USGS Test Method I-2058

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Method Name:
Anions, dissolved, water, IONCHR. Official Name: Anions, ion-exchange chromatographic, low ionic-strength water, automated

Chloride is determined sequentially with six other anions by ion-exchange chromatography. Ions are separated based on their affinity for the exchange sites of the resin. The separated anions in their acid form are measured using an electrical-conductivity cell. See method I-2057, anions, ion-exchange chromatographic, auto-mated, and method I-2058, anions, ion-exchange chromatographic, precipitation, automated.

This method may only be used for the determination of dissolved bromide, chloride, fluoride, nitrate, orthophosphate, and sulfate in water with a specific conductance of approximately 100 uS/cm or less.Analysis must be performed on a filtered (rinsed 0.45 um membrane filter) or particulate-free, unacidified sample.

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

A negative peak or dip, which is caused by a combination of water and carbonate, is seen in the chromatogram using a fiber suppressor. This interference is eliminated by adding concentrated eluent to the sample.Because low-ionic strength samples contain low concentrations of these six anions, there will be no unresolved peaks and, therefore, no interferences.Oxalate, acetate, or formate may interfere if present.

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



The range of the method varies by analyte; see the method for more information.

Precision based on analysis of a sample 10 times by a single operator.

Minimum reporting level.

Revision Number:

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