摘要
在乙醇或SDS阴离子表面活性剂存在下,铬(Ⅲ)和5-Br-DMPAP在弱酸性介质中形成吸收峰分别在586nm和590—592nm的配合物。配合比为1比2。反应灵敏度高,对比度大。可应用于钢中微量铬的测定。
Cr(Ⅲ) and 5-Br-DMPAP in weak acidic solution in presence of ethanol or SDS form coloured complex which absorption maximum corresponds to 586 and 590-592nm respectively. The ratio of Cr(Ⅱ) to 5-Br-DMPAP in the complex is 1:2. The molar absorptivity is 8.4×10~4 The complex can be extracted by n-butanol alcohol isoamyl alcohol, tributyl phosphate, methyl iso-butyl ketone and chloroform. This method can be applied to determine the Cr in steels.
出处
《分析试验室》
CAS
CSCD
北大核心
1990年第2期32-33,共2页
Chinese Journal of Analysis Laboratory
