||Atomic Absorption Spectrometric Determination of Arsenite in Water Samples by Graphite Furnace After Extraction with Ammonium sec-Butyldithiophosphate.
Chakraborti, D. ;
Irgolic, K. J. ;
Adams, F. ;
||Texas A and M Univ., College Station. Dept. of Chemistry.;Health Effects Research Lab., Research Triangle Park, NC.
Water analysis ;
Water pollution ;
Chemical analysis ;
Atomic spectroscopy ;
Arsonic acid/methyl ;
Arsinic acid/dimethyl ;
Water pollution detection ;
Atomic absorption spectroscopy ;
Graphite furnace atomic spectroscopy
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Arsenite - but not arsenate, methylarsonic acid, or dimethylarsinic acid - is extracted from water samples by 5 mL of a 0.01M hexane solution of sec-dibutylthiophosphate. A 10 microliters aliquot of the extract is injected into an atomic absorption spectrometer with a graphic furnace for the determination of arsenic. The calibration curve is linear to 1500 microgram As. Quantities of arsenic as low as 100 ng As (0.2 ppb As when contained in 500 mL) can be confidently determined. The method was tested with natural river water and synthetic river water. The relative standard deviations associated with the recoveries of arsenite from natural water and synthetic river water spiked with arsenite range from 4.8 to 8.0%. Ten to 15 arsenite determinations can be completed in 1 h.