Studies of Thermal Transformations of Humic and Fulvic Acids in Soils I. Infrared Spectroscopy and Temperature-Programmed Pyrolysis Mass Spectrometry |
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Authors: | Tao Zuyi Liu Shifang Zhai Jianjun Sheng Fenling |
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Institution: |
a Department of Modern Physics, Analysis and Testing Centre, Lanzhou University, Lanzhou, P.R. China |
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Abstract: | Temperature-programmed pyrolysis mass spectrometry and Fourier-transform infrared spectroscopy have been used to monitor structural changes of humic and fulvic acids isolated from soils in China, in the temperature range of 25-550°C. in this work, we found that decarboxylation is obvious as the main reaction with dehydration reaction from 150°C to 400°C, the anhydride can be identified from FT-IR spectra at temperature range from 200°C to 400°C; there are evident changes of the aromatic nucleus of humic and fulvic acids above 400°C, even remaining up to 550°C. Besides, some changes of adsorption water can be distinguished before 200°C, and the mass signal of sulphur dioxide was detected. |
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Keywords: | Thermal transformation humic acid (HA) fulvic acid (FA) infra-red pyrolysis mass spectrometry |
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