巯基葡聚糖凝胶分离富集5-(对羧基苯偶氮)-8-羟基喹哪啶分光光度法测定微量汞(Ⅱ)  

Spectrophotometric determination of micro mercury(Ⅱ) with 5-(p-carboxylphenylazo)-8-hydroxyquinaldine after separation and enrichment by mercapto-dextrangel

作　　者：徐国想[1] 马卫兴[1] 陈文宾[1] 陈璧珠 

机构地区：[1]淮海工学院化学工程系,江苏连云港222005

出　　处：《冶金分析》2009年第11期29-33,共5页Metallurgical Analysis

基　　金：教育部重点实验室开放基金资助项目(CPEUKF06-04);江苏省高等学校大学生实践创新训练计划(2008603);江苏省科技厅自然科学基金(BK2005045)

摘　　要：研究了在CTMAB-OP微乳溶液存在下，5-（对羧基苯偶氮）-8-羟基喹哪啶（5-CPAHQD）与汞（Ⅱ）发生显色反应的条件，建立了测定微量汞（Ⅱ）新的高灵敏度分光光度法。实验结果表明，在醋酸-醋酸钠介质中，5-（对羧基苯偶氮）-8-羟基喹哪啶与汞（Ⅱ）发生灵敏的显色反应，生成络合比为2：1的橙红色络合物。络合物的最大吸收峰位于508nm，表观摩尔吸收系数为3.5×10^5L·mol^-1·cm^-1，在10mL溶液中汞（Ⅱ）量在0.01—1.2μg之间符合比耳定律，检出限为0.3mg／L，并且该显色反应具有较强的抗干扰能力，用于水、铅锌矿样品中微量汞（Ⅱ）的测定，结果与原子吸收光谱法相一致，方法的回收率在97％—104％之间，其相对标准偏差（n=6）≤4.5％。A novel spectrophotometrie determination method of trace mercury （Ⅱ） with high sensitivity was established based on the color reaction of chromogenic agent 5-（ p-carboxylphenylazo）-8- hydroxyquinaldine （5-CPAHQD） with Hg（Ⅱ） in the presence of CTMAB-OP micromulsion. The re- sults showed that in HAC-NaAC medium, a red stable complex with molar ratio of 2：1 was formed by the reaction between 5-CPAHQD and Hg（Ⅱ）. The maximum absorption peak of this complex was at 508 nm with the apparent molar absorptivity of 3.5×10^5L·mol^-1·cm^-1. Beerrs law was obeyed for 0.01-1.2μg of Hg（Ⅱ） in 10 mL of solution. The detection limit was 0.3 mg/L. The color reaction system had strong interference resistanee, which enabled it could be applied to the determination of trace Hg（Ⅱ） in water and lead-zinc ore samples. The determination results were in consistent with those obtained by AAS method. The recovery of this method was in the range of 97%-104% and the RSD （n=6） was ≤4.5%.

关 键 词：5-(对羧基苯偶氮)-8-羟基喹哪啶 分光光度法 汞(Ⅱ) 

分 类 号：O657.32[理学—分析化学]