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Reaction of cyanide and bleach?

2006

What is the reaction of free cyanide and bleach?

What is the ratio that is needed for bleach molecules to destruct cyanide molecules?

Can anyone post the equation showing this reaction?

Carolina Bruce

2006

As we undertake silver cyanide plating I hope the following helps as cyanide oxidation can be viewed as 3 reactions.

1. CN- + OCL- +H2O = CNCL + 2 OH-
Here free cyanide is converted to cyanogen chloride a highly toxic but short-lived species not released from solution.

2. CNCL + 2OH- = CNO- (cyanate) + CL- + H2O
3. 2CNO- + 3 OCL- + H2O = 2CO2 + N2 + 2OH- + 3CL-
Reactions 1 and 2 are fast at around 2 mins to occur, reaction 3 takes about 1 hr depending on pH.

Best wishes.

Nigel Gill, BSc MIMF MRSC

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