萃取光度法测定电镀废水中的微量Cr(Ⅵ)  

Determination of Minim Chromium (Ⅵ) in Electroplating wastewater by Extraction Spectrophotometry

作　　者：徐瑞银[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《光谱学与光谱分析》2003年第6期1221-1223,共3页Spectroscopy and Spectral Analysis

摘　　要：利用二甲基吲哚羰花青(DIC)染料与Cr(Ⅵ)配合物的显色反应,对含Cr(Ⅵ)电镀废水中痕量铬(Ⅵ)进行测定。结果表明,在H_2SO_4介质中,甲苯萃取显色反应物具有高的灵敏度,反应产物的最大吸收波长为560nm;摩尔吸光系数为2.5×10~5L·mol(-1)·cm^(-1)。Cr(Ⅵ)量在0.01～2.1mg·L^(-1)范围内符合比尔定律。该法用于测定电镀废水中的铬(Ⅵ),得到了满意的结果。The chromogenic reaction of dimethylindocarbocyanine(DIC) with Cr2O72- was used to determine trace Cr(Ⅵ) in electroplating wastewater containing Cr(Ⅵ). The results show that the chromogenic reaction has high sensitivity during toluene extraction in H2SO4 medium, the maximum absorption of the system is at 560 nm, the molar absorptivity is 2.5 ×105L·mol-1·cm-1 independent from the extractant and dye, and Beer's law is obeyed for Cr(Ⅵ ) in the range of 0.01-2.1 mg·L-1 . Contents of Cr(Ⅵ) in electroplating wastewater were determined with satisfactory results.

关 键 词：电镀废水 铬(Ⅵ) 含量测定 萃取光度法 二甲基吲哚羰花青染料 显色反应 

分 类 号：X781.1[环境科学与工程—环境工程] X132