摘要
引用对室内空气中微量苯和TVOC的检测原理,利用TenaxTA吸附剂吸附浓缩二氧化碳中微量苯,提高进入色谱分析系统的苯的绝对量。从而大大提高了气相色谱仪的方法检测灵敏度,实现食品级二氧化碳中痕量苯的分析,其最小的检测浓度为0.37×10-9mol/mol。实验表明,测试方法重复性较好,相对标准偏差<5%,线性相关系数>0.9999。
Applying in the principle of detection of trace benz^ne in indoor air and TVOC, and utilizing the Tenax TA as adsorbent for concentrating the trace benzene in carbon dioxide, the absolute mass of benzene in chromatographic system was improved. Simultaneously, the detection sensitivity of gas chromatograph was enhanced, and capable of detecting limit- ed benzene concentration was 0.37 ×10^-9mol/mol in carbon dioxide for food. Tests indicate that this method could achieve good repeatability, RSD was below 5 % and linear correlation ceoffieient was above 0.9999.
出处
《低温与特气》
CAS
2009年第6期40-41,45,共3页
Low Temperature and Specialty Gases
基金
上海市科学技术委员会资助课题(08142201900)
关键词
热解吸
气相色谱
痕量苯
thermal desorption
gas chromatograph
trace benzene
