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View Actual EPA Method 353.2 (PDF File)
EPA Method 353.2:Nitrate-Nitrite Nitrogen by Colorimetry. Official Name: Nitrogen, Nitrate-Nitrite (Colorimetric, Automated, Cadmium Reduction)
Summary:A filtered sample is passed through a column containing granulated copper-cadmium to reduce nitrate to nitrite. The nitrite (that originally present plus that reduced to nitrate) is determined by diazotizing with sulfanilamide and coupling with N-(1-naphthyl)-ethylenediamine dihydrochloride to form a highly colored azo dye which is measured colorimetrically. Separate, rather than combined nitrate-nitrite, values are readily obtained by carrying out the procedure first with, and then without, the Cu-Cd reduction step.
Scope:This method pertains to the determination of nitrite singly, or nitrite and nitrate combined in surface and saline waters; and domestic and industrial wastes.
Citation:Methods for the Determination of Inorganic Substances in Environmental Samples (EPA/600/R-93/100)
Interferences:(1) Build up of suspended matter in the reduction column will restrict sample flow. Since nitrate-nitrogen is found in a soluble state, the sample may be pre-filtered.(2) High concentrations of iron, copper, or other metals.(3) Large concentrations of oil and grease will coat the surface of the cadmium.
QC Requirements:Not included.
Maximum Holding Time:28 Days (nitrate+nitrite)48 hours (nitrate or nitrite, singly)(MCAWW, Table 1).
Media:WATER
Subcategory:Inorganic
Concentration:0.05 - 10 mg/L
Precision:Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.
Detection:The lowest level of detection was taken from the lowest end of the range specified in the method.
Revision Number:Revision 2.0, August 1993
Test Description:Nitrate-Nitrate by A
Report Number:600/R-93-100
Instrument used for this test:FIA