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CHEMets Cyanide Visual Method
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CHEMets Cyanide Free Visual Method
The CHEMets Method To perform a test, immerse the CHEMet ampoule into the sample and snap off the tip (Step 1)- the correct volume of sample is automatically drawn in, filling the ampoule; a small inert gas bubble remains in the ampoule. To facilitate mixing the sample and reagent, tilt the ampoule back and forth so the bubble travels from end to end (Step 2). In 2 minutes or less, quantify the result by comparing the filled ampoule to the appropriate color standard(s) (Step 3). For higher concentrations, the flat comparator is used. For lower concentrations, the round comparator is used. The ampoule is compared with the standards until a color match is found. Kits include 30 ampoules, comparator(s), accessory solution(s)(when necessary), a sample cup, and instructions. Refill packs of 30 ampoules and accessory solutions are available separately. Comparators have a 2-year shelflife. Material Safety Data Sheets are provided in test kits. CHEMets ampoules are designed for maximum simplicity and accuracy. Each glass ampoule is 7 mm in diameter, 100 mm in length, with a tapered, pre-scored tip; reagents are vacuum-sealed inside.
Product Description
Methods
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. Although cyanide can be safely removed by alkaline chlorination, its acute toxicity to aquatic life necessitates routine monitoring of effluents.
The Maximum Contaminant Level for free cyanide in drinking water is 0.2 mg/L.
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 sulfide be removed prior to analysis.
The Isonicotinic-Barbituric Acid Method
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. With CHEMetrics' method based on the isonicotinic/barbituric acid procedure, 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: (1) The shelflife of the reagent is extended, and (2) the analyst is not exposed to noxious and hazardous fumes from the pyridine reagent.
Visual Kits
Range: 0-0.1 & 0.1-1 ppm
MDL: 0.005 ppm / Method: Isonicotinic-Barbituric Acid
Cat# CHEMets Kit K-3810
CHEMets Refill, 30 ampoules R-3810
Neutralizer Solution Pack, six 20 mL bottles, Shelf-life 2 years A-38001
Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years A-38011
Low Range Comparator, Shelf-life 2 years: 0, 0.01, 0.02, 0.03, 0.04, 0.06, 0.08, 0.10 ppm C-3801
High Range Comparator, Shelf-life 2 years: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 1.0 ppm C-3810
Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Low and High Range Comparators, Neutralizer Solution, Activator Solution, 5 mL sample cup & top, instructions, and MSDS.