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Cyanide |
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 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.
The Silver Nitrate Method
Reference: APHA Standard Methods, 20th ed., pp. 4-38, Method 4500-CN- D (1998).
CHEMetrics employs silver nitrate as the titrant and 5-(p-dimethylaminobenzylindene) rhodanine as the indicator. A color change from orange to yellow signals the end of the titration. Results are expressed as ppm (mg/L) CN. |
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| • Click to View MSDS and Kit instructions |
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 Visual Kits |
0-0.1 & 0.1-1 ppm
0.005 ppm / Method: Isonicotinic-Barbituric Acid |
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Cat# |
| CHEMets Kit |
K-3810 |
| | CHEMets Refill, 30 ampoules | R-3810 |
| | Neutralizer Solution Pack, six 20 mL bottles, Shelf-life 2 years | A-3800 |
| | Activator Solution Pack, six 10 mL bottles, Shelf-life 2 years | A-3801 |
| | 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. | |
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5-50 ppm
5.0 ppm / Method: Silver Nitrate |
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Cat# |
| Titrets Kit |
K-3815 |
| | Increments:
5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 9.0, 10.0, 12.5, 15.0, 17.5, 20.0, 25.0, 35.0, 50.0 ppm | |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules with valve assemblies, Indicator Solution, titrettor, 25 mL sample cup, instructions, and MSDS. | |
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 Instrumental Kits |
0.020-0.400 ppm
Isonicotinic-Barbituric Acid |
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Cat# |
| Vacu-vials Kit |
K-3803 |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules, Neutralizer Solution1, Activator Solution1, 25 mL sample cup, 3.0 mL syringe, ampoule blank, instructions, calibration table, and MSDS. | |
| | Kit didatangkan di dalam kotak kadbod dan mengandungi semua keperluan untuk melakukan 30 ujian: tigapuluh ampul, Larutan1 Penutral, Larutan1 Pengaktif, cawan sampel 25mL, picagari 3.0mL, blank ampul, arahan, jadual penentukuran dan MSDS.
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Kit Components common to Cyanide |
| Description |
Cat# |
| | Sample Cup Pack , 25 mL (6 ea) | A-0013 |
| | Ampoule Blank Pack (5 ea) | A-0023 |
| | Titrettor Pack (1 ea) | A-0053 |
| | Syringe Pack, 3.0 mL (6 ea) | A-0063 |
| | Sample Cup & Top Pack, 5 mL (6 ea) | A-0105 |
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