EPA Method 1630

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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

Summary:
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.

Scope:
This method determines methyl mercury in filtered and unfiltered water.

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

Interferences:
(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)

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.02-5 ng/L.

Sample Prep:
None.

Precision:
-

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

Revision Number:
Aug-98

Test Description:
Methyl Mercury in Wa