采用吡啶偶氮间苯二酚（PAR）分光光度法测定富铀水文地球化学样品中的钒。

Spectrophotometric method for the determination of vanadium in uranium rich hydrogeochemical samples using pyridyl azo resorcinol (PAR).

作者信息

Chakrapani G, Murty D S, Balaji B K, Rangaswamy R

机构信息

Chemical Laboratory, Atomic Minerals Division, Department of Atomic Energy, Nagarbhavi, Bangalore 560072, India.

出版信息

Talanta. 1993 Apr;40(4):541-4. doi: 10.1016/0039-9140(93)80014-i.

DOI:10.1016/0039-9140(93)80014-i

PMID:18965663

Abstract

A simple and precise method has been developed for the determination of traces of vanadium(V), using 4-(2 pyridyl azo) resorcinol, in natural water samples, containing very high concentrations of uranium. CDTA-pyrophosphate buffer has been used for masking interferants, including uranium which otherwise interferes above 125 ppb. The reaction of vanadium with PAR in the presence of buffer requires a waiting period of 45 min. The Sandell sensitivity of the method is 0.003 microg/ml, at 545 nm at an optimum pH of 6.5 +/- 0.2. The precision of the method is +/- 15% at the 100 ppb level of vanadium(V). The method has been successfully applied to a number of natural water samples during hydrogeochemical exploration.

摘要

已开发出一种简单而精确的方法，用于测定天然水样中痕量的钒（V），该水样含有非常高浓度的铀，使用4-（2-吡啶偶氮）间苯二酚。CDTA-焦磷酸盐缓冲液用于掩蔽干扰物，包括铀，否则铀在浓度高于125 ppb时会产生干扰。在缓冲液存在下，钒与PAR的反应需要45分钟的等待时间。该方法在545 nm、最佳pH值为6.5±0.2时的桑德尔灵敏度为0.003微克/毫升。在钒（V）浓度为100 ppb时，该方法的精密度为±15%。该方法已成功应用于水文地球化学勘查中的多个天然水样。