Nitrite Test Kits

Visual & Titrimetric Kits

Range	MDL	Method	Type	Kit Cat. No.	Refill
0.0 - 2.5 ppm as N	0.2 ppm	Azo Dye Formation	CHEMets	K-7004	R-7002
0 - 80 ppm as N	4 ppm	Azo Dye Formation	VACUettes	K-7004D	R-7002D
0 - 170 ppm as N	10 ppm	Azo Dye Formation	VACUettes	K-7004A	R-7002A
0 - 300 ppm as N	20 ppm	Azo Dye Formation	VACUettes	K-7004B	R-7002B
0 - 3,000 ppm as N	200 ppm	Azo Dye Formation	VACUettes	K-7004C	R-7002C
250 - 2,500 ppm as NaNO₂	250 ppm	Ceric Sulphate Titrant w/Ferroin Indicator	Titrets	K-7025
500 - 5,000 ppm as NaNO₂	500 ppm	Ceric Sulphate Titrant w/Ferroin Indicator	Titrets	K-7050

Instrumental Kit

Range	Method	Type	Kit Cat. No.
0 - 1.00 ppm as N	Azo Dye Formation	Vacu-vials	K-7003

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

CHEMetrics offers test kits employing the well-known Azo Dye Formation and Ceric Sulphate Titrimetric Methods to deliver sensitivity and accuracy within two minutes or less. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.

The Azo Dye Formation Method

Nitrite diazotises with a primary aromatic amine in an acidic solution to produce a highly coloured azo dye. The intensity of the colour is directly proportional to the concentration of nitrite in the sample. Nitrate will not interfere. Results are expressed as ppm (mg/l) NO₂-N.

Reference:
APHA Standard Methods, 22^nd ed., Method 4500-NO₂¯ B- 2000. USEPA Methods for Chemical Analysis of Water and Wastes, Method 354.1 (1983).

The Ceric Sulphate Titrimetric Method

Ceric sulphate is the titrant and ferroin is the end point indicator. The method is free from glycol interference in samples that contain up to 75 % glycol, making it particularly applicable to systems that contain nitrite corrosion inhibitors. Results are expressed as ppm (mg/l) NaNO₂.

Reference:
Krom, Michael D., Spectrophotometric Determination of Ammonia: A Study of a Modified Berthelot Reduction Using Salicylate and Dichloroisocyanurate, The Analyst, v.105, pp. 305-316, 1980.

Applications

Nitrite, an intermediate in the nitrogen cycle, is formed during the decomposition of organic matter but readily oxidises to form nitrate. These processes occur in wastewater treatment plants, water distribution systems, and natural waters. Nitrites are useful as corrosion inhibitors, preservatives, pigments, and in manufacturing many organic preservative chemicals. Nitrite is a possible byproduct of the use of the disinfectant chloramine. The Directive Prescribed Concentration or Value (PCV) for nitrite in the UK is 0.5 mg/l (ppm) in drinking water supplies and 0.1 mg/l at water treatment works. The Prescribed Concentration or Value (PCV) for Ireland in drinking water supplies is the same.

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