项   目

指   标

含量/

99.5～100.5

透光率/%             ≥   

95.0

水分/%   

7.5～9.0

易炭化物               ≤

1.0

硫酸灰分/%         ≤

    0.05

氧化物/%             ≤

                         0.005

硫酸盐/%             ≤  

                         0.015

草酸盐/%             ≤

                         0.01

污盐/%                ≤

                         0.02

铁/(mg/kg)        ≤

                            5

砷盐/(mg/kg)     ≤

                            1

铅/(mg/kg)         ≤

                           0.5

水不溶物

过滤时间不超过1min,滤膜基本不变色,目视可见杂色颗粒不超过3个