低浓度COD测定过程中空白值偏高原因分析  

Discussion on Reasons for High Blank Value during Determination of Low Concentration COD

作　　者：戴胜杰 刘义洋 刘雯 吕高原 熊萍 郑静 李佳娇 赵芝清 DAI Sheng-jie;LIU Yi-yang;LIU Wen;LV Gao-yuan;XIONG Ping;ZHENG Jing;LI Jia-jiao;ZHAO Zhi-qing(College of Chemical and Material Engineering,Quzhou University,Zhejiang Quzhou 324000,China)

机构地区：[1]衢州学院化学与材料工程学院,浙江衢州324000

出　　处：《广州化工》2018年第19期95-97,共3页GuangZhou Chemical Industry

基　　金：衢州市科技局资助项目(2015Y012);衢州学院中青年学术骨干资助项目(XNZQN201506);衢州学院博士科研启动项目(BSJX201601);国家级大学生创新创业训练计划项目(201711488011);省级大学生科技创新活动计划暨新苗人才计划(2017R429003)

摘　　要：在实验过程中采用国家标准分析方法(GB11914-89)测定COD时,其步骤较为固定,但影响因素不确定,造成测定误差。针对低浓度COD测定过程中空白值偏高的问题,对空白测定所用的纯净水水质、加热管新旧、消解温度、显色剂浓度及新鲜程度开展了研究,实验结果表明:纯净水水质、加热管的新旧、显色剂浓度及新鲜程度对测定精度造成影响不大,而消解温度是影响测定结果的主要原因。During the detection of COD by national standard method （GB11914-89 ）, its steps are fixed, but the influence factors are uncertain, which could cause measurement error. Aiming at the high blank value during the detection of low concentration COD, the influence factors, including the water quality, the use of heating pipe, the digestion temperature, the concentration and the freshness of inaicator were analyzed. The results showed that the factors except the digestion temperature had little influence on the accuracy.

关 键 词：低浓度COD 重铬酸钾法 消解温度 

分 类 号：G718.3[文化科学—职业技术教育学] G424[文化科学—教育学]