[2-(2-喹啉基偶氮)-1,5-二羟基苯分光光度法测定银(I)的研究]

[Study on spectrophotometric determination of silver(I) with 2-(2-quinolinylazo)-1,5-dihydroxidebenzene].

作者信息

Tai Xi, Hu Qiu-fen, Yang Guang-yu, Yin Jia-yuan

机构信息

Department of Chemistry, Yuxi Normal College, Yuxi 653100, China.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2004 Jan;24(1):125-7.

PMID:15768995

Abstract

The color reaction of silver(I) with 2-(2-quinolinylazo)-1,5-dihydroxidebenzene (QADHB) and the solid phase extraction of the colored chelate with Waters Sep-Park C18 cartridge were developed. In the presence of pH = 5.0 sodium citrate-sodium hydroxide buffer solution and sodium dodecyl sulfonate (SDS) medium, QADHB can reacts with silver to form a chelate of a molar ratio 1:2 (silver to QADHB). This chelate can be enriched by the solid phase extraction with Waters Sep-Park C18 cartridge. The retained chelate can be eluted from cartridge with ethanol. In ethanol medium, the molar absorptivity is 6.99 x 10(4) L x mol(-1) x cm(-1) at 550 nm. Beer's law is obeyed in the range of 0-1.2 microg x mL(-1). This method can be applied to the determination of silver in water with satisfactory results.

摘要

研究了银（I）与2-（2-喹啉基偶氮）-1,5-二羟基苯（QADHB）的显色反应以及用Waters Sep-Park C18柱对有色螯合物进行固相萃取的方法。在pH = 5.0的柠檬酸-氢氧化钠缓冲溶液和十二烷基磺酸钠（SDS）介质存在下，QADHB能与银反应形成摩尔比为1:2（银与QADHB）的螯合物。该螯合物可用Waters Sep-Park C18柱进行固相萃取富集。保留的螯合物可用乙醇从柱上洗脱。在乙醇介质中，550 nm处的摩尔吸光系数为6.99×10⁴ L·mol⁻¹·cm⁻¹。在0 - 1.2 μg·mL⁻¹范围内遵守比尔定律。该方法可用于水中银的测定，结果令人满意。