卟啉吡啶季铵盐分光光度法测定水中痕量铜  

Spectrophotometric Determination of Traces of Copper in Water with a New Quarternary Ammonium Salt of Porphyrin

作　　者：张志华[1,2] 韩士田[1] 

机构地区：[1]河北师范大学化学与材料科学学院,石家庄050016 [2]邢台医学高等专科学校化学教研室,邢台054000

出　　处：《理化检验（化学分册）》2010年第2期120-121,129,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：河北省自然科学基金资助项目(203147)

摘　　要：在pH1.0邻苯二甲酸氢钾-盐酸缓冲溶液中,新卟啉吡啶季铵盐显色剂——溴化5-[4-N-(对硝基)苄铵基吡啶基]-10,15,20-三(4-N-吡啶基)卟啉与铜(Ⅱ)形成1∶1配合物。在此显色反应中,新卟啉试剂具有显色和表面活性剂双重功能。此配合物的最大吸收波长为427.0nm,表观摩尔吸光率为1.78×105L.mol-1.cm-1,铜(Ⅱ)质量浓度在0.12mg·mL-1以内符合比耳定律。该方法应用于3个环境水样中铜(Ⅱ)的测定,测定值与已知值的平均相对误差均小于4%A new chromogenic reagent-5-[- 4-（ p-nitro ）-benzylammonium pyridyl-]-10, 15, 20-tris-（ 4-N- pyridyl） porphyrin bromide was used to react with Cu （ Ⅱ ） in a phthalate buffer medium of pH 1. 0 to form a coordination complex of molar ratio of 1 to 1. Absorption maximum of the complex lies at the wavelength of 427. 0 nm with the molar absorptivity of 1. 78 × 10^5 L · mol·^-1· cm^-1. Linear relationship between values of absorbance and mass concentration of copper was kept in the range within 12 mg · L^-1. In the reaction, this new reagent acted not only as a chromogenic reagent but also as a surfactant. Three environmental water samples with known copper contents were analyzed by this method, the results obtained showed average relative deviation less than 3. 5 % as compared with the known values.

关 键 词：分光光度法 卟啉吡啶李铵盐 铜 水 

分 类 号：O657.32[理学—分析化学]