工业级                                                                                              食品级

 主含量（以(NH4)2HPO4计）%≥99.0                                    主含量（以(NH4)2HPO4计）%≥99.0

五氧化二磷（以P2O5计）%≥53.0                                            五氧化二磷（以P2O5计）%≥53.0

氮（以N计）%≥20.8                                                                  氮（以N计）%≥20.8

PH值 7.8-8.2                                                                                PH值 7.8-8.2

水份%≤0.2                                                                                    水份%≤0.2

水不溶物%≤0.10                                                                           重金属（以Pb计）%≤0.001

                                                                                                         砷（以As计）%≤0.0003

                                                                                                         氟化物（以F计）%≤0.005

                                                                                                          水不溶物%≤0.10