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继长链三醇化合物(1,20,21-C_(29))在部分沉积物和淡水蕨类植物中检出后,本文在南海北部Site4B岩芯沉积物中检出了与1,20,21-C_(29)三醇不同羟基位置和碳链长度的新的长链三醇同系物(1,3,4-C_(27-29)).通过对其分子分布和单体碳同位素测试发现1,3,4-C_(29)三醇与n-C_(26-30)偶碳长链脂肪醇含量具有良好相关性,R2(n=68)分别为0.905、0.929和0.903,并且碳同位素组成(–32.3±1.9‰)与n-C_(26-30)偶碳长链脂肪醇(分别为-29.13±0.87‰、-32.98±1.28‰和-32.98±1.28‰)较为接近.Site4B岩芯沉积物中1,3,4-C_(29)三醇和陆源长链脂肪醇(n-C_(26-34))在整个剖面中的分布趋势高度一致,可以作为陆源输入的替代性指标.鉴于以往研究1,20,21-C_(29)三醇专属于满江红属(Azolla)淡水蕨类植物,此次报道的1,3,4-C_(27-29)三醇可能具有相似的生物来源,通过对其生源区及生长环境的判定可以为南海北部陆源输入途径和来源提供潜在的有机地球化学依据.
After some long-chain triol compounds (1, 20, 21-C_ (29)) were detected in some sediments and freshwater ferns, The new long-chain triol homologue (1,3,4-C_ (27-29)) with different hydroxyl positions and carbon chain lengths of 21-C_ (29) triols was successfully synthesized by its molecular distribution and monomer carbon isotope test It was found that there was a good correlation between the content of 1,3,4-C_ (29) triol and the long-chain n-C_ (26-30) long-chain fatty alcohol and the R2 (n = 68) were 0.905,0.929 and 0.903 respectively. The isotopic composition (-32.3 ± 1.9 ‰) is closer to n-C_ (26-30) even-chain long-chain fatty alcohols (-29.13 ± 0.87 ‰, -32.98 ± 1.28 ‰ and -32.98 ± 1.28 ‰, respectively) The distribution trend of 1,3,4-C_ (29) triol and terrigenous long-chain fatty alcohol (n-C_ (26-34)) in the core sediments was highly consistent across the whole sediment and could be used as a surrogate marker for terrestrial input. In view of the previous studies 1,20,21-C_ (29) triol belongs to Azolla freshwater fern, the reported 1,3,4-C_ (27-29) triol may have similar biological According to the determination of their source area and growth environment, it can be used as the input source and source of terrestrial sources in the northern South China Sea Potential organic geochemistry basis.