Dear Fine People: The precipitant we use in our industrial wastewater treatment plant to remove chelated metals from our rinse waters is dithiocarbamate, or DTC. DTC has the unfortunate ability to form the undesirable (read: strictly regulated) byproduct/decomposition product CS2 (carbon disulfide), especially under acidic conditions. Can anyone offer help in any of the following areas regarding this dilemma? 1. DTC management to minimize/eliminate CS2 formation? Preventing DTC bearing waters from experiencing acidic conditions seems to be one of the more obvious interventions. 2. DTC variants which cannot form CS2 (if they exist)? 3. Alternatives to DTC? We have tried several, none seems to match DTC's ability to precipitate a highly chelated, high lead bearing wastewater stream to under 0.2 ppm lead consistently. 4. Easy test kit/method for CS2? Thanks for your help Keith Perrin, Compliance Specialist Printed Circuit Corp.