一种用于岩石中铜的分光光度测定的离子交换流动注射系统。

A flow injection system with ion-exchange for spectrophotometric determination of copper in rocks.

作者信息

Pedrazzi E M, Santelli R E

机构信息

Chemistry Institute, Federal Fluminense University, Niterói-RJ, 24020, Brazil.

出版信息

Talanta. 1993 Apr;40(4):551-5. doi: 10.1016/0039-9140(93)80016-k.

DOI:10.1016/0039-9140(93)80016-k

PMID:18965665

Abstract

A flow injection system is proposed for the spectrophotometric determination of copper in rocks. Samples are mineralized by treatment with hydrofluoric and perchloric acids and the solutions analysed after iron III precipitation. Copper is preconcentrated in a small CHELEX-100 resin column placed in the flow system, eluted with 2.5M nitric acid and further mixed with diethanoldithiocarbamate (DEDC) in basic medium. The coloured complex was monitored at 410 nm. With the proposed system, about 2-30 samples are run per hour with low reagent consumption. Beer's law is followed within 0.04 and 2.00, microg/ml. Precision and accuracy were assessed by using reference rock standards from USGS and GSJ with copper content as low as 0.4 microg/g with good precision and accuracy.

摘要

提出了一种流动注射系统用于分光光度法测定岩石中的铜。样品用氢氟酸和高氯酸处理进行矿化，在铁（III）沉淀后对溶液进行分析。铜在置于流动系统中的小型CHELEX - 100树脂柱中预富集，用2.5M硝酸洗脱，然后在碱性介质中与二乙醇二硫代氨基甲酸盐（DEDC）进一步混合。在410nm处监测有色络合物。使用该系统，每小时可运行约2 - 30个样品，试剂消耗低。在0.04至2.00μg/ml范围内符合比尔定律。通过使用美国地质调查局（USGS）和日本地质调查局（GSJ）的铜含量低至0.4μg/g的参考岩石标准物质评估精密度和准确度，结果具有良好的精密度和准确度。