Summary
Chlorine has been be determined in air and water samples by a rapid and sensitive method entailing precolumn derivatization to 4-bromoacetanilide. A mixed potassium bromide-acetanilide reagent was used as a trapping agent for chlorine in air, and for its derivatization. The 4-bromoacetanilide formed was determined by reversed-phase HPLC on an ODS column, using methanol-water, 65∶35 (v/v) as mobile phase; detection was at 240 nm. A rectilinear calibration graph was obtained for the range 0.1–30 μg mL−1 chlorine; the limit of detection found to be 0.01 μg mL−1.
The precolumn derivative has been found to have a shelf-life of at least 21 days; this enables the use of the method for samples transported from the field to the analytical laboratory, or the testing of a variety of conditions for chlorine scrubbing studies without the need for immediate analysis of samples. Humic substances do not cause any interference with the proposed method and the presence of nitrite does not lead to artificially high results and consequent misleading conclusions of the presence of high levels of chlorine.
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Jain, A., Verma, K.K. HPLC determination of chlorine in air and water samples following precolumn derivatization to 4-bromoacetanilide. Chromatographia 37, 492–496 (1993). https://doi.org/10.1007/BF02275785
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DOI: https://doi.org/10.1007/BF02275785