这些年来，凭借着气相色谱分析技术和质谱分析技术，科学家已经鉴定出来了能有规律的从人体排出或者挥发出的超过3,000种化合物。
Using gas chromatography and mass spectrometry, researchers have, over the years, identified more than 3,000 compounds that are regularly exhaled, excreted or exuded from the body.
同时对产物用红外光谱、质谱及气相色谱分析进行了表征。
The product was purified and characterized by gas chromatography, mass spectrograph and infrared spectroscopy.
目的：建立测定水中烷基酚的气相色谱-质谱分析方法。
Objective: to develop a method for analysis of alkylphenols in water by gas chromatography-mass spectrometry.
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