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首页> 外文会议>9th International Conference on Indoor Air Quality and Climate Vol.2, Jun 30-Jul 5, 2002, Monterey, California >MULTIPLE HEADSPACE EXTRACTION GAS CHROMATOGRAPHY FOR QUANTIFICATION OF VOC'S IN CONCRETE
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MULTIPLE HEADSPACE EXTRACTION GAS CHROMATOGRAPHY FOR QUANTIFICATION OF VOC'S IN CONCRETE

机译：多种顶空萃取气相色谱法对混凝土中的挥发性有机化合物进行定量

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Concrete itself is not a source of VOC emissions of any importance. However, humid concrete is very alkaline and may cause degradation of organic materials. Concrete can also adsorb considerable amounts of volatile compounds, e.g. from degrading flooring materials. This together with the present trends in cement and concrete production (alternative fuels, new organic additives, waste materials) has made it interesting to develop rapid methods for quantification of VOCs in concrete. We have tested a multiple headspace extraction gas chromatography method to determine the VOC content of cement bound materials. The total VOC content of a sample may be calculated from repeated headspace injections. The sample incubation time and temperature were optimized for six organic compounds with different boiling points and polarity. The method is tested on samples with known additions of these six organic compounds. The method works well on relatively dry samples, but there are problems with over-pressure in the headspace vial from water vapor in humid samples.
机译：混凝土本身不是任何重要的VOC排放源。但是，潮湿的混凝土碱性很高，可能导致有机材料降解。混凝土还可以吸收大量的挥发性化合物，例如从降解地板材料。这与水泥和混凝土生产中的当前趋势（替代燃料，新型有机添加剂，废料）一起，使得开发快速定量混凝土中VOC的方法变得有趣。我们已经测试了多种顶空萃取气相色谱法，以确定水泥粘结材料的VOC含量。样品的总VOC含量可通过重复顶空进样来计算。针对六个沸点和极性不同的有机化合物，优化了样品的孵育时间和温度。在添加了这六种有机化合物的已知样品上测试了该方法。该方法在相对干燥的样品上效果很好，但是在潮湿样品中，顶空样品瓶中的水蒸气会产生过压问题。

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