二苯碳酰二肼分光光度法测定PCB废水中六价铬  

Determination of Hexavalent Chromium in PCB Waste Water by 1,5-Diphenylcarbonydrazide Spectrophotometric

作　　者：韩超 孙国娟 HAN Chao;SUN Guojuan(Anhui National Copper,Lead,Zinc and Product Quality Supervision and Inspection Center,Tongling,Anhui 244000,China)

机构地区：[1]安徽国家铜铅锌及制品质量监督检验中心

出　　处：《中国无机分析化学》2019年第4期16-18,共3页Chinese Journal of Inorganic Analytical Chemistry

摘　　要：通过添加高锰酸钾去除了废水中一些还原性物质的干扰,选用磷酸作为提供氢离子的介质,大大掩蔽了铁(Ⅲ)对实验的影响,改变显色剂的配制方法,提高了显色剂的稳定性,建立了二苯碳酰二肼分光光度法测定PCB废水中六价铬的方法。改进后测定结果的相对标准偏差小于1.5%,加标回收率为98.8%~100%,方法过程简单,分析速度快,为PCB废水中六价铬的测定提供了新的思路。A spectrophotometric method for the determination of hexavalent chromium in PCB wastewater by diphenylcarbazide was established by eliminate the interference of reducing substances in the waste water through adding potassium permanganate,to select phosphoric acid as the media of supplying hydrogen ion,which significantly reduces the impact of iron(Ⅲ)to the experiment.The relative standard deviation of the improved method is less than 1.5%and the recovery rate is 98.8%-100%.The method is simple and fast,which provides a new idea for the determination of hexavalent chromium in PCB wastewater.

关 键 词：PCB废水 六价铬 二苯碳酰二肼 分光光度法 

分 类 号：O657.32[理学—分析化学] TH744.12[理学—化学]