摘要
本文研究了由十六烷基三甲基溴化铵(CTMAB)、正丁醇、正庚烷和水自制微乳溶液存在下,4-(6-甲氧基-8-喹啉偶氮)-间苯三酚(MQAPG)与Au(Ⅲ)的显色反应,建立了分光光度法测定微量Au(Ⅲ)的新方法。结果表明,在PH 10.0的Na2B4O7-NaOH缓冲溶液中,Au(Ⅲ)与试剂形成1:2的红色络合物,络合物的最大吸收峰在510nm波长处,表观摩尔吸光系数ε为2.6×10^5L·mol^-1·cm^-1.Au(Ⅲ)浓度在0.007~0.8μg/mL范围内符合比尔定律,检出限为0.002μg/mL。本法用于金矿石中微量金的测定,回收率在97.4%~98.8%之间,相对标准偏差(RSD)在0.64%~0.70%(n=6)范围内,测定结果与原子吸收光谱法的结果相一致。
The color reaction of the reagent 4-(6-methoxyl-8-quinolineazo)-phloroglucinol with Au(Ⅲ) in the presence of self-made microemulsion containing CTMAB, butanol (n-C4H9OH), heptane (n- C7 H14) and water was studied. A new spectrophotometric method for the determination of micro Au(Ⅲ) was proposed. Results showed that the new color reagent reacts with Au(Ⅲ) to form a stable red complex(1 : 2) in the medium of Na2B4O7-NaOH buffer solution at pH 10.0. The maximum absorption wavelength and apparent molar absorptivity are 510 nm and 2. 6 × 10^5 L · mol^-1· cm^-1 ,respectively. Beer's law is obeyed in the range of 0. 007-0.8μg/mL for Au(Ⅲ). The detection limit is 0. 002μg/mL. The method has been applied to the determination of micro Aul(Ⅲ) in gold ore with the recovery of 97.4%-98.8%, and the relative standard deviation(RSD) of 0. 64%-0. 70% (n= 6). The results are consistent with those obtained by AAS.
出处
《冶金分析》
CAS
CSCD
北大核心
2008年第7期46-49,共4页
Metallurgical Analysis
基金
江苏省海洋生物技术重点建设实验室基金项目(2005HS001
2006HS020)
淮海工学院自然科学基金(Z2006001)