外观appearance white crystalline powder
水溶性solubility clear to slightly hazy colorless solution at 10g plus 30ml of water (with warming)
水分water by karl fischer ≤2%
紫外吸收UV absorbance ≤0.1 at 290 nm (25% w/w)
重金属heavy metals ≤5 ppm (as lead)
purity by NaOH titration ≥99%