Cyanide (free)
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Methods Visual Kits
Cyanide is used in many chemical and refining Range: 0-0.1 & 0.1-1 ppm
processes. It is found in effluent from electroplating
MDL: 0.005 ppm / Method: Isonicotinic-Barbituric Acid
and metal cleaning operations, coke ovens, steel
Cat#
manufacturing facilities, and gas scrubbers. Although
CHEMets Kit K-3810
cyanide can be safely removed by alkaline chlorina-
CHEMets Refill, 30 ampoules R-3810
tion, its acute toxicity to aquatic life necessitates
Neutralizer Solution Pack, six 20 mL bottles, Shelf-life 2 years A-3800
1
routine monitoring of effluents. The Maximum
Activator Solution Pack, six 10 mL bottles, Shelf-life 8 months A-3801
1
Contaminant Level for free cyanide in drinking water
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
is 0.2 mg/L.
High Range Comparator, Shelf-life 2 years:
CHEMetrics’ cyanide test kits are applicable to the 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 1.0 ppm C-3810
monitoring of effluents and surface water supplies. It Kit comes in a plastic case and contains everything needed to perform 30
is recommended, however, that the sample be distilled
tests: Refill, Low and High Range Comparators, Neutralizer Solution, Activator
Solution, 5 mL sample cup & top, instructions, and MSDS.
and hydrogen sulfide be removed prior to analysis.
Range: 5-50 ppm
The Isonicotinic-Barbituric Acid Method MDL: 5.0 ppm / Method: Silver Nitrate
Reference: S. Nagashima, Spectrophotometric
Cat#
Determination of Cyanide with Isonicotinic Acid and
Titrets Kit K-3815
Barbituric Acid, International Journal of Environ. Anal.
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,
Chem., 1981, Vol. 10, pp. 99-106. 20.0, 25.0, 35.0, 50.0 ppm
With CHEMetrics’ method based on the
Kit comes in a cardboard box and contains everything needed to perform 30
tests: thirty ampoules with valve assemblies, Indicator Solution, titrettor,
isonicotinic/barbituric acid procedure, chlorine is 25 mL sample cup, instructions, and MSDS.
added to a sample that has been buffered to pH 6.
The resulting cyanogen chloride reacts with isonico-
tinic and barbituric acids to form a blue color. Results
Instrumental Kits
are expressed as ppm (mg/L) CN.
This chemistry provides two advantages over the
V-2000 Multi-Analyte Photometer
more commonly used pyridine methods: (1) The shelf-
(See page 12 for instrumental features)
life of the reagent is extended, and (2) the analyst is
not exposed to noxious and hazardous fumes from Range: 0.020-0.400 ppm
the pyridine reagent.
Method: Isonicotinic-Barbituric Acid
Cat#
The Silver Nitrate Method
Vacu-vials Kit, Shelf-life 8 months K-3803
Kit comes in a cardboard box and contains everything needed to perform 30
Reference: APHA Standard Methods, 20
th
ed., pp. 4-
tests: thirty ampoules, Neutralizer Solution, Activator Solution, 25 mL sample
cup, 3.0 mL syringe, ampoule blank, instructions, calibration table, and MSDS.
38, Method 4500-CN
-
D (1998).
CHEMetrics employs silver nitrate as the titrant and
Vacu-vials Kits require the use of the V-2000 Photometer or a
spectrophotometer capable of accepting a 13 mm diameter round cell.
5-(p-dimethylaminobenzylindene) rhodanine as the
Instrument sold separately.
indicator. A color change from orange to yellow
signals the end of the titration. Results are expressed
Kit Components common to Cyanide
as ppm (mg/L) CN.
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
1
The accessory pack supplies enough solution to perform at least
200 tests.
Instructions are posted on our website.
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