U.S. Geological Survey - Standard Reference Sample Project
Results of the Spring 2004 Inter-laboratory Comparison

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Method codes, abbreviations, symbols, formulas

List of participating laboratories

Sample preparation

Statistics and ratings

Most probable values (MPVs)

Overall laboratory performance ratings

Sample statistics:
| Trace (T-177) | Major (M-170) | Nutrient (N-81) | Nutrient (N-82) | Precip (P-42) | Mercury (Hg-38) |

(Note: Some of these links take a while to load)

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