Name                              Scope                                   Analysis method

  Appearance                     Achromaticity and                   eyeballing

                                         clarity liquid

  Chroma                              ≤20                                   GB/T 605-06

  Content(H3PO4)%           ≥75.0                                  GB 3149-04/4.4

                                            ≥85.0

 (Cl^-%)                                ≤0.0005                                GB/T 2091-03 

(SO₄^2-)%                             ≤0.003                                  GB/T 2091-03

Heavy metals(Pb)%             ≤0.0005                               GB 3149-04/4.7

 (As)%                                ≤0.00005                              GB3149-04/4.5

H3PO3 and HPO2%          ≤0.012                                  GB3149-04/4.8

(F)%                                  ≤0.001                                  GB3149-04/4.6