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Table 2

Laboratory analytical methods and reporting limits

PollutantPollutant nameAnalytical methodReporting limit (mg/L)
NO2,3-N Nitrate – Nitrite Nitrogen SM 4500 NO3 Fa 0.0056 
TKN Total Kjeldahl Nitrogen EPA Method 351.2b 0.28 
TAN Total Ammonia Nitrogen SM 4500 NH3 Ga 0.007 
ON Organic Nitrogen = TKN – TAN NA 
TN Total Nitrogen = TKN + NO2,3-N NA 
OP Orthophosphate SM 4500 P Fa 0.006 
TP Total Phosphorus SM 4500 P Fa 0.01 
PBP Particle Bound Phosphorus = TP – OP NA 
TSS Total Suspended Solids SM 2540 Da 
PollutantPollutant nameAnalytical methodReporting limit (mg/L)
NO2,3-N Nitrate – Nitrite Nitrogen SM 4500 NO3 Fa 0.0056 
TKN Total Kjeldahl Nitrogen EPA Method 351.2b 0.28 
TAN Total Ammonia Nitrogen SM 4500 NH3 Ga 0.007 
ON Organic Nitrogen = TKN – TAN NA 
TN Total Nitrogen = TKN + NO2,3-N NA 
OP Orthophosphate SM 4500 P Fa 0.006 
TP Total Phosphorus SM 4500 P Fa 0.01 
PBP Particle Bound Phosphorus = TP – OP NA 
TSS Total Suspended Solids SM 2540 Da 

aAPHA et al. (2012).

bUS EPA (1983).

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