National Water Quality Laboratory

Friday October 19, 2018

U.S. GEOLOGICAL SURVEY Open-File Report 93-664

Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory - Determination of Antimony by Automated-Hydride Atomic Absorption Spectrophotometry

By Glenda E. Brown and Betty J. McLain

The analysis of natural-water samples for antimony by automated-hydride atomic absorption spectrophotometry is described. Samples are prepared for analysis by addition of potassium persulfate and hydrochloric acid followed by an autoclave digestion. After the digestion, potassium iodide and sodium borohydride are added automatically. Antimony hydride (stibine) gas is generated, then swept into a heated quartz cell for determination by atomic absorption spectrophotometry.

Precision and accuracy data are presented. Results obtained on Standard Reference Water Samples agree with means established by interlaboratory studies. Spike recoveries for actual samples range from 90 to 114 percent. Replicate analyses of water samples of varying matrices give relative standard deviations from 3 to 10 percent.

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