EPA Method 353.1


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EPA Method 353.1:
Nitrate-Nitrite by Colorimetry. Official Name: Nitrogen, Nitrate-Nitrite (Colorimetric, Automated Hydrazine Reduction)

Summary:
Nitrate in a sample is reduced to nitrite using hydrazine sulfate and the nitrite in the sample (originally present plus reduced 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. This automated procedure can measure approximately 20 samples per hour.

Scope:
This method determines nitrate and nitrite in drinking and surface water; domestic and industrial wastes.

Citation:
Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

Interferences:
(A) Color: Sample color that absorbs in the range used for analysis will interfere.(B) Sulfide: Nitrate and nitrite concentrations can vary up to 10% with concentration of sulfide ions up to 10 mg/L.

QC Requirements:
None.

Maximum Holding Time:
28 Days (nitrate+nitrite)(MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.01 - 10 mg/L nitrate-nitrite nitrogen

Sample Prep:
None.

Precision:
Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.

Detection:
None.

Revision Number:
Issued 1971; Reissued with Revision 1978

Test Description:
Total Inorganic Nitrogen (Calc)

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Examples:  8260
TO-15

Examples:  Dioxin
Mercury
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