Letter 107

Solubilities of DTC metal precipitates

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I am interested in finding the solubilities of heavy metals in the presence of DTC, particulary trivalent chromium, silver, selenium and tin. I understand that the metal precipiates formed in the presence of DTC are NOT sulfides, so it is reasonable to assume the solubility of the precipitates differs from that of the corresponding metal sulfide salts. Chemical vendors that I am working with have not offered solubility data or stated what can be achieved with DTC and similar organic sulfide chemistries.

Robert D. Edelman - Environmental/Process Engineer
- Bedford, MA

"Heavy Metal Removal Using Dithiocarbamates" by R.E. Wing and W.E. Rayford (P&SF, Jan. '82) has some useful data too.

Ironically, Tom Pullizzi and I were involved just this month in a treatability analysis for nickel mixed with a soak cleaner, and we found sulfides and DTC worthless for this particular mix. Low pH chelate-breaking was the only thing that worked.

 
Ted Mooney, P.E.
Finishing.com Inc. - Brick, NJ

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