USGS Test Method I-3055


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Source:
USGS

Method Name:
Antimony, total, water, hydride _AA. Official Name: Antimony, atomic absorption spectrometric, hydride

Description:
Organic antimony-containing compounds are decomposed by adding sulfuric and nitric acids and by repeatedly evaporating the sample to fumes of sulfur trioxide. The antimony so liberated, together with inorganic antimony originally present, is subsequently reacted with potassium iodide and stannous chloride, and finally with sodium borohydride to form stibine. The stibine is removed from solution by aeration and swept by a flow of nitrogen into a hydrogen diffusion flame, where it is determined by atomic absorption at 217.6 nm.

Scope:
This method may be used to analyze water and water-suspended sediment containing at least 1 ug/L of antimony. Samples containing more than 15 ug/L need to be diluted. Total antimony in water-suspended sediment may be determined after each sample has been thoroughly mixed by vigorous shaking and a suitable sample portion has been rapidly withdrawn from the mixture.

Citation:
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

Interferences:
Since the stibine is freed from the original sample matrix, interferences in the flame are minimized. Selenium and arsenic, which also form gaseous hydrides, do not interfere at concentrations of 100 ug/L. Greater concentrations were not tested.

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

Media:
WATER

Subcategory:
Inorganic

Concentration:
1-15 ug/L

Precision:
-

Detection:
Minimum reporting level

Revision Number:
Revised 1985

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