指 标 名 称

                   指  标

磷酸二氢钠（NaH₂PO₄．2H₂O）%    ≥

                                               98.0

硫酸盐（以SO₄计）                        %    ≤

                                               0.25

氯化物（以CI计）                           %    ≤

                                               0.014

水不溶物                                            %    ≤

                                               0.05

铁(Fe)                                                  %    ≤

                                               0.01

重金属（以Pb计）                           %    ≤

                                              0.002

砷（As）                                            %    ≤

                                              0.005

PH值

                                            4.2—4.6