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Article

Determination of Water Quality Characteristics and Nutrient Exchange Flux at the Sediment—Water Interface of the Yitong River in Changchun City, China

by 1, 1, 1 and 2,*
1
Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China
2
College of Civil Engineering and Architecture, Changchun Sci-Tech University, Changchun 130022, China
*
Author to whom correspondence should be addressed.
Academic Editors: Nicoletta Ademollo, Jasmin Rauseo, Luisa Patrolecco and Francesca Spataro
Water 2021, 13(24), 3555; https://doi.org/10.3390/w13243555
Received: 12 November 2021 / Revised: 3 December 2021 / Accepted: 7 December 2021 / Published: 12 December 2021
In this paper, the characteristics of water pollution in Yitong River were analyzed by the comprehensive pollution index method. Combined with the pore water concentration gradient method and Fick’s first law, the release characteristics of nutrients at the sediment–water interface of Yitong River (Jilin Province, China) were studied. The results showed that the distribution trend of nitrogen and phosphorus content in the overlying and interstitial water of the Yitong River was the same, and the highest values appeared at the S3 and S5 points in the urban section. The water quality was mainly affected by nitrogen pollutants in domestic sewage. The evaluation results of the water quality comprehensive pollution index showed that the pollution degree of interstitial water in urban areas was much higher than that of the overlying water, and the endogenous nitrogen and phosphorus pollutants had the risk of diffusion to the overlying water. The exchange flux analysis of ammonia nitrogen (NH4+-N), total dissolved nitrogen (TDN), and total dissolved phosphorus (TDP) in water showed that the diffusion flux of NH4+-N ranged from 0.03 to 6.52 mg·(m2·d)−1, and the sediment was the “source” of ammonia nitrogen pollutants. The range of TDN diffusion flux was −1.57 to 11.6 mg·(m2·d) −1, and the difference between points was large. The sediment was both the “source” and “sink” of nitrogen pollutants. The range of TDP diffusion flux was −0.05 to 0.22 mg·(m2·d) −1. Except for point S8, the TDP diffused from sediment into the water body. Among all the sampling points, the diffusion fluxes of NH4+-N, TDN, and TDP at the S3 point were the largest, the release rate of endogenous pollutants was the most rapid, and the pollution to the water quality was the most serious. The results are of great significance to the exchange flux of nutrients at the sediment–water interface of rivers and the prevention and control of water eutrophication. It also provides a reference for the study of nutrient exchange flux at the sediment–water interface of rivers and other surface water bodies worldwide. View Full-Text
Keywords: Yitong River; overlying water; interstitial water; water quality characteristics; nitrogen and phosphorus nutrients; diffusion flux Yitong River; overlying water; interstitial water; water quality characteristics; nitrogen and phosphorus nutrients; diffusion flux
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MDPI and ACS Style

Zhao, K.; Fu, H.; Wang, Q.; Lu, H. Determination of Water Quality Characteristics and Nutrient Exchange Flux at the Sediment—Water Interface of the Yitong River in Changchun City, China. Water 2021, 13, 3555. https://doi.org/10.3390/w13243555

AMA Style

Zhao K, Fu H, Wang Q, Lu H. Determination of Water Quality Characteristics and Nutrient Exchange Flux at the Sediment—Water Interface of the Yitong River in Changchun City, China. Water. 2021; 13(24):3555. https://doi.org/10.3390/w13243555

Chicago/Turabian Style

Zhao, Ke, Hang Fu, Qian Wang, and Hai Lu. 2021. "Determination of Water Quality Characteristics and Nutrient Exchange Flux at the Sediment—Water Interface of the Yitong River in Changchun City, China" Water 13, no. 24: 3555. https://doi.org/10.3390/w13243555

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