十二烷基苯磺酸钠增敏水杨叉-2-氨基-4-硝基苯酚分光光度法测定水中微量铜(Ⅱ)  

Salicylidene-2-amino-4-nitrophenol spectrophotometric determination of trace Cu(Ⅱ) in water with sodium dodecylbenzene sulfonate enhancing sensitivity

作　　者：莫东兰 张夏红[1,2] 董雁 李晋琪[1] MO Donglan;ZHANG Xiahong;DONG Yan;LI Jinqi(Department of Chemistry and Material Engineering,Longyan University,Longyan 364012,China;Fujian Provincial Colleges and University Engineering Research Center of Solide Waste Resource Utilization,Longyan 364012,China)

机构地区：[1]龙岩学院化学与材料学院,福建龙岩364012 [2]固体废弃物资源利用福建省高校工程研究中心,福建龙岩364012

出　　处：《冶金分析》2022年第4期53-56,共4页Metallurgical Analysis

基　　金：福建省教育厅中青年教育科研项目(JA15507);福建省重点学科资助项目;龙岩市科技局重点计划项目(2015LY25)。

摘　　要：铜及其化合物在工业和农业中应用广泛,铜是人体必需的微量元素,但过量的铜对人类和动植物的伤害也不容小觑,因此环境中铜元素的监测非常重要,需要开发便捷快速的铜离子检测方法。在pH=8.0的NH_(3)-NH_(4)Cl缓冲溶液中,席夫碱水杨叉-2-氨基-4-硝基苯酚(SANP)与铜(Ⅱ)形成1∶1的络合物,其最大吸收波长位于350 nm,加入表面活性剂十二烷基苯磺酸钠(SDBS)后络合物由无色变为黄色,最大吸收波长移至439 nm。研究发现,铜(Ⅱ)质量浓度在0~0.635 mg/L范围与吸光度呈线性关系,线性回归方程为A=0.080 4+0.079 4ρ,线性相关系数r为0.999 83,表观摩尔吸光系数ε为8.74×10^(4) L·mol^(-1)·cm^(-1),检出限为0.13 mg/L。方法用于工业废水中微量铜(Ⅱ)的测定,结果的相对标准偏差(RSD,n=6)为1.6%~2.1%,加标回收率为99%~102%,测定值与电感耦合等离子体原子发射光谱法(ICP-AES)的测定值基本一致。Copper and its compounds are widely used in industry and agriculture.Copper is a kind of essential trace element for human body,but its harm to human,animals and plants cannot be underestimated in the case of excessive intake.Therefore,the monitoring of copper in the environment is very important,and it is necessary to develop a convenient and rapid method for the detection of copper ions.In the NH_(3)-NH_(4)Cl buffer solution at pH=8.0,the Schiff base salicylidene-2-amino-4-nitrophenol(SANP) could react with copper(Ⅱ) to form a complex with a molar ratio of 1∶1.The maximum absorption wavelength was at 350 nm.After adding the surfactant sodium dodecylbenzene sulfonate(SDBS),the complex changed from colorless to yellow,and the maximum absorption wavelength shifted to 439 nm.It was found that the mass concentration of copper(Ⅱ) in the range of 0-0.635 mg/L had a linear relationship with the absorbance.The equation of linear regression was A=0.080 4+0.079 4ρ.The linear correlation coefficient was r=0.999 83.The apparent molar absorptivity was ε=8.74×10~4 L·mol^(-1)·cm^(-1).The limit of detection was 0.13 mg/L.The proposed method was applied to the determination of trace copper(Ⅱ) in industrial wastewater.The relative standard deviations(RSD,n=6) of determination results were between 1.6% and 2.1%,and the recoveries were between 99% and 102%.The measured values were basically consistent with those obtained by inductively coupled plasma atomic emission spectrometry(ICP-AES).

关 键 词：水杨叉-2-氨基-4-硝基苯酚(SANP) 席夫碱 铜(Ⅱ) 增敏 工业废水 

分 类 号：O657.32[理学—分析化学]