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Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China

KCl-extractable sediment dissolved organic nitrogen (KS-DON) extracted from sediments near drinking water intakes of six drinking water sources in Taihu Lake in China was partitioned into hydrophobic and hydrophilic fractions and high/low molecular weight fractions. The results showed that the total...

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Autores principales: Yang, Xiaofan, Wei, Xueyu, Xu, Xiaoping, Zhang, Yu, Li, Jincheng, Wan, Jie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6466175/
https://www.ncbi.nlm.nih.gov/pubmed/30875848
http://dx.doi.org/10.3390/ijerph16060929
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author Yang, Xiaofan
Wei, Xueyu
Xu, Xiaoping
Zhang, Yu
Li, Jincheng
Wan, Jie
author_facet Yang, Xiaofan
Wei, Xueyu
Xu, Xiaoping
Zhang, Yu
Li, Jincheng
Wan, Jie
author_sort Yang, Xiaofan
collection PubMed
description KCl-extractable sediment dissolved organic nitrogen (KS-DON) extracted from sediments near drinking water intakes of six drinking water sources in Taihu Lake in China was partitioned into hydrophobic and hydrophilic fractions and high/low molecular weight fractions. The results showed that the total dissolved nitrogen (TDN) contents of the extracts ranged from 67.78 to 128.27 mg/kg. KS-DON was the main TDN species, accounting for more than 50%, with NH(4)(+)-N and NO(3)(−)-N averaging 30% and 20%, respectively. The molecular weight fractions of <1 kDa accounted for almost half of KS-DON. Hydrophilic compounds accounted for more than 75% of KS-DON. Three fluorescence peaks were identified: soluble microbial byproducts (A); protein-like substances (B); and humic acid-like substances (C). It is concluded that the KS-DON in Taihu Lake sources has higher bioavailability and higher risk of endogenous release. Ecological dredging and establishment of constructed wetlands are possible measures to reduce the release of endogenous nitrogen.
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spelling pubmed-64661752019-04-22 Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China Yang, Xiaofan Wei, Xueyu Xu, Xiaoping Zhang, Yu Li, Jincheng Wan, Jie Int J Environ Res Public Health Article KCl-extractable sediment dissolved organic nitrogen (KS-DON) extracted from sediments near drinking water intakes of six drinking water sources in Taihu Lake in China was partitioned into hydrophobic and hydrophilic fractions and high/low molecular weight fractions. The results showed that the total dissolved nitrogen (TDN) contents of the extracts ranged from 67.78 to 128.27 mg/kg. KS-DON was the main TDN species, accounting for more than 50%, with NH(4)(+)-N and NO(3)(−)-N averaging 30% and 20%, respectively. The molecular weight fractions of <1 kDa accounted for almost half of KS-DON. Hydrophilic compounds accounted for more than 75% of KS-DON. Three fluorescence peaks were identified: soluble microbial byproducts (A); protein-like substances (B); and humic acid-like substances (C). It is concluded that the KS-DON in Taihu Lake sources has higher bioavailability and higher risk of endogenous release. Ecological dredging and establishment of constructed wetlands are possible measures to reduce the release of endogenous nitrogen. MDPI 2019-03-14 2019-03 /pmc/articles/PMC6466175/ /pubmed/30875848 http://dx.doi.org/10.3390/ijerph16060929 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yang, Xiaofan
Wei, Xueyu
Xu, Xiaoping
Zhang, Yu
Li, Jincheng
Wan, Jie
Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China
title Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China
title_full Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China
title_fullStr Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China
title_full_unstemmed Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China
title_short Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China
title_sort characteristics of dissolved organic nitrogen in the sediments of six water sources in taihu lake, china
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6466175/
https://www.ncbi.nlm.nih.gov/pubmed/30875848
http://dx.doi.org/10.3390/ijerph16060929
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