摘要
用固态13C核磁共振(NMR)检测了富含有机质的Indonesia、Okefenokee、Everglades 3种泥炭土中的腐殖质提取物,特别是腐植酸,证明它们是泥炭的组成成分,这与认为腐殖质是碱提取的人工制品的观点相反。通过重组不同的腐殖质组分(腐黑物、腐植酸和黄腐酸),并将重组后的泥炭与原始未处理的泥炭样品的NMR波谱进行比较,证明了腐殖质的真实性。尽管固态13C NMR波谱指出了腐植酸和不溶性腐黑物组分之间存在显著的结构差异,但重组方法很好地再现了原始未提取的泥炭。将生物聚合物混合模型应用于固态13C NMR波谱后揭示出腐植酸含有很高比例的炭状物质,这被解释为来自腐殖化过程中的非燃烧聚合或二次合成,这一过程受到了土壤形成模型的挑战。
Humic extracts,in particular humic acids,of organic-rich peat soils were examined by solidstate 13C nuclear magnetic resonance(NMR)and shown to be integral components of the peat,contrary to recent suggestions that humic materials are artifacts of alkali extraction.The authenticity of humic substances is demonstrated by recombining the various humic fractions and comparing the NMR spectrum of the recombined peat with the original untreated peat sample.Even though significant NMR-determined structural differences exist between humic acids and the insoluble humin fractions,the recombination reproduces the original unextracted peat quite well.Applying a biopolymer mixing model to the spectra shows that humic acids have a high proportion of char-like material that is interpreted as being derived from noncombustion polymerization or secondary synthesis during humification,a process that has been challenged by a recent soil formation model.
出处
《腐植酸》
CAS
2023年第5期70-76,共7页
Humic Acid
关键词
腐植酸
腐黑物
碱提取物
炭
humic acids
humin
alkali extracts
char
