Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.
J Am Chem Soc. 2011 Oct 26;133(42):16786-9. doi: 10.1021/ja207718t. Epub 2011 Oct 3.
A disposable preoxidation technique that dramatically improves the detection and identification of volatile organic compounds (VOCs) by a colorimetric sensor array is reported. Passing a vapor stream through a tube packed with chromic acid on silica immediately before the colorimetric sensor array substantially increases the sensitivity to less-reactive VOCs and improves the limits of detection (LODs) ~300-fold, permitting the detection, identification, and discrimination of 20 commonly found indoor VOC pollutants at both their immediately dangerous to life or health (IDLH) and permissible exposure limit (PEL) concentrations. The LODs of these pollutants were on average 1.4% of their respective PELs.
报道了一种一次性预氧化技术,该技术通过比色传感器阵列显著提高了挥发性有机化合物(VOC)的检测和识别能力。将蒸气流通过填充在二氧化硅上的铬酸管,在比色传感器阵列之前立即进行,这大大提高了对反应性较低的 VOC 的灵敏度,并将检测限(LOD)提高了约 300 倍,从而能够检测、识别和区分 20 种常见的室内 VOC 污染物,其浓度分别为立即威胁生命或健康(IDLH)和允许暴露极限(PEL)。这些污染物的 LOD 平均为各自 PEL 的 1.4%。