挥发油的化学成分。 方法用气相色谱-质谱（GC/ MS）联用技术，应用峰面积归一化法测定各组分的相对含量。
Methods The chemical components of volatile oil were analyzed by gas chromatography-mass spectraphy (GC/MS), and their relative contents were determined by peak area normalization.
对于不同的煤种，其挥发份的含量和组分是不同的。
Contents and compositions of coal volatiles are variable for different coals.
花椒中富含挥发油、植物碱、酰胺类物质等，因品种、产地的不同这些物质组分和含量有较大区别。
The main components of Zanthoxylum are volatile oils, alkaloids, amides, etc. The contents and constituents of these materials from different species or habitats are greatly different.
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