摘要:利用氟离子选择性电极标准曲线法测定电镀铬废水中氟离子含量,得标准曲线方程为y=59.6x一2.2,相关系数接近于l,方法误差为2.0%~5.4%。该法简便、快捷、准确,其测定结果与氟试剂分光光度法的测定结果一致。
关键词:电镀铬;废水;氟离子;测定;标准曲线法;离子选择性电极
中图分类号:TQl53.11 文献标志码:A
文章编号:1004—227X(2009)02—0031—02
Determination of fluoride ions in chromium electr0.plating wastewater//YANG Xiao—yah*,LI Li,WANG Bi-xuan,XIAO Ju—hua,ZHU Qi
Abstract:A method for the determination of F—in chromium—electroplating wastewater was established based on fluoride ion selective electrode by standard curve.The standard curve regression equation is y=59.6x一2.2,and its relativity of the linear regression equation approaches l.000.The absolute error of the testing ranges from 2.0%t0 5.4%.The method is simple,rapid and accurate.The determination result of the method accords with that obtained by spectr0· photometry with alizarin complexone as chromogenic reagent.
Keywords:chromium—electroplatin9;wastewater;fluoride ion;determination;standard curve method;ion selective electrode
First.author’s address:School of Environment and Chemical Engineerin9,Nanchang Hangkong University,Nanchan9 330063,China
1 前言 电镀铬废水中游离氟离子主要来源于添加剂,含量少,需用离子选择性电极或可见光分光光度计来测定。本文采用经典国标法一氟离子选择性电极法,以氟电极为指示电极,甘汞电极为参比电极,根据能斯特方程E=K一blg[F-]对电镀铬废水中的氟离子进行定量分析。测定时,加入离子强度缓冲剂以固定离子强度,使电位φ与F-浓度符合能斯特方程,消除OH-干扰,确保pH在最佳范围(5.0~5.5)内,同时还可将铁、铝等氟配合物中的氟离子释放为游离形态的氟。
电镀铬废水中氟离子的测定:仪器与试剂 电镀铬废水中氟离子的测定:实验步骤 电镀铬废水中氟离子的测定:结果与讨论 电镀铬废水中氟离子的测定:结语 |