1.华中农业大学 资源与环境学院 农业部长江中下游耕地保育重点实验室,湖北 武汉 430070
2.中国石油大学(北京) 化学工程与环境学院 重质油国家重点实验室,北京 102249
郝蓉,博士,副教授,研究方向:环境化学,E-mail:haorong@mail.hzau.edu.cn
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周雅茹,郝蓉,伍玉鹏等.丹江口水库土壤和水体溶解性有机质的分子结构特征分析[J].分析测试学报,2023,42(03):283-291.
ZHOU Ya-ru,HAO Rong,WU Yu-peng,et al.Molecular Structures Analysis of Dissolved Organic Matter in Soil and Water of Danjiangkou Reservoir[J].Journal of Instrumental Analysis,2023,42(03):283-291.
周雅茹,郝蓉,伍玉鹏等.丹江口水库土壤和水体溶解性有机质的分子结构特征分析[J].分析测试学报,2023,42(03):283-291. DOI: 10.19969/j.fxcsxb.22111504.
ZHOU Ya-ru,HAO Rong,WU Yu-peng,et al.Molecular Structures Analysis of Dissolved Organic Matter in Soil and Water of Danjiangkou Reservoir[J].Journal of Instrumental Analysis,2023,42(03):283-291. DOI: 10.19969/j.fxcsxb.22111504.
采用傅里叶变换离子回旋共振质谱(FT-ICR MS)分析了丹江口水库土壤和水体溶解性有机质(DOM)的分子结构特征,得到土壤和水体DOM的化合物类型分布、等效双键数及碳数分布特征。结果表明:该区土壤DOM由CHO、CHOS,1,、CHON,1,、CHON,2,、CHON,3,和CHON,1,S,1, 6类化合物组成,其中以CHO类为主,该类化合物的主要组分为木质素;DOM分子的芳香性结构主要与CHO和CHON,1,类化合物有关;低氧原子数和高氧原子数的特征分子均含有芳香结构。该区水体DOM的化合物组成与土壤相似,但不同种类化合物的占比在两者之间表现不同;芳香类化合物的组成与土壤相似,主要也与CHO和CHON,1,类物质有关;低氧原子数的特征分子大多为支链结构,从O,4,分子开始含有较多的羧基和芳香结构。该研究为深入理解不同生态系统DOM的分子结构特征提供了一定的理论依据。
Fourier transform-ion cyclotron resonance mass spectrometry(FT-ICR MS) was applied to the analysis of the molecular structure characteristics of dissolved organic matter(DOM) in soil and water of Danjiangkou Reservoir in this paper.The compound type distribution,equivalent double bond number and carbon number distribution of soil and aquatic DOM were obtained.The results showed that the soil DOM was composed of 6 classes of compounds,i.e. CHO,CHOS,1,,CHON,1,,CHON,2,,CHON,3, and CHON,1,S,1,,of which the CHO class was the most abundant,and the major part of this class was lignin.Meanwhile,the aromatic structures of soil DOM were mainly related to CHO and CHON,1, class compounds.The molecules with low and high oxygen atoms were likely to contain aromatic structures,while the constituent of aquatic DOM was similar to that of soil,but the ratio of each class among 6 classes was different between both of them.The major parts of CHO class species of aquatic DOM were also lignin.Aromatic structure was also mainly related to CHO and CHON,1, class compounds.The molecules with low oxygen atoms were likely to contain branched chain structures,while the molecules of oxygen atoms from 4 to 19 contain more carboxyl and aromatic structures.This study provided convincing evidence for better understanding the DOM molecular structure from different ecosystems.
溶解性有机质土壤水体傅里叶变换离子回旋共振质谱(FT-ICR MS)
dissolved organic mattersoilwaterFourier transform-ion cyclotron resonance mass spectrometry(FT-ICR MS)
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