性状 (characters) |
浅黄色结晶性粉末 (pale yellow crystalline powder) |
合格 (conform) |
硫酸盐 (sulphates) |
0.005% |
0.0026% |
铁 (iron) |
0.002% |
0.001% |
碱金属及碱土金属 (alkaline and alkaline earth metal) |
0.2% |
0.08% |
重金属 (heavy metal) |
0.002% |
0.001% |