AI Article Synopsis
- Five sediment samples were taken from the Shiwuli River every two months to analyze phosphorus levels and assess the impact of added carbon on phosphorus release into the water.
- Results indicated high phosphorus pollution, with total phosphorus content averaging over 900 mg/kg and showing a gradual decline moving from urban to rural areas, while bio-available phosphorus remained constant.
- Adding exogenous carbon significantly reduced the equilibrium phosphate concentration (EPC) by about 29%, decreased the risk of phosphorus release from sediments, and altered the distribution of EPC values among different sampling sites.
Article Abstract
Five surface sediment samples were collected every two months from the Shiwuli River along an urban-rural gradient, Chaohu Lake Basin, from July 2017 to May 2018. Sediment phosphorus fractions were investigated, and equilibrium phosphate concentration (EPC) and its response to exogenous carbon (sodium acetate) addition were explored. Moreover, the risk of phosphorus release from sediment into water column was also evaluated. Results show that the Shiwuli River was seriously polluted by phosphorus. The average values of total phosphorus content in sediments ranged from 915.04 to 1205.31 mg·kg, and it decreased slowly along the urban-rural gradient, while the bio-available phosphorus content remained stable. Exogenous carbon addition not only reduced the EPC values of sediments (about 29%), but changed the order of EPC values among the five sampling sites as well. In general, the ratio of overlying water SRP (soluble reactive phosphorus) concentration to EPC value was 66.7%, and phosphorus adsorption-desorption equilibrium saturation EPC<-20% accounted for about 60.0%, indicating that the surface sediments in the Shiwuli River were dominated by phosphorus adsorption, namely, keeping the phosphorus "sink" state. The inputs of exogenous carbon addition increased the proportion of EPC<-20% from 60.0% to 73.3%, which lowered the risk of phosphorus release from sediments.
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| http://dx.doi.org/10.13227/j.hjkx.201811050 | DOI Listing |
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