AWWA WQTC71339

This paper reports on an assessment performed to evaluate instruments that are currently being used by water utilities which are based on the amperometric electrochemical method. The assessment was conducted to determine if on-line monitors being used by utilities provided data comparable to data collected by instruments that utilize the N, N-diethyl-p-phenylenediamine (DPD) method, that is by the method approved by the U.S. Environmental Protection Agency. This work was completed for AWWA as part of the WITAF program. Includes figure.