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Water Talk

Manganese Testing

Hello. I use the HACH low range PAN method for testing manganese. What's the best way to get rid of the sample waste? It contains cyanide, and I don't want to just dump it down the sink.

1 Comments

  1. Stephen Olson

    Jan. 12, 2016

    We usually collect the waste in a container. Then, we add caustic (KOH or NaOH) to bring the pH up above 10, then bleach (5 to 10 mg/L). We let it react for about half an hour to destroy the cyanide. Afterwards, it's safe for the sewer.

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