Scientific Investigations Report 2006–5101–D
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5101–D
Table A7. Water-chemistry variables.
[Abbreviations: DO, dissolved oxygen; N, nitrogen; P, phosphorus; SPMD, semipermeable membrane device; AFDM, ash-free dry mass; TEQ, toxic equivalent; mg/L, milligram per liter; mg/m2, milligram per square meter; µS/cm, microsiemens per centimeter at 25 degrees Celsius; g/mi2, gram per square meter]
| Description | Variable code | Definition |
|---|---|---|
| Instantaneous summer DO (mg/L) | DISSOX | Dissolved oxygen, water, unfiltered (mg/L) |
| Summer chlorophyll AFDM | NAI | National Water-Quality Assessment Program Autotrophic Index = chlorophyll a (mg/m2) divided by ash-free dry mass (g/m2) |
| Average dissolved organic carbon | DISORGC | Organic carbon, water, filtered (mg/L) average of spring and summer samplings |
| Specific conductance | SPCOND | Specific conductance, water, unfiltered (µS/cm) |
| Average total suspended sediment | SUSSED | Suspended sediment concentration (mg/L) average of spring and summer samplings |
| Average sulfate concentration | SULFA | Sulfate, water, filtered (mg/L) average of spring and summer samplings |
| Average total nitrogen | TOTALN | Total nitrogen, water, unfiltered (mg/L as N) average of spring and summer samplings |
| Average total phosphorus | TOTALP | Phosphorus, water, unfiltered (mg/L as P) average of spring and summer samplings |
| Total insecticides (spring + summer) | NUMI | Number of insecticides detected summed for spring and summer samplings |
| Total pesticides (spring + summer) | NUMP | Number of pesticides detected summed for spring and summer samplings |
| Pesticide Toxicity Index (spring + summer) | PTIINV | Pesticide Toxicity Index for benthic invertebrates summed for spring and summer samplings |
| TEQ (SPMD) | SPMDTEQ | SPMD toxicity, CYP1A1 production (toxic equivalents) |
| Pyrene Index (SPMD) | SPMDUV | SPMD toxicity, ultraviolet fluourescence (micrograms pyrene) |
U.S. Department of the Interior | U.S. Geological Survey
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