EPA Method 1640

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EPA Method 1640:
Trace Elements in Ambient Waters by On-Line Chelation. Official Name: Determination of Trace Elements in Ambient Waters by On-Line Chelation Preconcentration and Inductively Coupled Plasma-Mass Spectrometry

A sample is acidified and solubilized by gentle refluxing (if total recoverable elements are desired). Elements in a sample are preconcentrated using an iminodiacetate functionalized chelating resin. Group I and II metals, as well as most anions, are selectively separated from the analytes by elution with ammonium acetate at pH 5.5. The elements are subsequently eluted into a simplified matrix consisting of dilute nitric acid and are determined by ICP-MS using a directly coupled on-line configuration.

This method determines dissolved elements in ambient waters at EPA water quality criteria (WQC) levels. It may also be used for determination of total recoverable element concentrations in these waters.

EPA Method Guidance CD-ROM (includes MCAWW Methods, and most current EPA Methods)

(A) Contamination by carryover.(B) Contamination of apparatus by direct and indirect contact.(C) Contamination by airborne particulate matter.(D) Isobaric elemental interferences.(E) Wing overlap of m/z peaks.(F) Isobaric polyatomic ion interferences of similar m/z's(G) Physical interferences.(H) Competing chelators.

QC Requirements:
The minimum requirements consist of an initial demonstration of laboratory capability, analysis of samples spiked with metals of interest to evaluate and document data quality, and analysis of standards and blanks as tests of continued performance.

Maximum Holding Time:
6 months (after preservation)



Not Available.

Sample Prep:


MDL as determined by 40 CFR Part 136, Appendix B.

Revision Number:

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Examples:  8260

Examples:  Dioxin
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