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于1992－1993年用1H－NMR，13C－NMR和IR等分析技术对甲基化前后的海水腐植质（1992年从青岛近岸海水中吸附提取）的基本化学组成和结构特征进行研究，并与风化煤和海洋沉积物中的腐植质作比较。结果表明，IR和1H－NMR谱图显示，海水腐植质主要由脂肪链化合物组成，含有一定量的肽类和多糖，芳香结构较少。采用NNE技术的13C－NMR谱图中各类碳的相对含量为：脂肪族碳，33．2％；脂肪族连氧、氮碳，16．3％；多羟基碳，33．7％；芳香碳和连氧芳香碳，7．5％；醌基和羰基碳，9．3％。
In 1992-1993, the basic chemical composition and structural characteristics of seawater humic substances before and after methylation (adsorbed and extracted from Qingdao coastal seawater in 1992) were studied by 1H-NMR, 13C-NMR and IR, etc. Compare with humus in weathered coal and marine sediments. The results showed that IR and 1H-NMR spectra showed that sea humus mainly consisted of fatty-chain compounds and contained a certain amount of peptides and polysaccharides with less aromatic structure. The 13C-NMR spectrum of the NNE technique showed that the relative contents of various types of carbons were: aliphatic carbon, 33.2%; aliphatic oxygen, nitrogen and carbon, 16.3%; polyhydroxy carbon, 33.7%; aromatic Carbon and oxygen-linked aromatic carbon, 7.5%; Quinone and carbonyl carbon, 9.3%.