氯离子对化学需氧量的影响及屏蔽方法的研究  

Study on the influence of chloride ions on COD and masking methods

作　　者：黄梦芸 翟苏宇 罗尧森 艾观明 何玉敏 阮庭贵 陈基伟 黄世俊 HUANG Mengyun;ZHAI Suyu;LUO Yaosen;AI Guanming;HE Yumin;RUAN Tinggui;CHEN Jiwei;HUANG Shijun(Shaxian Hongsheng Plastic Co.,Ltd.,Sanming Fujian 365500,China;College of Resources and Chemical Engineering,Sanming University,Sanming Fujian 365004,China)

机构地区：[1]沙县宏盛塑料有限公司,福建三明365500 [2]三明学院资源与化工学院,福建三明365004

出　　处：《石油化工应用》2024年第1期108-114,共7页Petrochemical Industry Application

基　　金：福建省区域发展项目(2021Y3003);中央引导地方科技发展专项(2022L3050);福建省技术创新重点攻关及产业化项目(2023G020)。

摘　　要：为系统探明氯离子对化学需氧量(COD)的影响,并获得有效的屏蔽方法,降低检测误差,本文以COD标准溶液为研究对象,探讨了氯离子及硫酸汞对COD测试值的影响,实验结果显示,氯离子对COD的测试存在显著的干扰,特别是对于COD值小的样品,引起的测试误差更大。硫酸汞具有较好的屏蔽效果,在屏蔽倍率为30∶1时,对于COD≥200 mg/L的样品,其测试误差可以达到10.00%以内。对于COD≤50 mg/L的样品,采用低浓度测试条件,在屏蔽倍率为20∶1时可达到较好的屏蔽效果,但硫酸汞用量不宜过多且宜在量取试样后加入。In order to systematically explore the influence of chloride ions on COD,and obtain an effective masking method to reduce detection error.This paper takes COD standard solution as the research object,discusses the influence of chloride ion and mercury sulfate on COD test value.The experimental results show that chloride ion has significant interference on COD test,especially for samples with small COD value,resulting in greater test error.Mercury sulfate has a good masking effect,when the masking ratio is 30∶1,the test error can reach less than 10.00%for samples with COD≥200 mg/L.For samples with COD≤50 mg/L,the low concentration test condition can achieve a better masking effect when the masking ratio is 20∶1,but the amount of mercury sulfate should not be too much and should be added after measuring the sample.

关 键 词：氯离子 化学需氧量 干扰 硫酸汞 屏蔽倍率 影响因素 

分 类 号：TE991[石油与天然气工程—石油机械设备]