Nitrate Test Kits

Visual Kits

Range MDL Method Type Kit Cat. No. Refill No.
0-3.4 ppm as N 0.3 ppm Zinc Reduction CHEMets K-6905 R-6905
0-4.5 ppm as N 0.4 ppm Cadmium Reduction CHEMets K-6904 R-6902
0-45 ppm as N 4 ppm Cadmium Reduction CHEMets K-6909D R-6904
0-225 ppm as N 20 ppm Cadmium Reduction CHEMets K-6909A R-6904
0-675 ppm as N 60 ppm Cadmium Reduction CHEMets K-6909B R-6909
0-2,700 ppm as N 240 ppm Cadmium Reduction CHEMets K-6909C R-6909

Instrumental Kits

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

The CHEMetrics test kits for the determination of Nitrate in aqueous solutions are based on patented Self-Filling Reagent Ampoule technology, and employ zinc reduction and cadmium reduction methods, delivering sensitivity and accuracy within two minutes or less. The Zinc reduction method is cadmium-free and simplifies disposal procedures. Premixed. Premeasured. Precise. Each kit contains 30 tests. Suitable for potable, surface and sea-water as well as industrial waste water testing.

The Zinc Reduction Method (Cadmium Free)

Nitrate is reduced to nitrite using Zinc as the reducing agent. The resulting nitrite concentration is then determined colourimetrically. Nitrate concentrations can also be determined in the presence of low levels of nitrite (by difference). Results are expressed as ppm (mg/l) N (NO3-N).

The benefit of the Zinc Reduction chemistry is that it is resistant to chloride interference, and is suitable for testing sea-water and brines; and also does not contain the heavy metal Cadmium, simplifying disposal procedures. This test method is applicable to industrial waste waters, drinking water, surface waters and sea-water. The test kit is based on the patented CHEMetrics Self-Filling Reagent Ampoule technology.

This new visual colourimetric test kit's test method is applicable to industrial waste waters, drinking, and surface waters, and sea-water.

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).

The Cadmium Reduction Method

Nitrate is reduced to nitrite using cadmium as the reducing agent. The resulting nitrite concentration is then determined colourimetrically. 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.

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).

Applications

Nitrate is the most completely oxidised form of nitrogen, formed during the final stages of biological decomposition, either in waste water treatment facilities or in natural water supplies. Low-level nitrate concentration may be present in natural waters. Elevated levels in drinking water may be carcinogenic. EU Drinking Water Directive has set a maximum concentration of 50 ppm NO3 (11.3 ppm as N).


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