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View Actual EPA Method 1630 (PDF File)
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