用六甲基磷酰胺液-液萃取硫氰酸钼并在有机相中直接进行分光光度测定。

Liquid-liquid extraction of molybdenum thiocyanate with hexamethyl phosphortriamide and direct spectrophotometric determination in the organic phase.

作者信息

Mitra M, Mitra B K

机构信息

Department of Chemistry, Jadavpur University, Calcutta-7000032, India.

出版信息

Talanta. 1977 Nov;24(11):698-9. doi: 10.1016/0039-9140(77)80073-8.

DOI:10.1016/0039-9140(77)80073-8

PMID:18962182

Abstract

A sensitive and selective method for estimation of trace molybdenum with fairly common reagents has been developed. The Mo-thiocyanate complex is extracted with hexamethyl phosphortriamide and chloroform from 0.75-1.5M hydrochloric acid. The molar absorptivity is 1.76 x 10(4) 1.mole(-1).cm(-1). The system obeys Beer's law at 460nm over the molybdenum concentration range 0.75-5ppm. The method is simple, rapid, and requires no additional reducing agent. It is generally free from interference by most of the metals commonly associated with molybdenum, including rhenium. Molybdenum in alloy steel has been successfully determined.

摘要

已开发出一种使用相当常见的试剂来测定痕量钼的灵敏且选择性的方法。钼 - 硫氰酸盐络合物从0.75 - 1.5M盐酸中用六甲基磷三酰胺和氯仿萃取。摩尔吸光系数为1.76×10⁴ L·mol⁻¹·cm⁻¹。该体系在460nm下钼浓度范围为0.75 - 5ppm时符合比尔定律。该方法简单、快速，且无需额外的还原剂。它通常不受大多数与钼常见伴生的金属（包括铼）的干扰。已成功测定了合金钢中的钼。