EPA Method 1630

ALS - Columbia offers EPA Method 1630 testing at these laboratories:

Kelso Kelso, Washington Laboratory

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EPA Method 1630:
Methyl Mercury in Water. Official Name: Methyl Mercury in Water by Distillation, Aqueous Ethylation, Purge and Trap, and CVAFS

The sample is distilled with reagents to form methylethyl mercury (MEM) from methyl mercury. The MEM is purged from the sample with nitrogen onto a graphitic carbon trap. The MEM is thermally desorbed into an inert gas that carries the released MEM first through a pyrolytic decomposition column and then into the cell of a cold-vapor atomic fluorescence spectrometer (CVAFS). The concentration of MEM determined at the CVAFS corresponds to the concentration of methyl mercury.

This method determines methyl mercury in filtered and unfiltered water.

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

(A) Labware contamination (B) Reagent contamination (C) Sampling equipment contamination (D) Human contact

QC Requirements:
The minimum requirements consist of an initial demonstration of laboratory capability, ongoing analysis of standards and blanks as a test of continued performance, and the analysis of matrix spikes (MS) and matrix spike duplicates (MSD) to assess accuracy and precision.

Maximum Holding Time:
6 months (after preservation)48 h (after sampling if not preserved at time of collection)



0.02-5 ng/L.

Sample Prep:


The method detection limit (MDL) as determined by 40 CFR 136, Appendix B.

Revision Number:

Test Description:
Methyl Mercury in Wa

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Examples:  8260

Examples:  Dioxin
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