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本文提出一种在质谱中直接程序升温裂解的方法(PY/MS)来考察腐植酸。结果表明,该方法在表征腐植酸上很有效。考察了来自土壤、泥炭和风化煤的八种腐植酸。根据PY/MS的结果,它们可以分为三类。第一类是米自土壤的腐植酸。它们的脱H_2O、脱CO_2及脱SO_2的过程在温度不到300℃时就已结束,并且只产生少数裂解产物。第二类来自风化煤。该类的这三个过程延续到400℃以上,但裂解产物很少。来自泥炭的腐植酸归于第三类。该类的这三个过程也延续到400℃以上,同时可见脱H_2O、脱SO_2明显存在着两个不同的阶段,并在400℃以下就产生了众多的多环烃化合物及单环芳烃化合物。
In this paper, we present a method for the direct temperature pyrolysis in mass spectrometry (PY / MS) to investigate humic acid. The results show that this method is very effective in characterizing humic acid. Eight humic acids from soil, peat and weathered coal were examined. According to the results of PY / MS, they can be divided into three categories. The first is humic acid from the soil. Their de-H 2 O, CO 2 removal and SO 2 removal processes are completed at temperatures below 300 ° C and only produce a few of the cleavage products. The second category comes from weathered coal. The three processes of this class extend over 400 ° C with little pyrolysis products. Humic acid from peat belongs to the third category. The three processes in this class also extend to more than 400 ℃. At the same time, there are obviously two different stages of de-H_2O and desorption of SO_2, and many polycyclic hydrocarbons and monocyclic aromatic hydrocarbons are produced below 400 ℃.