This standard is formulated to implement the "Environmental Protection Law of the People's Republic of China" and the "Water Pollution Prevention and Control Law of the People's Republic of China", protect the environment, protect human health, and standardize the determination methods of chlorine dioxide and chlorite in wastewater. This standard specifies a continuous titration method for the determination of chlorine dioxide and chlorite in textile dyeing and finishing industrial wastewater. This standard is an amendment to the Iodometric Method for the Determination of Chlorine Dioxide in Water (Interim) (HJ551-2009). This standard was first published in 2009. The original drafting unit was Beijing Environmental Protection Monitoring Center.
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