Porous Membrane-Assisted Purge and Trap Sampling for Determination of VOCs in Gas Chromatography with Needle-Type Extraction Device
Porous Membrane-Assisted Purge and Trap Sampling for Determination of VOCs in Gas Chromatography with Needle-Type Extraction Device
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DOI：
10.1007/s10337-021-04103-1
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发表时间：
2021-11
期刊：
影响因子：
1.7
通讯作者：
I. Ueta;Taiga Komatsu;K. Fujimura;Yoshihiro Saito
中科院分区：
文献类型：
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作者：
I. Ueta;Taiga Komatsu;K. Fujimura;Yoshihiro Saito
采用多孔聚四氟乙烯（PTFE）膜，通过气体而排斥水，和针型萃取装置，建立了吹扫捕集（PT）萃取-气相色谱-质谱（GC-MS）测定水样中挥发性有机化合物（VOCs）的分析方法。将PTFE膜固定在固相萃取玻璃柱中，加入10 mL水样和氯化钠。然后，将针型提取装置插入柱顶部空间，并收集顶部空间气体。由于滤芯内部的减压，吹扫气体从滤芯的底侧通过PTFE膜引入。在样品提取之后，通过将针插入加热的GC进样口来热解吸VOC。该方法对23种挥发性有机物的定量限均小于0.5 μg/L，二氯甲烷的标准曲线上限为500 μg/L，其他化合物的标准曲线上限为1000 μg/L。23种挥发性有机物的相对峰面积的相对标准偏差均小于15%（n= 5）。该方法用于自来水样品中挥发性有机物的测定。
An analytical method using a porous polytetrafluoroethylene (PTFE) membrane that passes through gas while repelling water, and a needle-type extraction device was developed for purge-and-trap (PT) extraction followed by gas chromatography–mass spectrometric (GC–MS) determination of volatile organic compounds (VOCs) in water samples. The PTFE membrane was fixed in a solid-phase extraction glass cartridge, and 10 mL of water sample and sodium chloride were added. Then, a needle-type extraction device was inserted into the cartridge headspace, and the headspace gas was collected. Due to decompression on the inside of the cartridge, purge gas was introduced from the bottom side of the cartridge through the PTFE membrane. After the sample extraction, VOCs were thermally desorbed by inserting the needle into the heated GC injection port. The limit of quantification of the proposed method for 23 investigated VOCs was less than 0.5 μg/L, and the upper limit of the calibration curve was 500 μg/L for dichloromethane and 1000 μg/L for other compounds. The relative standard deviations of the relative peak area for 23 investigated VOCs were less than 15% (n= 5). The method was used to determine VOCs in tap water samples.