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The Determination of Arsenite and Arsenate Ions in Fish and Shellfish by Selective Extraction and Polarography

Authors :
Reinke, J.
Uthe, J. F.
Freeman, H. C.
Johnston, J. R.
Source :
Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances & Environmental Engineering; 1975, Vol. 8 Issue: 4 p371-380, 10p
Publication Year :
1975

Abstract

Arsenite ion, as arsenic trichloride was extracted into benzene from strongly acidified tissue homogenates. Following this, arsenite was extracted from the benzene into water, made up in 1N HCl and analyzed polarographically. Arsenate ion, left in the homogenate after arsenite extraction is isolated in exactly the same way following treatment of the homogenate with cuprous ion to reduce arsenate to arsenite ion. Treatment of the acidified homogenate with cuprous ion prior to extraction gives a homogenate which is readily analyzed for total “inorganic” arsenic. The method was efficient to a maximum level of about 20 μg inorganic arsenic since at higher levels lower recoveries were found. Analysis of a variety of marine biological specimens, with levels of total arsenic up to 40.5 ppm, indicated little of this arsenic was present in an inorganic form. Post mortem reduction of arsenate to arsenite was found to occur rapidly in fish tissue.

Details

Language :
English
ISSN :
10934529 and 15324117
Volume :
8
Issue :
4
Database :
Supplemental Index
Journal :
Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances & Environmental Engineering
Publication Type :
Periodical
Accession number :
ejs19501261
Full Text :
https://doi.org/10.1080/00139307509437447