USGS

Sources, Instream Transport, and Trends of Nitrogen, Phosphorus, and Sediment in the Lower Tennessee River Basin, 1980-96

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
code

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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