Sources and transformations of anthropogenic nitrogen in the highly disturbed Huai River Basin, Eastern China

Environmental Science and Pollution Research International
Pei MaXinqing Han

Abstract

Due to serious nitrogen pollution in the Huai River, Eastern China, nitrogenous concentrations and dual stable isotopes (δ15N and δ18O) were measured to ascertain the sources and transformation of nitrogen in the Shaying River, the largest and most polluted tributary of the Huai River during the summer and winter seasons. Total nitrogen (TN), NO3-, and NH4+ were significantly higher in winter, with values of 7.84 ± 3.44 mg L-1, 2.31 ± 0.81 mg L-1, and 3.00 ± 2.24 mg L-1, respectively, while the highest nitrogen compounds occurred in the Jialu River, one of the tributaries of the Shaying River, in both summer and winter. Isotope characteristics of nitrate reveal that manure and sewage were the principal nitrate sources in both summer (62.44 ± 19.66%) and winter (67.33 ± 15.45%), followed by soil organic nitrogen, with 24.94 ± 15.52% in summer and 26.33 ± 9.45% in winter. Values of δ15N-suspended particulate nitrogen (SPN) ranged from 0.78 to 13.51%, revealing that point source from industrial and domestic sewage accounted for the largest input to SPN at most sites, whereas soil organic nitrogen and agricultural fertilizers were found in the Jialu River in both sampling periods. Point sources from septic/manure and household wast...Continue Reading

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Citations

Jan 30, 2021·The Science of the Total Environment·Xin ZhangLijiang Ren
Apr 29, 2021·Environmental Science and Pollution Research International·Shengwei CaoYasong Li
Nov 5, 2021·Environmental Science and Pollution Research International·Zuhong LinTingting Zhang

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