The content of involatile impurities in acetamidine hydrochloride was determined by gravimetric analysis.

采用重分析法测定盐酸难挥发质的含。

METHODS Sodium tetraphenylboron gravimetric analysis was replaced by highly-accurate nephelometric titrimetry to determine potassium chloride in Compound sodium chloride injection.

法用高精度散射光度滴定法代替四苯硼钠重法。