DIC检测装置的研制  

The Device for the Determination of Dissolved Inorganic Carbon in Water

作　　者：吴以赢[1] 汪福顺[1] 姚臣谌[1] 顾斌[1] 梅航远[1] 

机构地区：[1]上海大学环境与化学工程学院,上海200444

出　　处：《地球与环境》2011年第1期125-129,共5页Earth and Environment

基　　金：国家自然基金项目(40873066);上海市青年科技启明星计划(08QA14029);环境地球化学国家重点实验室开放基金;上海市重点学科(第三期)资助(项目号S30109)

摘　　要：水体中溶解无机碳(DIC)浓度是水质监测的重要参数。国际上一般用盐酸滴定法来检测水体中DIC浓度。但是该方法存在一定的局限性,如水体中含硼酸盐、有机碱类等物质或者分析人员的分析技能有限等都会使盐酸滴定误差变大。本研究设计制作了一套快速反应-监测系统。该方法将水样中DIC反应转化为CO2气体进行监测。通过实验模拟了天然水中的DIC浓度变化范围,结果表明:以浓度为1,2,3,4,5mmol/L的Na2CO3标准溶液作为试样时,系统的平衡时间在6～10min内,且相对误差均在±1%内,标准偏差小于0.02,说明该方法有较高的精确性和稳定性,为水体DIC含量的现场检测提供了一种快速准确的方法。The concentrations of dissolved inorganic carbon （DIC） in water are an important parameter for water quality monito- ring strategy. Generally, DIC concentrations are determined by hydrochloric acid titration. However, this method also can bring about some uncertainties when water samples contain borate or organic bases, or in case that the analyst lacks experience. In this paper we designed a rapid response system, which translates DIC in water samples into C（）2 gas for DIC determination. We used the1,2,3,4,5 mmol/L Na2CO3 standard solution to cover the range of DIC concentrations in natural water. Our re- suits showed that this system has a balance time of 6-10 minutes, and the relative errors are within ±%, with the standard deviation being less than 0.02. These results indicate that our method is of high accuracy and stability, which serves as a fast and accurate method for the determination of DIC in all kinds of water.

关 键 词：DIC 检测方法 CO2 平衡时间 

分 类 号：O65[理学—分析化学]