Cyanide (Free) Test Kits

Visual Kit

Range	MDL	Method	Type	Kit Cat. No.	Refill
0.00 - 0.10 & 0.1 - 1.0 ppm	0.005 ppm	Isonicotinic-Barbituric Acid	CHEMets	K-3810	R-3810

Instrumental Kit

Range	Method	Type	Kit Cat. No.
0 - 0.400 ppm	Isonicotinic-Barbituric Acid	Vacu-vials	K-3803

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 Isonicotinic-Barbituric Acid reagent 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 Isonicotinic-Barbituric Acid Method

In the Cyanide CHEMets® and Vacu-vials® Kit, chlorine is added to a sample that has been buffered to pH 6. The resulting cyanogen chloride reacts with isonicotinic and barbituric acids to form a blue colour. Results are expressed as ppm (mg/l) CN.

This chemistry provides two advantages over the more commonly used Pyridine methods:

The shelf life of the reagent is extended
The analyst is not exposed to noxious and hazardous Pyridine fumes

Reference:
S. Nagashima, Spectrophotometric Determination of Cyanide with Isonicotinic Acid and Barbituric Acid, International Journal of Environ. Anal. Chem., 1981, Vol. 10, pp. 99-106.

Applications

Cyanide is used in many chemical and refining processes. It is found in effluent from electroplating and metal cleaning operations, coke ovens, steel manufacturing facilities, and gas scrubbers. Low levels may occur naturally in groundwaters after it has passed through mineral deposits and rock strata. Although cyanide can be safely removed by alkaline chlorination, its acute toxicity to aquatic life necessitates routine monitoring of effluents. The Directive Prescribed Concentration or Value (PCV) for free cyanide in drinking water in the UK and Ireland is 50 µg/l (ppb).

CHEMetrics' cyanide test kits are applicable to the monitoring of effluents and surface water supplies. It is recommended, however, that the sample be distilled and hydrogen sulphide be removed prior to analysis.

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