论文部分内容阅读
研究了在溴化十六烷基三甲基铵(CTMAB)、聚乙二醇辛基笨基醚(OP)、正丁醇、正庚烷和水自制复配型微乳溶液存在下Hg(Ⅱ)与3-甲氧基-甲亚胺H的显色反应,建立了分光光度法测定微量汞的新方法。试验表明,在pH5.90的HAc-NaAc缓冲溶液中,Hg(Ⅱ)与试剂形成1∶2的淡黄色络合物,络合物的最大吸收峰位于470nm波长处,表观摩尔吸光系数ε为3.3×105L·mol-1·cm-1。Hg(Ⅱ)含量在0.008～0.60μg/mL范围内符合比尔定律,检出限为0.003μg/mL。本法采用巯基葡聚糖凝胶(SDG)分离样品中共存离子并富集汞,提高了方法的选择性。用于测定两个水样中微量汞,回收率分别为96.4%和98.6%,相对标准偏差分别为2.4%和3.5%(n=6)。
The effect of Hg (superscript +) in the presence of cetyltrimethylammonium bromide (CTMAB), polyethylene glycol octyl stupid ether (OP), n-butanol, n-heptane and water- Ⅱ) with 3-methoxy-azomethine H to establish a new spectrophotometric method for the determination of trace mercury. The results showed that Hg (Ⅱ) formed a 1: 2 yellowish complex with HAc-NaAc buffer solution at pH5.90. The maximum absorption peak of the complex was at 470nm. The apparent molar absorptivity ε 3.3 × 105L · mol-1 · cm-1. Beer’s law was obeyed with the content of Hg (Ⅱ) in the range of 0.008 ~ 0.60μg / mL with the detection limit of 0.003μg / mL. This method uses mercapto-dextran gel (SDG) to separate coexisting ions in sample and enrich mercury, which improves the selectivity of the method. For the determination of trace mercury in two water samples, the recoveries were 96.4% and 98.6%, respectively, with relative standard deviations of 2.4% and 3.5%, respectively (n = 6).