Table 2. Summary of procedures used to combine nutrient constituent data from different analytical methods
[Modified from Frick and others, 1996; mg/L, milligrams per liter; N, nitrogen; P, phosphorus]
|
Nutrient constituent |
Parameter from source data bases |
Procedure |
Load-computation sites for which parameter was used (see Appendix A for detailed site description) |
|
|---|---|---|---|---|
|
Parameter |
Parameter name |
|||
|
Total nitrite plus nitrate, as N |
00630 |
Nitrogen, nitrite plus nitrate, total (mg/L as N) |
Use if available |
All sites except 2, 14, 16, 17 |
|
|
00631 |
Nitrogen, nitrite plus nitrate, dissolved (mg/L as N) |
Use if 00630 not available |
2, 14, 16, 17 |
|
Total ammonia, as N |
00610 |
Nitrogen, ammonia, total (mg/L as N) |
Use if available |
All sites except 11, 16, 18 |
|
|
00608 |
Nitrogen, ammonia, dissolved (mg/L as N) |
Use if 00610 not available |
11, 16, 18 |
|
Total ammonia plus organic nitrogen, as N |
00625 |
Nitrogen, ammonia plus organic, total (mg/L as N) |
Use if available |
2, 11,12,14,16,17 |
|
|
00635 |
Nitrogen, ammonia plus organic, single determination (mg/L as N) |
Use if 00625 not available |
4, 5, 7, 9, 13, 18 |
|
|
00605+00610 |
Nitrogen, organic, total (mg/L as N) + total ammonia, as Na |
Use if 00625 and 00635 not available |
1, 6, 10, 15 |
|
Total nitrogen, as N |
00600 |
Nitrogen, total (mg/L as N) |
Use if available |
Not used at any sites (not consistently populated) |
|
|
[total nitrite plus nitrate, as N] + [total ammonia plus organic nitrogen, as N]a |
Use if 00600 not available |
All sites |
|
|
Total phosphorus, as P |
00665 |
Phosphorus, total (mg/L as P) |
Use if available |
All sites |
|
Dissolved orthophosphorus, as P |
00671 |
Phosphorus, orthophosphate, dissolved (mg/L as P) |
Use if available |
All sites except 6, 10 |
|
|
00666 |
Phosphorus, dissolved (mg/L as P) |
Use if 00671 not available |
6, 10 |
a Nutrient constituent derived from another combination procedure.
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