USGS Test Method I-2057

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Method Name:
Anions, dissolved, water, IONCHR. Official Name: Anions, ion-exchange chromatographic, 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 be used only for the determination of dissolved bromide, chloride, fluoride, nitrate, nitrite, orthophosphate, and sulfate in water. Samples are injected into an ion-chromatograph and pumped through an anion exchange column which separates the anions. Peaks are measured by a conductivity detector and converted in mg/L by the instrument software.

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

Because bromide and nitrate elute very closely together, they potentially interfere with each other. Bromide-to-nitrate peaks should not exceed 1:10 or 10:1 if both ions are to be quantitated.High levels of organic acids may be present in industrial and domestic wastes which may interfere with inorganic-anion analysis. Two common species, formate and acetate, elute between fluoride and chloride.Water from the sample may cause a negative peak or dip in the chromatogram when it elutes, because its conductivity is less than that of the suppressed eluent.Samples containing high concentrations of chloride or other anions may prevent resolution of closely eluting peaks.Unexpected, late-eluting peaks are a potential source of interference.

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). Method number: I-2057 (no chloride).

Maximum Holding Time:
180 days



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

Precision data was generated by making 10 replicate analyses of many test samples using a single operator. Note: Stated concentration is the average recovery value, not the spiking level.

Minimum reporting level.

Revision Number:

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Analytical testing dots