Mercury Research Lab
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Methods used for common analysis types
Analysis type codes and definitions are found on the back of the Request for Analysis form.
Cross-reference of Lab Analysis Codes to Methods Used
MRL code |
NWIS code |
Description |
Detection Limit |
Method Reference |
Water |
| FTHG |
P50287 |
Filtered total mercury |
0.04 ng/L |
EPA Method 1631, Rev. E |
| FMHG |
P50285 |
Filtered methylmercury |
0.04 ng/L |
USGS Open-File Report 01-445 |
| UTHG |
P50286 |
Unfiltered total mercury |
0.04 ng/L |
EPA Method 1631, Rev. E |
| UMHG |
P50284 |
Unfiltered methylmercury |
0.04 ng/L |
USGS Open-File Report 01-445 |
| PTHG |
P62976 |
Particulate total mercury |
0.059 ng/filter |
USGS Techniques and Methods 5A-8 |
| PMHG |
P62977 |
Particulate methylmercury |
0.01 ng/filter |
USGS Techniques and Methods 5A-7 |
| DOC |
P00681 |
Dissolved organic carbon |
not yet determined |
Shimadzu - catalytically-aided platinum 680°C combustion technique |
| TOC |
P00680 |
Total organic carbon |
not yet determined |
Shimadzu - catalytically-aided platinum 680°C combustion technique |
Bedsediment and Soil |
| STHG |
P62978 |
Sediment total mercury |
0.3 ng/ analytical aliquot |
USGS Techniques and Methods 5A-8 - acid digestion |
| 1.38 ng/g |
EPA Method 7473 (SW-846) Rev. 0 - direct combustion |
| SMHG |
P62979 |
Sediment methylmercury |
0.08 ng/g |
USGS Techniques and Methods 5A-7 |
| DRY_WT |
P64177 |
Dry weight percent (percent solids) |
not applicable |
USGS Techniques of Water-Resources Investigations 5-A1, 3rd ed., p. 48 |
| LOI |
P64178 |
Percent loss on ignition |
not applicable |
USGS Techniques of Water-Resources Investigations 5-A1, 3rd ed., p. 451 |
Plant and Animal Tissue |
| BMHG |
not yet assigned |
Biological methylmercury |
determined per analytical batch |
- dilute nitric acid digestion per "Bioaccumulation and Trophic Transfer of Methylmercury in Long Island Sound," 2006, Chad R. Hammerschmidt and William F. Fitzgerald, Arch. Environ. Contam. Toxicol. 51(3):416-424 doi:10.1007/s00244-005-0265-7
- USGS Open-File Report 01-445 with modifications
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| BTHG |
not yet assigned |
Biological total mercury |
determined per analytical batch |
- sulphuric:nitric acid digestion
- dilute nitric acid digestion per "Bioaccumulation and Trophic Transfer of Methylmercury in Long Island Sound," 2006, Chad R. Hammerschmidt and William F. Fitzgerald, Arch. Environ. Contam. Toxicol. 51(3):416-424 doi:10.1007/s00244-005-0265-7
- EPA Method 7473 (SW-846) Rev. 0 - direct combustion
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