Characterization of DOC and CDOM and their relationship in turbid waters of a high-altitude area on the western Loess Plateau, China | Zendy

Tiantian Shao | Zendy; Tao Wang | Zendy; Xiaowen Liang | Zendy; Honglian Xu | Zendy; Liuyang Li | Zendy

Open Access

Characterization of DOC and CDOM and their relationship in turbid waters of a high-altitude area on the western Loess Plateau, China

Author(s) -

Tiantian Shao,

Tao Wang,

Xiaowen Liang,

Honglian Xu,

Liuyang Li

Publication year - 2019

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2020.004

Subject(s) - colored dissolved organic matter , dissolved organic carbon , spectral slope , loess plateau , tributary , environmental science , plateau (mathematics) , environmental chemistry , absorbance , hydrology (agriculture) , chemistry , soil science , geology , nutrient , mathematical analysis , physics , cartography , mathematics , organic chemistry , phytoplankton , chromatography , geotechnical engineering , astronomy , geography , spectral line

Dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) in rivers and reservoirs on the western Loess Plateau, which is an area of severe soil erosion, were investigated in September 2017 to analyze the CDOM characteristics and composition, DOC distribution and influence of environmental factors on these parameters. Great differences of water parameters were exhibited between different groups based on the analysis of variance (p < 0.01). The results indicated that rivers exhibited higher DOC concentrations (mean: 3.70 mg/L) than reservoir waters (mean: 2.04 mg/L). Artificial and agricultural lands exert a large influence on DOC concentrations, which verifies the hypothesis that intense anthropogenic activity results in high DOC concentrations. The CDOM absorption at 350 nm [aCDOM(350)] of tributary water samples was 2.73 m−1, which was higher than that in the Yellow River (1.71 m−1) and reservoir waters (1.33 m−1). The effects of DOC, TC and turbulence (Tur) on CDOM are positive and significant (p < 0.05) according to the multiple linear regressions. An analysis of the optical characteristics of CDOM indicated that waters on the Loess Plateau contained abundant humic acid and higher levels of allochthonous DOM with a higher molecular weight (MW) based on the spectral slopes (S) and specific UV absorbance (SUVA254) values.

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