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topic 10164

DTC metal precipitant: molar ratio


I am looking for the theoretical molar ratio of DTC (Sodium dimethyldithiocarbamate) to precipitate Ni, Cu and Fe. Anyone is aware of the needed theoretical dosages? If by any chance you have the ones for other transition metals, you are very welcome to post them.

Mario Drapeau
- McWatters, Quebec, Canada


I believe it is 1:1, since the molecule acts as a trap for the metal.

Since you are only using it to scavenge 1 or 2 parts per million, it sometimes may be cost effective.

tom pullizzi monitor
Tom Pullizzi
Falls Township,


Yes, 1:1 for monovalent metals. But 2:1 for divalent metals, etc. The practicality of the situation, though, is that you probably won't be able to hold the addition to the stochiometric ratio, and will probably have to feed several times as much as you think you need.

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey


For Sodium Dimethyldithiocarbamate application in metal precipitation, the manufacturer can answer your question.

Dennis Wong
Air & Water Purification Equipment Co. Ltd. - Hong Kong

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