Be clear about what you are measuring.
Product concentration, application dose, and residual measured at a specific point in water are different concepts. Before interpreting a value, know where and when the sample was taken.
The method must suit the sample.
The instrument range, method selectivity, and possible interferences should be evaluated together. The measurement plan should be based on the instrument manufacturer’s method and qualified laboratory guidance.
Traceable records, not a single number
Recording the sampling point, time, process conditions, and method used in the same record supports more meaningful comparison of results.
Monitoring scope depends on the application.
A chlorine dioxide value alone may not be sufficient. Depending on the application objective, by-products and other water quality parameters may also need to be included in the control plan. This article is not an analytical method or dilution instruction.
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