电位滴定法测定制革废水化学需氧量的实验设计  

Experimental design on the determination of COD in tannery wastewater by automatic potentiometric titration

作　　者：王忠辉[1,2] 卜扬龙 谭地华 宋庆双[1,2] 戴红 WANG Zhonghui;BU Yanglong;TAN Dihua;SONG Qingshuang;DAI Hong(National Engineering Laboratory for Clean Technology of Leather Manufacture,Ministry of Education,Sichuan University,Chengdu 610065,China;Key Laboratory of Leather Chemistry and Engineering,Ministry of Education,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学制革清洁技术国家工程研究中心,四川成都610065 [2]四川大学皮革化学与工程教育部重点实验室,四川成都610065

出　　处：《实验室科学》2023年第4期6-9,13,共5页Laboratory Science

基　　金：第二批国家级新工科研究与实践项目(项目编号:E-HGZY20202024);四川大学实验技术立项(项目编号:2019)。

摘　　要：建立了密闭氧化消解-自动电位滴定测定化学需氧量COD的方法,并对所建立方法的准确度、精密度进行了评估。将此方法应用于制革废水COD的测定,在加标回收实验中,加标30 mg/L的试样,回收率为94.453%,加标60 mg/L的试样,回收率为105.132%。将建立的新方法与国标法进行了对比,实验发现,两种方法的相对标准偏差都在3%以内。因此所建立的方法是可行的,该方法能够应用于实践研究,且操作方便,节约试剂,效率高,避免肉眼目测对测定结果带来的主观误差,使测定结果更加客观准确。在此实验过程中,提高了学生的动手实践能力,培养了学生的主观能动性,激发了学生对科研的兴趣。To measure Chemical Oxygen Demand(COD)in tanning industrial wastewater,a closed oxidation digestion-automatic potentiometric titration method was established.Meanwhile,the precision and accuracy of the method was evaluated.Then,the established method was applied to the determination of COD in leather wastewater.The recovery of the sample spiked with the original 30 mg/L was 94.453%,and the recovery of the sample spiked with 60 mg/L was 105.132%.Finally,the result demonstrated relative standard deviations of the new method and the national standard method were within 3%.Thus,the established method was feasible.Due to the advantage of the simple operation,low reagent consumption,high efficiency,avoiding subjective error caused by visual measurement,the established method can be applied to practical research.In this experiment,the students,practical ability is improved,their subjective initiative is cultivated,their interest in scientific research is aroused.

关 键 词：密闭氧化消解 自动电位滴定 化学需氧量 制革废液 

分 类 号：TS541[轻工技术与工程—皮革化学与工程]