质量标准
外观appearance white crystalline powder
水溶性solubility clear colorless solution at 10g plus 40ml of 0.1nsodium hydroxide
红外光谱IR spectrum conforms to structure
水分water by karl fischer 1-2 %
紫外吸收UV absorbance ≤ 0.1 at 290nm (20%w/w in 0.1N NaOH)
重金属Heavy Metals (as Pb) ≤5 ppm
纯度purity by titration ≥99%