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

Note: Click on the ‘Kit Cat. No.’ to view the test instructions. Click on the ‘Range’ value for Vacu-vials to view accuracy chart.

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 wastewater 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 wastewaters, 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 wastewaters, drinking, and surface waters, and sea-water.

References:
ASTM D 3867-09, Nitrate-Nitrite in Water, Test Method B.
APHA Standard Methods, 22^nd 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.

Applications

Nitrate is the most completely oxidised form of nitrogen, formed during the final stages of biological decomposition, either in wastewater treatment facilities or in natural water supplies. Low-level nitrate concentration may be present in natural waters. Inorganic fertilisers from farmland run off are the primary source of nitrate in drinking water. Elevated levels in drinking water may be carcinogenic. The Directive Prescribed Concentration or Value (PCV) for free Nitrate in drinking water in the UK and Ireland is 50 mg/l (ppm) (11.3 ppm as N).

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