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Cyanide Test Strips 1-30 ppm EM Quant (1 PK of 100) HAZMAT fee incl

10044
$285.39
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Cyanide Test Strips 1-30 ppm EM Quant  (1 PK of 100) HAZMAT fee incl MAIN
MSDS (Material Safety Data Sheet)

EM Quant® Cyanide Test, Catalog No. 10044

Test strips and reagent for the detection and semi-quantitative determination of cyanide ions

General

The EM Quant® Cyanide Test is a rapid semi-quantitative exploratory test for cyanide ions in effluent, e.g. from electroplating works. It can be used directly to monitor cyanide waste treatment plant. Only readily dissociable cyanides are detected.

The use of hypochlorite as a means of detoxifying cyanide-bearing effluent is a well-proven, economical procedure that is employed on a large scale. 12% sodium hypochlorite bleaching solution or chlorine and sodium hydroxide solution are used to convert cyanide to cyanate, which is slowly hydrolyzed to ammonium carbonate.

Oxygen is not directly transferred from the hypochlorite to the cyanide. Initially cyanogen chloride (CICN) is formed. This is just as toxic as hydrogen cyanide (HCN) and only sparingly water-soluble:

CN + OCl + H2O --> CICN + 2 OH

The rate at which cyanogen chloride is hydrolyzed to cyanate is strongly pH-dependent. It is only sufficiently swift at pH values exceeding 12:

CICN + 2 OH --> OCN + Cl+ + H2O

The cyanate is then hydrolyzed to ammonium carbonate:

OCN + 2 H2O --> CO32– + HN4+

or, if there is an excess of hypochlorite, it is oxidized at an acid pH to nitrogen and CO2:

2 OCN + 3 OCl + 2 H+ --> N2 + 2 CO2 + 3 Cl + H2O

Principle of the Method

Cyanide ions react with chlorine to form cyanogen chloride, which breaks open the ring of pyridine to give glutacondialdehyde. The barbituric acid derivative in the reaction zone of the test strip reacts with the dialdehyde to produce a red polymethine dye. The pH is optimized through addition of a buffer mixture.

Graduation

0 -1 -3 -10 -30mg/l (ppm)CN

Directions

  1. Rinse the measuring vessel several times with some of the sample and fill to the 5 ml mark.
  2. Determine the pH (e.g. with pH indicator strips).
  3. If the pH is greater than 9, add 25% sulfuric acid dropwise to adjust to pH 6-7.
  4. Add one level measuring spoon of reagent 1 (buffer mixture) and dissolve.
  5. Add 5 drops of cyanide reagent 2 and shake.
  6. Immediately immerse the reaction zone in the solution for 30 seconds.
  7. Remove the test strip, wipe off excess liquid by stroking the edge of the strip against the rim of the vessel and compare the reaction zone with the color scale within 10 seconds.

Safety Precautions

Keep reagent 2 (contains chloramine T and pyridine) away from the skin. In the event of contact, rinse well immediately with plenty of water. Seek immediate medical attention if substance enters the eye.

Interference

Complexed cyanides and cyanides of copper, palladium, mercury and silver give low readings or are not detected at all. Other free cations commonly found in waste water do not interfere, even at concentrations of up to 1000 mg/l (ppm). This has been established in tests conducted up to this concentration limit.

The most important interfering anion is thiocyanate, which gives a similar color to cyanide when present in concentrations above 1mg/l (ppm).

If 5-10mg/l (ppm) of bromide or iodide are present, the coloration is weaker or absent altogether.

At concentrations of 50mg/l (ppm), nitrite slightly intensifies the color while permanganate and chromate reduce its intensity.

Strong reducing agents can interfere if they react completely or partially with the chlorine in the reagent added (sulfide does not interfere in a concentration of 100mg/l (ppm)).

In strongly acidic or alkaline solutions interference may occur if the buffer added does not have sufficient buffering capacity. This is why it is important to adjust to pH 6-7 if the water is too acidic or alkaline.

Examples: to a test solution equivalent to 4% sodium hydroxide solution add approximately 0.8ml of 25% sulfuric acid to optimize the pH. For a test solution equivalent to 10% sodium hydroxide solution approximately 2ml of 25% sulfuric acid is required. The increased volume results in a slightly lower value than the color scale would normally show.

Standard (1000 mg/l)

Dissolve 0.25 g of potassium cyanide in 100 ml of distilled water and stabilize with 1 drop of 20% sodium hydroxide solution.

Package Size

10044 EM Quant® Cyanide Test

Cyanide Test for 100 determinations, strips and reagents included.



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