質(zhì)量標準：

指標名稱                                       指標

一等品                                       合格品

磷酸二氫鈉（以NaH 2PO4 H 2O）含量，%≥     96.0               95.0

硫酸鹽（以SO42計）含量，%≤                 0.8                 0.8

氟化物（以CI計）含量，%≤                   0.1                  0.2

水不溶物%≤                                 0.2                  0.3

Ph值                                          4.2-4.6             4.2-4.6