Characteristics of dissolved organic nitrogen (DON) in the surface water of Beijing Olympic Forest Park

被引：21

作者：

Huo, Shouliang ^{[1
]}

Yu, Honglei ^{[1
,2
]}

Xi, Beidou ^{[1
]}

Zan, Fengyu ^{[1
,2
]}

Zhu, Chaowei ^{[1
]}

Zhang, Jingtian ^{[1
]}

机构：

[1] Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China

[2] Anhui Normal Univ, Coll Environm Sci & Engn, Wuhu 241000, Anhui, Peoples R China

来源：

ENVIRONMENTAL EARTH SCIENCES | 2014年 / 71卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Dissolved organic nitrogen (DON); Nanofiltration; Molecular weight distribution; Surface water; STOICHIOMETRY; PRETREATMENT; EFFLUENTS; REMOVAL; RELEASE; STREAMS; SAMPLES; CARBON; US;

D O I：

10.1007/s12665-013-2785-1

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The characteristics of dissolved organic nitrogen (DON) in surface water from Beijing Olympic Forest Park (BOFP) were investigated in this study. Nanofiltration (NF) pretreatment procedure using two NF membranes (NF90 and NF270) was applied to increase the accuracy and precision of DON measurements in surface water samples with high dissolved inorganic nitrogen/total dissolved nitrogen (DIN/TDN) ratios. Compared to NF90, NF270 showed better performance in lowering the DIN/TDN ratio and retaining DOC in both the synthetic water and raw water samples. DON concentrations ranged from 0.01 to 0.83 mg N L-1 in water samples collected over four different months and showed a seasonal variation. The DON increased in summer due to the higher activity of decomposers on recent litterfall or because of a higher production of biomass in the surface water body. The molecular weight (MW) fractions of < 3 kDa accounted for more than 50 % of the total DOC concentration and the fractions of < 3 kDa contributed to more than 48 % of the total DON concentration. It could be concluded that most of the DON present in surface water of BOFP was composed of small molecules, which were mainly composed of monomers such as amino acids and urea, readily available for the uptake by phytoplankton and heterotrophic bacteria.

引用

页码：4021 / 4028

页数：8

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