Correlation between molecular absorption spectral slope ratios and fluorescence humification indices in characterizing CDOM
Correlation between molecular absorption spectral slope ratios and fluorescence humification indices in characterizing CDOM
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DOI：
10.1007/s00027-010-0164-5
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发表时间：
2011-02-01
期刊：
影响因子：
2.4
通讯作者：
Qin, Yanwen
中科院分区：
文献类型：
--
作者：
Chen, Hao;Zheng, Binghui;Qin, Yanwen
在表征三种腐殖酸和 44 个全水样中的发色溶解有机物 (CDOM) 时，比较了紫外-可见吸收光谱斜率 S-R（275-295 nm 的斜率除以 350-400 nm 的斜率）和腐殖化指数（HIX，435-480 nm 的积分荧光发射除以 435-480 和 300-345 nm 的荧光发射）。 HIX 随着腐殖酸 pH 值的增加而增加，而它们的 S-R 对 pH 值的依赖性表现出更复杂的依赖性。 S-R与HIX呈负相关。 S-R按陆地煤/泥炭<陆地土壤/河流<海水的顺序增加，而HIX按海水<陆地土壤/河流<陆地煤/泥炭的顺序增加。这项工作的比较研究表明，陆地来源的 CDOM 比海洋 CDOM 具有更高的 HIX 和更低的 S-R。研究人员可能会使用这两个指数来定性比较不同来源（例如陆地与海洋）中 CDOM 的特征。
Ultraviolet-visible absorption spectral slope ratios S-R (slope in 275-295 nm divided by slope in 350-400 nm) and humification index (HIX, integrated fluorescence emission in 435-480 nm divided by that in 435-480 and 300-345 nm) were compared when characterizing chromophoric dissolved organic matter (CDOM) in three humic acids and 44 whole water samples. HIX increased with increasing pH for humic acids, while their S-R showed much more complicated dependencies on pH. There was a negative correlation between S-R and HIX. S-R increased in the order terrestrial coal/peat < terrestrial soil/river < seawater, while HIX increased in the order seawater < terrestrial soil/river < terrestrial coal/peat. The comparative study in this work indicates that terrestrially derived CDOM has higher HIX and lower S-R than marine CDOM. Investigators may potentially use these two indices to compare qualitatively the character of CDOM in different sources (e.g., terrestrial vs. marine).