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Determination of arsenic in geological materials by x-ray fluorescence spectrometry after solvent extraction and deposition on a filter

Talanta

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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 L?? peak (2?? 48.73??), to the arsenic K?? peak (2?? 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. ?? 1983.

Additional Publication Details

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
Volume
30
Issue:
12
Year Published:
1983
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Talanta
First page:
967
Last page:
968
Number of Pages:
2