Cyanide (Free) Test Kits
|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|
|Range||Method||Type||Kit Cat. No.|
|0 - 0.400 ppm||Isonicotinic-Barbituric Acid||Vacu-vials||K-3803|
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 color. 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
S. Nagashima, Spectrophotometric Determination of Cyanide with Isonicotinic Acid and Barbituric Acid, International Journal of Environ. Anal. Chem., 1981, Vol. 10, pp. 99-106.
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 Prescribed Concentration or Value (PCV) for free cyanide in drinking water in the UK is 50 µg/l (ppb). The Parametric Value for Ireland is the same.
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.