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 ecological environment, safeguard human health, and standardize the measurement method of turbidity in water.This standard specifies the turbidity meter method for determining turbidity in surface water, groundwater, and seawater.This standard is published as *. This standard is formulated by the Ecological Environment Monitoring Department and the Regulations and Standards Department of the Ministry of Ecology and Environment. This standard was drafted by the Pudong New Area Environmental Monitoring Station in Shanghai. This standard was validated by Shanghai Environmental Monitoring Center, Jiading District Environmental Monitoring Station, Suzhou Environmental Monitoring Center in Jiangsu Province, Ausilicon Analytical Testing (Shanghai) Co., Ltd., Jiading District Center for Disease Control and Prevention in Shanghai, and Shanghai Huace Pinbiao Testing Technology Co., Ltd. This standard was approved by the Ministry of Ecology and Environment on December 31, 2019. This standard shall come into effect on June 30, 2020. This standard is interpreted by the Ministry of Ecology and Environment.

Scope of application: This standard specifies the turbidity meter method for determining turbidity in water. This standard is applicable to the determination of turbidity in surface water, groundwater, and seawater. The detection limit of the method is 0.3 NTU.