3.1. Flow rate test.The minimum flow rate required to maintain a formalin treatment concentration of.1500 ~ 1 1-L f 10% for a 15 min exposure was 7.6 1 min - '(Fig. 1). Flow rates of 1.0.And 3.8 1 min - 'did not produce or maintain the desired treatment concentration over the.15 min exposure period. Formalin concentrations peaked at 1020 ~ 1 1-L (sample time.25 min) and 1339 ~ 1 1-L (sample time 15 min) in the 1.0 and 3.8 1 min - ', flow ratesRespectively and were, slowly diluted out of the system over the remaining 60 min.Sampling period. In the 7.6 and 15.1 1 min - ', flow exposures formalin treatment.Concentrations of 1500 ~ 1 1-L were maintained for at least 10 min of the 15 min.Exposure periods. The formalin concentration reached approximately 1400 ~ 1 L - within. '5 min in these tests and was maintained for at least 10 min. The concentration had.Decreased sharply to 160 ~ 1 1-L at the 20 min sample time and the remaining traces of.Formalin were quickly flushed from the system. The mean relative standard deviation of.The triplicate water samples withdrawn, at 5 10 and 15, min into the treatment was 4.9%.+ 7.3. We feel that this validated the precision of the sampling technique.
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