white crystalline granule or powder, easy to dissolve in the water.

Index items	Standard value	Test Results
Appearance	White or yellowish crystal powder	Meets the requirement
purity	≥99%	99.2%
PH value	6.0—8.0	6.70
Sulphate	≤0.05%	0.03%
chloride	≤0.04%	0.04%
lead,ug/g	≤2%	1.38%
loss on drying	≤0.5%	0.21%
Reducing substances	≤0.7%	0.38%