电镀废水中Cr(Ⅵ)的次甲基蓝分光光度法研究  

Determination of Chromium(Ⅵ) in Electroplating Wastewater with Methylene Blue by Spectrophotometry

作　　者：范文秀[1] 杨义钧[2] 朱芳坤[1] 张微微[1] 

机构地区：[1]河南科技学院化学化工学院,河南省新乡市华兰大道453003 [2]济源职业技术学院,河南省济源市学苑路454650

出　　处：《光谱实验室》2009年第4期979-981,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：在H2SO4溶液中,以次甲基蓝(MB)为显色剂,利用铬(Ⅵ)与次甲基蓝(MB)在水浴加热条件的显色反应,建立了一种测定电镀废水中微量铬(Ⅵ)的新光度法。反应产物的最大吸收波长为573nm,摩尔吸光系数为1.40×104L·mol-1·cm-1,检出限为2.4×10-7g·mL-1,铬(Ⅵ)含量在10—50μg/25mL范围内有良好的线性关系,相关系数为0.9991,用于测定电镀废水中的微量铬(Ⅵ),加标回收率为97.5%—104.5%,相对标准偏差≤0.46%。In sulfuric acid medium,a new method of spectrophotometric for determining chromium（Ⅵ）in electroplating wastewater was developed based on the reaction of chromium（Ⅵ）and the dye methylene blue in the condition of being heated in the water bath.The maximum absorption of the reaction product is 573nm with molar absor-ptivity of 1.40×104L·mol^-1·cm^-1.The linear range of the method is 10—50μg/25mL,the correlation coefficient is 0.9991,and the detection limit is 2.4×10^-7g/mL.The method has been applied to the determination of chromium（Ⅵ ）in electroplating wastewater with RSD of no more than 0.46% and recovery of 97. 5%-104.5%.

关 键 词：铬 次甲基蓝 分光光度法 

分 类 号：O657.32[理学—分析化学]