氯金酸分光光度法测定废水中微量亚硫酸盐  

Spectrophotometric determination of micro sulfite in waste water with chloroauric acid

作　　者：梁爱惠[1] 严文青[1] 金文英[1] 

机构地区：[1]桂林工学院材料与化学工程系,广西环境工程与保护评价重点实验室,广西桂林541004

出　　处：《冶金分析》2009年第7期68-70,共3页Metallurgical Analysis

基　　金：广西自然科学基金(项目编号:0832260);广西环境工程与保护评价重点实验室研究资金资助项目(桂科能0701K008);广西高校人才小高地建设"环境工程"创新团队资助计划项目(桂教人[2007]71号)

摘　　要：基于亚硫酸钠与氯金酸还原反应生成的金纳米粒子在532nm处有最大吸收，建立一种用分光光度法测定水中亚硫酸盐的新方法。研究了氯金酸用量等因素对体系的影响，优化了试验条件，并对水中Cu^2＋，Zn^2＋，Ca^2＋，Fe^3＋，Mg^2＋，Al^3＋等常见离子进行了干扰试验。在最佳实验条件下，随着亚硫酸根浓度增大，其吸收值线性增加，亚硫酸根（SO3^2-）的质量浓度在0．62～17．8μg／mL范围内与纳米金粒子吸光度同试剂空白吸光度差值△A532nm呈良好的线性关系，其回归方程为△A532nm=0．0295 ρ-0．0124，相关系数为0．9990，检出限（3d）为0．023μg／mL。该法用于废水中亚硫酸盐的测定，所得结果与碘量法测得的结果相符。测定结果的RSD在0．8％～2．3％之间，回收率在96．6％～103．4％之间。A new method for the determination of sulfite in waste water by spectrophotometric method is described, based on the formation of a gold nanoparticle in the reaction between chloroauric acid and sodium sulfite. The gold nanoparticle has a maximum absorption peak at 532 nm. The chloroauric acid concentrations and the influence of Cu^2＋ , Zn^2＋ , Ca^2＋ , Fe^3＋, Mg^2＋ and Al^3＋ on the determination were examined. Under the conditions chosen, the absorbance difference （AA） of the gold nanoparticle and reagent blank increased with the sulfite concentration increasing. AA is proportional to the sulfite concentration （ρ） from 0. 62 to 17. 8 μg/mL, with a detection limit（3a） of 0. 023μg/mL. The regress equation is AA = 0. 029 5 ρ-- 0. 012 4, with a correlation coefficient of 0. 999 0. This method has been applied to the determination of sulfite in waste water samples. The results are consistent with thse obtained by iodometry. The values of RSD and recovery obtained are in the ranges of 0. 8 % -- 2.3 % and 96. 6 % -- 103.4 %, respectively.

关 键 词：分光光度法 亚硫酸盐 金纳米粒子 废水 

分 类 号：O657.32[理学—分析化学]