USGS Test Method I-2062

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Method Name:
Arsenic, dissolved, water, hydride_AA.. Official Name: Arsenic, atomic absorption spectrometric, hydride, automated

Organic arsenic-containing compounds are decomposed either by sulfuric acid-potassium persulfate digestion or by ultraviolet radiation. The arsenic so liberated, together with inorganic arsenic originally present, is subsequently reduced to arsine with sodium borohydride.The arsine is stripped from the solution with the aid of nitrogen and is then decomposed in a tube furnace placed in the optical path of an atomic absorption spectrometer.For additional information on the determination of arsenic in water, see Pierce and others (1976), and Fishman and Spencer (1977).

This method may be used to analyze water and water-suspended sediment containing at least 1 ug/L of arsenic. Samples containing more than 20 ug/L need to be diluted. Both inorganic and organic forms of arsenic are determined. To determine only inorganic arsenic, omit the acid-persulfate digestion or the ultraviolet radiation.

Methods for the Determination of Inorganic Substances in Water and Fluvial Sediments, Techniques of Water-Resources Investigations of the United States Geological Survey, Book 5, Chapter A1 Edited by Marvin J. Fishman and Linda C. Friedman

Since the arsine is freed from the original sample matrix, interferences are minimized.A detailed inorganic-interferences study showed that most trace elements at concentration levels of less than 300 ug/L do not interfere (Pierce and Brown, 1976).

QC Requirements:
Calibrate instrument using calibration standards (CAL). Quality control samples (QCS) and laboratory blanks (LB) analyzed at a minimum of I each after every 10 samples. (Reference OFR 95-443).

Maximum Holding Time:
180 days



1-20 ug/L

Precision by replicate analysis by one operator using ultraviolet radiation digestion.

Minimum reporting level.

Revision Number:
Revised 1985

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