对-磺基苯亚甲基罗丹宁固相萃取分光光度法测定银的研究

[Study on solid-phase-extraction spectrophotometric determination of silver with p-sulfobenzylidene-rhodanine].

作者信息

Wang Lin, Hu Qiu-fen, Yang Guang-yu, Yin Jia-yuan

机构信息

The School of Chemistry and Bio-Science, Yunnan University for Nationalities, Kunming 650031, China.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2004 Feb;24(2):187-9.

PMID:15769013

Abstract

The color reaction of silver with p-sulfobenzylidene-rhodanine (SBDR) was studied. Based on the color reaction of SBDR with silver (I) and the solid phase extraction of its colored complex with Waters Porapak Sep-Park-C18 cartridge, a new method for the determination of micro-amount of silver (I) was studied. In the presence of pH = 2.8 citric acid-sodium hydroxide buffer solution and Tween-80 medium, SBDR can react with silver (I) to form a stable 2:1 complex. The colored complex can be extracted by C18 cartridge and eluted by ethanol (containing 5% acetic acid), and then can be determined by spectrophotometry. The molar absorptivity is 7.53 x 10(4) L x mol(-1) x cm(-1) at 520 nm. Beer's law is obeyed in the range of 0-1.2 microg x (25 mL)(-1). This method can be applied to the determination of silver in water with satisfactory results.

摘要

研究了银与对磺基苯亚甲基罗丹宁（SBDR）的显色反应。基于SBDR与银（I）的显色反应及其有色络合物用Waters Porapak Sep - Park - C18柱进行固相萃取，研究了一种测定微量银（I）的新方法。在pH = 2.8的柠檬酸 - 氢氧化钠缓冲溶液和吐温 - 80介质存在下，SBDR能与银（I）反应形成稳定的2∶1络合物。该有色络合物可用C18柱萃取，并用乙醇（含5%乙酸）洗脱，然后用分光光度法测定。在520 nm处摩尔吸光系数为7.53×10⁴ L·mol⁻¹·cm⁻¹。在0～1.2 μg·(25 mL)⁻¹范围内符合比尔定律。该方法可用于水中银的测定，结果令人满意。