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Automation of an ion chromatograph for precipitation analysis with computerized data reduction

Water-Resources Investigations Report 81-78

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Abstract

Interconnection of an ion chromatograph, an autosampler, and a computing integrator to form an analytical system for simultaneous determination of fluoride, chloride, orthophosphate, bromide, nitrate, and sulfate in precipitation samples is described. Computer programs provided with the integrator are modified to implement ionchromatographic data reduction and data storage. The liquid-flow scheme for the ion chromatograph is changed by addition of a second suppressor column for greater analytical capacity. An additional vave enables selection of either suppressor column for analysis, as the other column is regenerated and stabilized with concentrated eluent.

Minimum limits of detection and quantitation for each anion are calculated; these limits are a function of suppressor exhaustion. Precision for replicate analyses of six precipitation samples for fluoride, chloride, orthophosphate, nitrate, and sulfate ranged from 0.003 to 0.027 milligrams per liter. To determine accuracy of results, the same samples were spiked with known concentrations of the above mentioned anions. Average recovery was 108 percent.

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Automation of an ion chromatograph for precipitation analysis with computerized data reduction
Series title:
Water-Resources Investigations Report
Series number:
81-78
Year Published:
1982
Language:
English
Publisher:
U.S. Geological Survey
Description:
iv, 33 p.