室内空气总挥发性有机物检测的热解吸参数优化  

Optimization of thermal desorption parameters during indoor air total volatile organic compound detection

作　　者：李孜军[1] 孙瑞雪[1] 

机构地区：[1]中南大学资源与安全工程学院,长沙410083

出　　处：《环境工程学报》2012年第10期3689-3692,共4页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51074181)

摘　　要：总挥发性有机物(TVOC)是评价室内空气质量最重要的指标。为了提高TVOC检测的准确度,选取解吸气流量、热解吸温度、进样时间和热解吸时间四项因素设计正交实验,以热解吸率作为指标,对TVOC的热解吸过程进行了优化。并讨论在优化后参数的控制下,TVOC各组分的检测准确度。实验结果表明,优化的热解吸条件下各参数指标分别为解吸气流量40 mL/min、热解吸温度280℃、进样时间120 s、热解吸时间30 s。检测准确度的结果表明,在优化热解吸参数的控制下,各组分的回收率在90.3%～97.3%之间,满足TVOC的实际检测需求。Total volatile organic compound（TVOC） is the most important index of indoor air quality evaluation.The purpose of this study is to optimize the thermal desorption conditions and to improve accuracy of TVOC detection.The thermal desorption parameters such as gas feed rate,temperature,periods of sampling and desorption were evaluated through orthogonal experiments based on thermal desorption rate.The detection accuracy for different groups of TVOC was also inspected under optimized thermal desorption conditions.The results indicated that the optimal conditions of thermal desorption were as follows： gas feed rate of 40 mL/min,thermal desorption temperature of 280℃,period of sampling of 120 s,and period of desorption of 30 s.Under optimized thermal desorption conditions,recovery rates for different groups of TVOC were between 90.3% and 97.3%,which can meet actual demand of TVOC detection.

关 键 词：TVOC 热解吸率 优化 准确度 

分 类 号：X851[环境科学与工程—环境工程]