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Chlorine analysis

I have an industry rep who needs help with the following question.  Any
assistance is greatly appreciated.

Here is the question  -----

Do you or others have experience with the Total Residual and Free
Chlorine analyses for samples in a salt-water matrix ?  We are
interested in interences and if the methods give over- or underestimated

concentrations.  Also, for chlorine analyses in salt-water matrices, is
there a preferred method -- either the amperometric or DPD-colorimetric

Judy Jakobsen
SCWA P2 Program