NDLI: The distribution of nitrogen speciation and sources of nitrate in the north of Taihu Lake

Content Provider	Springer Nature Link
Author	Li, Da Jiang, Xia Wang, Kun Zheng, Binghui
Copyright Year	2016
Abstract	Meiliang Bay and Gonghu Bay, in the north of Taihu Lake, are important water sources for the city of Wuxi, and increased eutrophication now threatens the safety of drinking water. The distribution of nitrogen (N) speciation and source of N in the surface waters in the north of Taihu Lake is studied, which was an important first step in controlling N pollution. The result shows that the average concentration of ammonia (NH$_{4}$ $^{+}$) and nitrate (NO$_{3}$ $^{−}$) of surface water in Meiliang Bay was 0.32 and 0.35 mg/L, while 0.21 and 0.74 mg/L of Gonghu Bay, in which both bays had serious nitrate pollution. The concentrations of NH$_{4}$ $^{+}$ and NO$_{3}$ $^{−}$ in the surface water of the two bays had a trend of gradual decrease from north to south. The maximum concentrations of NH$_{4}$ $^{+}$ and NO$_{3}$ $^{−}$ of two bays were observed near the inflowing rivers, and the maximum concentrations of NH$_{4}$ $^{+}$ in surface water of two bays were 0.49 and 0.61, and 0.77 and 1.38 mg/L of NO$_{3}$ $^{−}$. The concentration of NH$_{4}$ $^{+}$ in the interstitial water of the two bays had a trend of gradual decrease from west to east, but NO$_{3}$ $^{−}$ had the opposite tendency. The maximum concentrations of NH$_{4}$ $^{+}$ in the interstitial water of the two bays were 5.88 and 4.64, and 3.58 and 7.18 mg/L of NO$_{3}$ $^{−}$. The exchangeable NH$_{4}$ $^{+}$ content in the sediment of Meiliang Bay had a trend of gradual decrease from north to south, but Gonghu Bay showed the reverse. The exchangeable NO$_{3}$ $^{−}$ content in the sediment of Meiliang Bay had a trend of gradual decrease from east to west, but a decreasing trend from north to south was observed in Gonghu Bay. The maximum concentrations of exchangeable NH$_{4}$ $^{+}$ were determined, and the values were 96.25 and 74.90 mg/kg, as well as NO$_{3}$ $^{−}$ with the values of 12.06 and 7.08 mg/kg. Chemical fertilizer and domestic sewage were the major sources of nitrate in surface water of Gonghu Bay, contributing 39.16 and 47.79%, respectively. Domestic sewage was the major source of nitrate in Meiliang Bay, contributing 84.79%. The denitrification process in Gonghu Bay was more apparent than in Meiliang Bay. Mixing and dilution processes had important effects on changing the concentration of nitrate transportation in the two bays.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	24
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-12-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Surface water Interstitial water Sediment Distribution Source of nitrate Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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