Quantitative Analysis Of Free Chlorine

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Article: Quantitative Analysis Of Free Chlorine

The determination of free chlorine content is applicable when testing for residual free chlorine(s) (hypochlorous acid and hypochlorite ion). The ability to accurately and reproducibly analyze the free chlorine content of samples is essential in water testing methods (e.g., treated water, estuary, seawater, and drinking water). Hach provides a sample method (8021) that, when used in conjunction with the Shimadzu UV-1240 spectrophotometer, can determine the free chlorine content in the 0.02- to 2.00-mg/L range.

Materials and Methods:
Free chlorine content determination is a simple process using Hach method 8021 and the Shimadzu UVMini-1240. Free chlorine can be present in two forms, hypochlorous acid and hypochlorite ion. The free chlorine reacts with the DPD reagent (N,N-diethyl-p-phenylenediamine) in the Hach reagent to form a bright pink color. This color production is proportional to the amount of free chlorine in the sample.

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Article: Quantitative Analysis Of Free Chlorine

SOURCE: Shimadzu Scientific Instruments

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