This standard is formulated for the purposes of enforcing the Environment Protection Law of the People’s Republic of China and Water Pollution Prevention and Control Law of the People’s Republic of China, protecting the environment, safeguarding the human health, and setting standards for the determination of chlorophyll a in water. This standard specifies the spectrophotometric method used to determine chlorophyll a in water. This standard is the original version.

 Water quality-Determination of chlorophyll a-Spectrophotometric method (HJ 897-2017)