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.