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 paraquat and diquat in water. This standard specifies the solid phase extraction high performance liquid chromatography used to determine paraquat and diquat in water. The appendixes A and B to this standard are referential. This standard is the original version.

 Water quality–Determination of paraquat and diquat–Solid phase extraction high performance liquid chromatography (HJ 914-2017)