盐酸胍中微量砷的光度测定

Spectrophotometric Determination of Micro Amount Arsenic in Guanidine Hydrochloride with DDTC-A

通过试验认为盐酸胍的存在对红色银胶体吸收曲线、锌用量、反应时间和有色物的稳定性等均无影响 ,并建立了二乙基二硫代氨基甲酸银法测定盐酸胍中微量砷含量的方法。测定 4次生物级盐酸胍中砷的质量分数平均值为 0 12× 10 - 6 ,相对标准偏差为 15 %。当样品中砷的质量分数为 0 5× 10 - 6 和 1 0× 10 - 6 时 ,测定 4次所得标准偏差分别为 8%和 5 %。

An analytical method, spectrophotometric determination of micro amount Arsenic in guanidine hydrochloride with silver diethyldithiocarbamate,has been established.When arsenic amount in the sample is 0 5×10 -6 or 1 0×10 -6 ,its relative standard deviation is 8% or 5%.The relation curves between absorbance and wave length or Zn amount,reaction and laid time are not affected by the existence of guanidine hydrochloride.