双波长分光光度法测定废水中痕量铬(Ⅵ)  

Dual-wavelength spectrophotometric determination of trace chromium (Ⅵ) in waste water

作　　者：陈亚红[1] 田丰收 马青青[1] 

机构地区：[1]周口师范学院化学系,河南周口466000 [2]郸城财鑫实业化工有限公司,河南郸城477150

出　　处：《冶金分析》2009年第1期67-69,共3页Metallurgical Analysis

基　　金：河南省教育厅自然科学基金资助项目(No.2008A150029)

摘　　要：在H2SO4介质中，铬（Ⅵ）与茜素蓝S（ABS）形成红色产物，据此建立了双波长分光光度法测定废水中痕量铬（Ⅵ）的新方法。测定波长为510nm，参比波长为575nm，表观摩尔吸光系数为7．4×10^4 L·mol^-1·cm^-1。方法的线性范围为0．4～1．0μg／mL，检出限为17．22ng／mL。方法用于工业废水中铬（Ⅵ）含量的测定，加标回收率为95．7％～103．2％。利用该方法分析废水中铬（Ⅵ）的含量与国家标准方法（二苯碳酰二肼分光光度法）的结果基本一致。A novel determination method of trace chromium （Ⅵ） in waste water by dual-wavelength spectrophotometry was established based on the fact that chromium （Ⅵ） can react with alizarin blue S （ABS） to form red complex in H2SO4 medium. The detected wavelength was 510 nm while the reference wavelength was 575 nm , and the apparent molar absorptivity was 7.4 ×10^4 L·mol^-1·cm^-1. The linearity range for the determination of chromium （Ⅵ） was 0.4--1.0 μg/mL, with the detection limit of 17.22 ng/mL. The proposed method has been applied to the determination of chromium （Ⅵ） in industrial waste water with the recovery of 95.7%- 103.2%. The results were in coincidence with those obtained by national standard method （diphenylcarbazide spectrophotometry）.

关 键 词：双波长分光光度法 铬(Ⅵ) 茜素蓝S 

分 类 号：O657.32[理学—分析化学]