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Spot test for cyanide in waste water

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Q. What is the spot test for cyanide after treatment in ETP

Rathin Mukhopadhyay
- Kolkata, West Bengal, India
December 12, 2024

A. Hi Rathin

I am not aware of a direct spot test for cyanide. However, there is such a thing as "cyanide amenable to chlorination", which is the worst type of cyanide. And a spot test which is done constantly is the potassium iodide starch paper test; it doesn't actually test for cyanide, but it tests for the availability of chlorine -- the assumption being that if it is lightly purple there is a proper amount of chlorine so cyanide amenable to chlorination is not present.

Luck & Regards,

Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.

A. Hello, Rathin,

I use a Macherey-Nagel rapid test called "Cyantesmo", give it a look ⇨

Regards,

Pedro Franco
Chemical Engineer - Nova Friburgo, Rio de Janeiro, Brazil

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