |