Analyze Immediately. Residual Chlorine. Topics…. Background: Chlorine Chemistry Industrial Application NJAC Regulations Summary. Hold Times. 0 - 15 minutes - note time of collection & time of analysis!. Background:. A strong oxidizing agent …therefore, a very reactive element...
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to form hypochlorous acid (HOCl):
Cl2 + H2O HOCl + H+ + Cl-
sulfur dioxide (SO2) sodium bisulfite (NaHSO3)
sodium sulfite (Na2SO3)
sodium thiosulfate (Na2S2O3)
-date of calibration
-ID of standards. -standard conc.
* water treatment - to maintain a residual to kill bacteria
* waste water treatment plants - chlorine is used to destroy pathogens, then chlorine is removed from water prior to discharge into waterway
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