Scientific Investigations Report 2007–5179
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5179
Table 3. Long-term method detection and censoring limits used during data analyses for this regional study.
[Censoring limit: maximum censored value contained in data set (LRL). Long-term MDLs: dates in parentheses are those for which the long-term MDLs were available. Abbreviations: LRL, laboratory reporting limit; MDL, method detection level; N, nitrogen; P, phosphorus; mg/L, milligram per liter; µg/L, microgram per liter]
| Constituent (filtered) |
Censoring limit |
Long-term MDLs |
|---|---|---|
| Nitrogen species, in mg/L as N | ||
| Ammonia | 0.041 | 0.005–0.024(1999–Present) |
| Kjeldahl (ammonia + organic) nitrogen | 0.2 | 0.05(1998–Present) |
| Nitrite | 0.01 | 0.001–0.004(2000–Present) |
| Nitrite + nitrate (nitrate) | 0.1 | 0.009–0.03(1999–Present) |
| Phosphorus species, in mg/L as P | ||
| Total phosphorus | 0.01 | 0.0018–0.03(1998–Present) |
| Orthophosphorus | 0.01 | 0.003–0.009(2000–Present) |
| Organic compounds, in µg/L | ||
| Pesticides | None | 0.001–0.021(1980–Present) |
| Volatile-organic compounds | 0.2 | 0.015–0.91(1980–Present) |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5179
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