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目的:研究用GC-MS对有机蒸汽进行定性及半定量测定的方法。方法:研究样品储存、样品温度、取样高度到包括柱流量、柱温、程序升温、分流比等仪器条件对测定灵敏度的影响,确定了优化条件。并在此条件下研究了常见VOCs的检测线性范围与检出限,测定了68种常见有机物的灵敏度。探讨了GC-MS定性分析的方法、容易出现的问题及解决办法。结果:获得一套GC-MS定性、定量分析有机蒸汽的测定方法,半定量测定方法与VOCs的国家标准方法一起对实际有机溶剂样品的顶空气体进行了对比测定,获得了满意的结果。结论:对蒸汽的组成与浓度一无所知情况下,该方法可以给出可靠的定性分析及相对准确的半定量检测结果,是多种环境下发现VOCs种类并确定其大致浓度水平的重要手段。
Objective: To study the method of qualitative and semi-quantitative determination of organic vapor by GC-MS. Methods: The effects of instrument storage conditions, sample temperature and sampling height on determination sensitivity including column flow, column temperature, programmed temperature and split ratio were studied. The optimal conditions were determined. Under these conditions, the linear range and the detection limit of VOCs were studied. The sensitivities of 68 common organic compounds were determined. The methods of qualitative analysis of GC-MS, the problems that easily appear and the solutions are discussed. Results: A set of GC-MS method for qualitative and quantitative analysis of organic vapor was obtained. The semi-quantitative determination method was compared with the national standard method of VOCs to determine the headspace gas of real organic solvent samples. Satisfactory results were obtained. Conclusions: With no knowledge of the composition and concentration of steam, the method can provide reliable qualitative analysis and relatively accurate semi-quantitative test results, which is an important means to discover the types of VOCs and determine the approximate concentration level of VOCs in a variety of environments .