用胡椒基荧光酮高灵敏光度法测定电镀废水中的痕量Cr(Ⅵ)  

Determination of Trace Chromium(Ⅵ) in Electroplating Wastewater by Spectrophotometry with Piperonal Fluorescence Ketone

作　　者：彭荣华[1] 李晓湘[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《材料保护》2006年第10期84-85,共2页Materials Protection

摘　　要：在表面活性剂溴化十六烷基三甲铵(CTMAB)存在下,铬(Ⅵ)与胡椒基荧光酮(PIF)在pH=9.5的NH4Cl-氨水缓冲溶液中形成蓝色配合物,其表观摩尔吸光系数为1.31×105L/(mol·cm),最大吸收波长为600nm,配合物的组成比为铬(Ⅵ)胡椒基荧光酮=12。铬(Ⅵ)含量在0～42μg/L范围内符合比尔定律,铬(Ⅵ)的标准加入回收率在95.5%～106.1%之间。利用该法测定电镀废水中的痕量铬(Ⅵ),得到了满意的效果。In the buffer solution of NH_4 Cl-ammonia with a pH value of 9.5, Cr(Ⅵ) reacts with piperonal fluorescence ketone to form a blue complex in the presence of surface active agent CTMAB. Thus a method to determine trace Cr(Ⅵ) in electroplating wastewater was established accordingly. It was found that the blue complex had a maximum absorption at 600 nm and an apparent molar absorptivity of 1.31×10 5 L/(mol·cm). The molar ratio of Cr(Ⅵ) to piperonal fluorescence ketone in the complex was 1:2 . Moreover, Beer’s law was obeyed for Cr(Ⅵ) in the range of 0～42 μg/L, and the recovery of the standard addition of Cr(Ⅵ) was as much as 95.5%～106.1%. In general, the trace Cr(Ⅵ) in electroplating wastewater could be readily and accurately determined using the established method.

关 键 词：铬(Ⅵ) 电镀废水 胡椒基荧光酮 分光光度法 测定 

分 类 号：X781.1[环境科学与工程—环境工程] X832