2,2-联氮-二(3-乙基-苯并噻唑-6-磺酸)(ABTS)和N,N-二乙基对苯二胺(DPD)显色分光光度法测定水中微量高碘酸盐的对比  

Comparison of the spectrophotometric determination for trace periodate in water with 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonate)(ABTS)and N,N-diethyl phenylene-1,4-diamine(DPD)

作　　者：胡星 刘绍刚 董慧峪[3] 谭学才 龙桂发 李海翔[1] HU Xing;LIU Shaogang;DONG Huiyu;TAN Xuecai;LONG Guifa;LI Haixiang(College of Environmental Science and Engineering,Guilin University of Technology,Guilin,541000,China;Key Laboratory of Chemistry and Engineering of Forest Products,State Ethnic Affairs Commission,Key Laboratory of Applied Analytical Chemistry(Guangxi Minzu University),Guangxi Minzu University,Nanning,530006,China;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,100085,China)

机构地区：[1]桂林理工大学环境科学与工程学院,桂林541000 [2]广西民族大学化学化工学院,林产化学与工程国家民委重点实验室,广西高校应用分析化学重点实验室,南宁530006 [3]中国科学院生态环境研究中心,中国科学院饮用水科学与技术重点实验室,北京100085

出　　处：《环境化学》2024年第7期2269-2279,共11页Environmental Chemistry

基　　金：国家自然科学基金(21976040);广西科技基地和人才专项(桂科AD22080017);广西高等学校创新团队及卓越学者计划;广西民族大学校级引进人才科研启动项目(2021KJQD11)资助。

摘　　要：高碘酸盐(IO_(4)^(-),PI)因具有强氧化性和化学稳定性,被广泛应用于环境污染物的氧化降解,然而传统的PI分析方法具有操作复杂、费用高和检出限高等缺点,不适用于常规分析.因此如何快速、准确、低成本测定水中微量PI备受环境领域研究者的关注.本研究基于2,2-联氮-二(3-乙基-苯并噻唑-6-磺酸)(ABTS)和N,N-二乙基对苯二胺(DPD)与PI氧化显色的原理,建立了两种利用分光光度法测定水中低浓度PI的方法.结果表明,当pH=3.0时,ABTS与PI的反应化学计量系数接近1:2,最大吸光值在415 nm处,标准曲线线性范围为0—20μmol·L^(-1)(R^(2)>0.997),灵敏度为(6.45±0.03)×10^(4)L·mol^(-1)·cm^(-1),检出限和定量下限分别为1.1×10^(-8)mol·L^(-1)和3.3×10^(-8)mol·L^(-1);当pH=6.5时,DPD与PI的反应化学计量系数为1:2,最大吸光值在551 nm处,标准曲线线性范围为0—40μmol·L^(-1)(R^(2)>0.998),灵敏度为(2.11±0.08)×10^(4)L·mol^(-1)·cm^(-1),检出限和定量下限分别为3.7×10^(-7)mol·L^(-1)和1.23×10^(-6)mol·L^(-1).最后,研究了水中常见共存离子、腐殖酸、实际水质背景对PI测定的影响以及加标回收率,发现两种方法均具有良好的抗干扰性、稳定性和检测精度.本研究结果表明两种方法可准确、快速、低成本测定水中微量PI浓度并具有较好的应用前景.Periodate(IO_(4)^(-),PI)is widely used in the oxidative degradation of environmental pollutants due to its strong oxidation and chemical stability.However,traditional methods for PI analysis have the disadvantages of complicated operation,high cost and high detection limit,which are not suitable for routine analysis.Therefore,detecting trace PI in water quickly,accurately and cheaply has attracted much attention from environmental researchers.Two new spectrophotometric methods for the determination of trace PI in water were proposed based on the oxidative coloration of 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonate)(ABTS)or N,N-diethyl-p-phenylenediamine(DPD)and PI in this study.Results show that the stoichiometric coefficient of ABTS and PI is close to 1:2,and the maximum absorption value is 415 nm at pH=3.0.The linear range of the standard curve was 0—20µmol·L^(-1)(R^(2)>0.997),and the sensitivity was(6.45±0.03)×10^(4) L·mol^(-1)·cm^(-1).The limit of detection and lower limit of quantitation were 1.1×10^(-8) mol·L^(-1) and 3.3×10^(-8) mol·L^(-1),respectively.The stoichiometric coefficient of DPD and PI reaction was 1:2,the maximum absorption value was 551 nm in pH=6.5.The linear range of the standard curve was 0—40µmol·L^(-1)(R^(2)>0.998),and the sensitivity was(2.11±0.08)×10^(4) L·mol^(-1)·cm^(-1).The limit of detection and lower limit of quantitation were 3.7×10^(-7) mol·L^(-1) and 1.23×10^(-6) mol·L^(-1),respectively.Finally,the influence of common coexisting ions,the actual water quality background and the recovery rate were studied.It was found that two methods have good anti-interference performance,stability and detection accuracy.The results of this study indicate that the two methods can accurately,rapidly and cheaply determine the concentration of trace PI in water,and have a good application prospect.

关 键 词：高碘酸盐 分光光度法 2 2-联氮-二(3-乙基-苯并噻唑-6-磺酸)(ABTS) N N-二乙基对苯二胺 (DPD) 水处理 

分 类 号：X-1[环境科学与工程] O6[理学—化学]