title: [Using ultraviolet-visible ( UV-Vis) absorption spectrum to estimate the dissolved organic matter (DOM) concentration in water, soils and sediments of typical water-level fluctuation zones of the Three Gorges Reservoir areas].
abstract: Dissolved organic matter (DOM) is a very important component in terrestrial ecosystem. Chromophoric dissolved organic matter (CDOM) is a significant constituent of DOM, which can be measured by ultraviolet-visible (UV-Vis) absorption spectrum. Thus the relationship between CDOM and DOM was investigated and established by several types of models including single-wavelength model, double-wavelength model, absorption spectrum slope (S value) model and three-wavelength model, based on the UV-Vis absorption coefficients of soil and sediment samples (sampled in July of 2012) and water samples (sampled in November of 2012) respectively. The results suggested that the three-wavelength model was the best for fitting, and the determination coefficients of water, soil and sediment data were 0. 788, 0. 933 and 0. 856, respectively. Meanwhile, the nominal best model was validated with the UV-Vis data of 32 soil samples and 36 water samples randomly collected in 2013, showing the RRMSE and MRE were 16. 5% and 16. 9% respectively for soil DOM samples, 10. 32% and 9. 06% respectively for water DOM samples, which further suggested the prediction accuracy was higher in water DOM samples as compared with that in soil DOM samples.
authors.forename: Lu-lu
authors.initials: LL
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.forename: Song
authors.initials: S
authors.lastname: Lu
authors.forename: Jin-long
authors.initials: JL
authors.lastname: Yan
authors.forename: Jie
authors.initials: J
authors.lastname: Gao
authors.forename: Shi-qiang
authors.initials: SQ
authors.lastname: Wei
authors.forename: Ding-yong
authors.initials: DY
authors.lastname: Wang
authors.forename: Nian
authors.initials: N
authors.lastname: Guo
authors.forename: Zhena
authors.initials: Z
authors.lastname: Zhao
mesh_terms: D002681:China; D005618:Fresh Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D008962:Models, Theoretical; D009930:Organic Chemicals / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods; D014466:Ultraviolet Rays
chemical_list: D009930:Organic Chemicals; D012987:Soil