用铜-二乙基二硫代氨基甲酸盐-β-环糊精显色体系分光光度法测定痕量铜

Spectrophotometric determination of trace copper with a Cu-diethyldithiocarbamate-beta-cyclodextrin colour system.

作者信息

Li S, Li S, Chen A

机构信息

Department of Basic Sciences, Shanxi Agricultural University, Taigu, People's Republic of China.

出版信息

Talanta. 1993 Jul;40(7):1085-90. doi: 10.1016/0039-9140(93)80170-v.

DOI:10.1016/0039-9140(93)80170-v

PMID:18965752

Abstract

A simple, selective and accurate spectrophotometric method for determination of trace copper with diethyldithiocarbamate(DDTC) in the presence of beta-cyclodextrin(beta-CD) in ammonia media has been developed. The apparent molar absorptivity of Cu(II)-DDTC-beta-CD inclusion complex is 1.3 x 10(4) 1 . mole(-1) . cm(-1) at 436 nm, and Beer's law is obeyed for copper in the range 0-150 mug/25 ml. The detection limit is 4.38 x 10(-7)M(S/N = 3). The proposed method has been successfully applied to the determination of copper in aluminium alloys, soils, millet, wheat flour, herbs, vegetables and some traditional Chinese herbal medicines with satisfactory results.

摘要

已开发出一种简单、选择性好且准确的分光光度法，用于在氨介质中β-环糊精（β-CD）存在下，用二乙基二硫代氨基甲酸盐（DDTC）测定痕量铜。Cu（II）-DDTC-β-CD包合物在436nm处的表观摩尔吸光率为1.3×10⁴L·mol⁻¹·cm⁻¹，在0 - 150μg/25ml范围内铜遵守比尔定律。检测限为4.38×10⁻⁷M（S/N = 3）。该方法已成功应用于铝合金、土壤、小米、小麦粉、草药、蔬菜及一些传统中药中铜的测定，结果令人满意。