系列羟基卟啉检测汞离子的实验条件优化和吸收光谱性质  

Spectroscopy properties and optimization for the detection of mercury(Ⅱ) with series hydroxyl-porphyrins

作　　者：法焕宝[1,2] 陈声芳[1] 张明[1] 霍丹群[2] 尹伟[1] 罗小刚[2] 卢中明[2,3] 侯长军[2] 李艳[1] 韩丽[1] 

机构地区：[1]重庆大学化学与化工学院,重庆400030 [2]重庆大学生物工程学院"生物流变科学与技术"教育部重点实验室,重庆400030 [3]泸州老窖股份有限公司,泸州646000

出　　处：《环境化学》2012年第1期107-112,共6页Environmental Chemistry

基　　金：国家自然科学基金(31101284);重庆市自然科学基金(CSTC;2010BB1209;2009BB6213);中国博士后科学基金(20080440702);中央高校基本科研业务费(CDJRC10220005);重庆大学研究生创新团队(200909B1008);重庆大学大学生科研训练计划(CQU-SRTP-2010519)资助

摘　　要：结合紫外分光光度法研究系列羟基卟啉与汞离子的显色反应,并优化其检测条件.在pH=7.5的条件下,以N,N-二甲基甲酰胺(DMF)作为溶剂,加入0.4 mL表面活性剂Tween-80,系列羟基卟啉与Hg2+发生配位反应,发现其最大吸收峰与卟啉环上(meso)位苯基对位上的羟基数目相关.热力学研究表明,单羟基卟啉化合物对Hg2+检测效果最好,形成1∶1配位化合物,检测限可达0.042μg.L-1,且在0—50 mg.L-1范围内符合比尔定律.The spectroscopy properties of series hydroxyl-porphyrins for the detection of mercury ions（Ⅱ） were studied to obtain the optimal reaction conditions.The results indicated that coordination reactions between series hydroxyl-porphyrins and Hg2＋ were processed in the resolvent of DMF with 0.4 mL Tween-80 as surfactant,when the pH was controlled at 7.5.It also suggested the soret peak were redshifted by different amounts,which were positive correlated with the number of hydroxyl groups on porphyrin ring.The study of thermodynamics predicted that the monohydroxyl-porphyrin had the optimal identification effects for Hg2＋,and a stable complex was formed with molar ratio 1 ∶ 1.The detection limit is 0.04 μg · L-1,and it obeyed the Beer′s law in the range of 0—50 mg · L-1.

关 键 词：羟基卟啉 汞离子 分光光度法 热力学 

分 类 号：X132[环境科学与工程—环境科学]