LAS废水COD_(cr)快速测定及影响因素探究  

COD_(cr) rapid determination of LAS wastewater and its influencing factors

作　　者：李大军[1] 

机构地区：[1]湖南工学院安全与环境工程学院,湖南衡阳421002

出　　处：《应用化工》2017年第5期924-927,930,共5页Applied Chemical Industry

基　　金：湖南省教育厅科学研究项目(14C0317);衡阳市科学技术发展计划项目(2015KJ31);湖南工学院校级科研项目(HY14012)

摘　　要：为了快速和准确的测量废水中的COD_(cr)值,评估阴离子表面活性剂对水质的影响,采用快速消解分光光度法测定了废水的COD_(cr),考察了SDBS与COD_(cr)的关系,以及SDBS的添加浓度、pH值、Cl^-等因素对LAS废水中COD_(cr)快速测定结果的影响。结果表明,阴离子表面活性剂SDBS与COD_(cr)值存在线性关系,在单一的SDBS溶液体系中,平均氧化1 mg的SDBS,相当于0.278 mg的COD_(cr),但在多组分的混合溶液中,SDBS对常规废水的COD_(cr)却产生负干扰,有明显的抑阻作用,使废水COD_(cr)检测值偏低,两者的线性关系在SDBS的CMC附近产生明显分界;初始p H对废水COD_(cr)的测定值基本无影响,其振幅小于1.5%;废水中Cl^-对COD_(cr)测定值有严重影响,使测定结果大大偏高,Cl-浓度在750 mg/L附近产生明显线性分界。For fast and accurate measurement in wastewater C0Dcr and evaluation of the effect of anionic surfactant on the water quality, spectrophotometric method for the determination of the COD of the wastewater by rapid digestion is applied and the relationship between C0Dcr and SDBS,and SDBS addedconcentration,pH value,Cl- and other factors on LAS waste as a result of rapid determination of C0Dcr in water is examined. The results show that there is a linear relationship between SDBS and C0Dcr anionic surfactant value in a single SDBS solution,the average oxidation for 1 mg SDBS,equivalent to 0. 278 mg C0Dcr,but SDBS and PAP in the mixed solution, the SDBS of C0Dcr has such significantly inhibitory effect on resistance as to make the C0Dcr have lower detection value and the linear relationship between the two have obvious boundary in the CMC of SDBS. Initial pH has no effect on examination of C0Dcr, with an amplitude of less than 1.5%. The Cl concentration has a serious impact on the examination of C0Dcr,and the offset and the concentration of Cl- demonstrate a good linear correlation,but Cl- in the vicinity of 750 mg/L still has obvious linear boundary.

关 键 词：化学需氧量 十二烷基苯磺酸钠 快速消解分光光度法 影响因素 

分 类 号：TQ423.1[化学工程] X832[环境科学与工程—环境工程]