Nitrate Test Kits

Visual Kits

Range MDL Method Kit Catalog No. Refill Catalog No.
0-3.4 ppm as N 0.3 ppm Zinc Reduction K-6905 R-6905
0-4.5 ppm as N 0.4 ppm Cadmium Reduction K-6904 R-6902
0-45 ppm as N 4 ppm Cadmium Reduction K-6909D R-6904
0-225 ppm as N 20 ppm Cadmium Reduction K-6909A R-6904
0-675 ppm as N 60 ppm Cadmium Reduction K-6909B R-6909
0-2700 ppm as N 240 ppm Cadmium Reduction K-6909C R-6909

Instrumental Kits

Range Method Kit Catalog No.
0-1.50 ppm as N Zinc Reduction K-6913
0-1.50 ppm as N Cadmium Reduction K-6903
0-7.50 ppm as N Cadmium Reduction K-6923
0-50.0 ppm as NO₃ Cadmium Reduction K-6933

Methods

 

Nitrate is the most completely oxidized form of nitrogen. It is formed during the final stages of biological decomposition, either in wastewater treatment facilities or in natural water supplies. Low-level nitrate concentrations may be present in natural waters. However, a Maximum Contaminant Level of 10 ppm nitrate-nitrogen has been established for drinking water by the USEPA.

 

The Cadmium Reduction Method

 

References: ASTM D 3867-09, Nitrate-Nitrite in Water, Test Method B. APHA Standard Methods, 22nd ed., Method 4500-NO3- E -2000. USEPA Methods for Chemical Analysis of Water and Wastes, Method 353.3 (1983).

 

Nitrate is reduced to nitrite using cadmium as the reducing agent. The resulting nitrite concentration is then determined colorimetrically. This method is applicable to drinking and surface waters, as well as domestic and industrial wastes. Nitrite will interfere with this test. Results are expressed as ppm (mg/L) NO3-N or NO3.

 

The Zinc Reduction Method

 

References: ASTM D 3867-09, Nitrate-Nitrite in Water, Test Method B. APHA Standard Methods, 22nd ed., Method 4500-NO3- E -2000. USEPA Methods for Chemical Analysis of Water and Wastes, Method 353.3 (1983). Nelson, J.L., Kurtz, L.T., and R.H. Bray, Rapid Determination of Nitrates and Nitrites. Anal. Chem., V26, p. 1081-1082, (1954).

 

Nitrate is reduced to nitrite using zinc as the reducing agent. The resulting nitrite concentration is then determined colorimetrically. This method is applicable to industrial wastewaters, drinking, and surface waters. These test kits can also be used for the analysis of seawater. This method will measure nitrate in the presence of low levels of nitrite (by difference). Results are expressed as ppm (mg/L) NO3-N.