基于单光子电离飞行时间质谱技术的船载走航VOCs监测方法
Ship-mounted monitoring method of VOCs based on single photon ionization time-of-flight mass spectrometry
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摘要: 基于自主研制的真空紫外单光子电离飞行时间质谱仪(SPI-MS),建立了一套直接进样与快速检测水中挥发性有机污染物(VOCs)的系统。结果表明:苯、甲苯、二甲苯和氯苯在5~40 μg/L范围内具有良好的线性,且检测限分别为0.311 9 μg/L、0.713 3 μg/L、0.056 0 μg/L、0.169 7 μg/L,满足《地表水环境质量标准》(GB 3838—2002)对该4种物质快速检测的要求。将该系统应用于华北地区某水域中VOCs的在线检测,共检测到13种VOCs。船载走航质谱技术监测范围大、响应迅速,能够及时反应水中VOCs的污染分布情况和特征,在水中VOCs的连续在线监测方面具有广阔的发展潜力。
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关键词:
- 水中挥发性有机污染物 /
- 在线监测 /
- 船载 /
- 单光子电离飞行时间质谱仪
Abstract: Based on independently-developed vacuum ultraviolet single photon ionization time-of-flight mass spectrometer (SPI-MS), a system was developed for the rapid detection of volatile organic compounds (VOCs) in water with direct injection. The results showed that the linearity was good in the range of 5~40 μg/L for benzene, toluene, xylene and chlorobenzene, and the detection limits were 0.311 9 μg/L, 0.713 3 μg/L 0.056 0 μg/L and 0.169 7 μg/L respectively,which met the requirements of the Environmental Quality Standard for Surface Water (GB 3838-2002) for the rapid detection of these four substances. The instrument was applied to the online detection of VOCs in a water area in North China, and a total of 13 VOCs substances were detected. With a large monitoring range and rapid response, the ship-mounted SPI-MS could respond to the distribution and characteristics of VOCs pollution in water in a timely manner, and had broad development potential in the continuous on-line monitoring of VOCs in water. -
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