Exploring the Pollution Characteristics of Dissolved Organic Matter in the Primary Tributaries of the Dongjiang River

LIU Qi, JIANG Yuan, DING Jiao, HOU Zhao-jiang, FU Lan

JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (7) : 1231-1240.

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JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (7) : 1231-1240. DOI: 10.11849/zrzyxb.20150803
Resource Evaluation

Exploring the Pollution Characteristics of Dissolved Organic Matter in the Primary Tributaries of the Dongjiang River

  • LIU Qi1, 2, JIANG Yuan1, 2, DING Jiao2, HOU Zhao-jiang2, FU Lan3
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Abstract

Dissolved organic matter (DOM) is an important component of natural water, and its composition and content can reflect the pollution characteristics of rivers. We assessed the components of DOM from eight primary tributaries of the Dongjing River sampled from March to April, 2014 using excitation-emission matrix (EEM) fluorescence. Two humic-like DOMs (Peak A and B) and two protein-like DOMs (Peak C and D) were found by peak-picking method and PARAFAC method. We used these four components, combining with water quality parameters, to explore the pollutant sources of each tributary. The results showed that: 1) The content of two protein-like components in Danshui River and Shima River was significantly higher than in other tributaries, and two humic-like components were missing in these two rivers. 2) The protein-like components (Peak C and D) showed strong correlations with general water quality parameters (P<0.05). 3) The tributaries located in upper and middle reaches of the Dongjing River were polluted slightly, the habitat conditions being good. The contents of the humic-like and protein-like components in the tributaries located in the middle reach were significantly high due to the pollutants from industries and agriculture. There was no humic-like components in the tributaries located in lower reach, but the protein-like components increased significantly, as a result of destruction of natural habitat and industrial wastewater discharges. 4) Like the estuary of the Pearl River and the Taizi River in the Liaohe River Basin, the tributaries of Dongjing River had high concentration of protein-like components, which is quite different from the Changjiang River and foreign rivers. This indicated that the human-caused organic pollution is serious in the Dongjing River.

Key words

dissolved organic matter (DOM) / Dongjiang River / excitation-emission matrix (EEM) fluorescence / PARAFAC method

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LIU Qi, JIANG Yuan, DING Jiao, HOU Zhao-jiang, FU Lan. Exploring the Pollution Characteristics of Dissolved Organic Matter in the Primary Tributaries of the Dongjiang River[J]. JOURNAL OF NATURAL RESOURCES, 2016, 31(7): 1231-1240 https://doi.org/10.11849/zrzyxb.20150803

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Funding

National Science and Technology Major Project: Water Pollution Control and Management Technology of China, No.2012ZX07501002-04 ;National Natural Science Foundation of China, No.41271104
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