EPA Method 354.1

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EPA Method 354.1:
Nitrite by Spectrophotometry. Official Name: Nitrogen, Nitrite (Spectrophotometric)

Summary:
The diazonium compound formed by diazotation of sulfanilamide by nitrite in water under acid conditions is coupled with N-(1-naphthyl)-ethylenediamine dihydrochloride to produce a reddish-purple color which is read in a spectrophotometer.

Scope:
This method determines nitrite in drinking, surface and saline waters; domestic and industrial wastes.

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

Interferences:
(A) Oxidants and Reductants: Oxidants and reductants affect nitrite concentrations.(B) High alkalinity: Alkalinty > 600 mg/L will give low results due to a shift in pH.

QC Requirements:
None.

Maximum Holding Time:
48 hours (MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.01 - 1.0 mg/L

Precision:
Precision and accuracy data are not available.

Detection:
-

Revision Number:
Issued 1971

Test Description:
Nitrate (as Nitrogen

Report Number:
600/4-79-020