EPA Method 314.0

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EPA Method 314.0:
Perchlorate in Drinking Water by Ion Chromatography. Official Name: Determination of Perchlorate in Drinking Water Using Ion Chromatography

One milliliter of water is introduced directly into an ion chromatograph equipped with a guard column and a suppressor device. Perchlorate ions are separated and measured using an analytical column and a conductivity detector.

This methods determines perchlorate in reagent water, surface water, ground water and finished drinking water. Specific IC columns and analytical conditions are specified but other columns and conditions may be used.

Methods for the Determination of Organic and Inorganic Compounds in Drinking Water, Volume 1 (EPA/815-R-00-014)

(A) Contamination: Interferences may be caused by contaminants in the reagent water, reagents, glassware, and other sample processing apparatus that lead to discrete artifacts or elevated baselines.(B) Coelution: Direct chromatographic coelution, concentration dependent coelution, and ionic displacement effects (which can shift rentention times) can all cause interferences by coelution. It may be possible to overcome adjusting chromatographic conditions (e.g., changing columns), diluting the sample, or using pretreatment cartridges. Care must be taken when using these steps to ensure that analyses are not adversely effected. (C) Anions: Sample matrices with high concentrations of common anions such as chloride, sulfate, and carbonate may destabilize the baseline.(D) Carry over: Carry over peaks from one analysis to another may also cause interferences as false positives.

QC Requirements:
Initial Demonstration of Capability must show acceptable Demonstration of Accuracy (IDA) and Precision (IDP) and the Method Detection Limit (MDL) must be determined. Recovery for Laboratory Fortified Blanks (LFB) must be 85 - 115%. If samples have perchlorate levels that exceed the Matrix Conductivity Threshold (MCT) then pretreated LFBs must be used to reduce common anion levels and recovery must be 85 - 115%. Recovery of Laboratory Fortified Sample Matrix (LFM) samples or pretreated LFMs (when MCT is exceeded) must be 80 - 120%. Relative Percent Difference (RPD) for field or laboratory duplicates must be + or - 15%

Maximum Holding Time:
28 days



4 - 400 ug/L

Sample Prep:

Precision and accuracy were determined using 8 replicate measurements of fortified reagent water in a single laboratory (see Table 2 of the method), using the equipment and conditions specified in Table 1 of the method. Additional data are available in the method.

The MDL was determined in a single lab using fortified reagent water according to the procedure at 40 CFR 136, Appendix B. The MDL for a specific matrix may differ from those listed, depending on the nature of the sample and the specific instrumentation used.

Revision Number:
Revision 1.0, November 1999.

Test Description:
Perchlorate in DW us

Report Number:

Instrument used for this test: