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An evaluation of five commercially available test‐kit procedures that measure free available chlorine has been conducted on both synthetic water and five natural waters. Results indicate that the syringaldazine (liquid) procedure is the only test that exhibits absolute specificity for free available chlorine and the N,N‐diethyl‐p‐phenylene diamine procedure is the most accurate and precise.
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Guter et al. (1974) studied this question.
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