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Organic Phosphorus Decomposition Rates in the Youngsan River and the Sumjin River, Korea  

Islam, Jahidul Mohammad (Department of Environmental Science, Kangwon National University)
Kim, Bomchul (Department of Environmental Science, Kangwon National University)
Han, Ji-sun (Department of Environmental Science, Kangwon National University)
Kim, Jai-ku (Department of Environmental Science, Kangwon National University)
Jung, Yukyong (Department of Environmental Science, Kangwon National University)
Jung, Sungmin (Department of Environmental Science, Kangwon National University)
Shin, Myoungsun (Department of Environmental Science, Kangwon National University)
Park, Ju-hyun (National Institute of Environmental Research)
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Abstract
The variability in the phosphorus concentrations and the decomposition rates of organic phosphorus were measured in two rivers, the Youngsan River and the Sumjin River through four surveys in June, August and December of 2006 and February of 2007. Water samples were incubated for 20 days in a dark incubator and the change of forms of phosphorus (POP, DOP, DIP) were analyzed. By fitting the change to four types of models the decomposition rates of organic phosphorus were determined. The mean total organic phosphorus (TOP) decomposition rate coefficients in the Youngsan River and the Sumjin River were $0.036day^{-1}$ and $0.035day^{-1}$, respectively. In POP$\rightarrow$DIP model, the average decomposition rate coefficients in the Youngsan River and the Sumjin River were 0.049 and $0.035day^{-1}$, respectively. The average POP decomposition rate coefficients of POP$\rightarrow$DOP$\rightarrow$DIP model were $0.042day^{-1}$ and $0.038day^{-1}$ in the Youngsan River and Sumjin River respectively while the mean DOP decomposition rate coefficients were $0.255day^{-1}$ and $0.244day^{-1}$, respectively. In the Youngsan River, the mean POP$\rightarrow$DOP decomposition rate coefficient and POP$\rightarrow$DIP decomposition rate coefficient of POP$\rightarrow$DOP$\rightarrow$DIP, POP$\rightarrow$DIP model were $0.039day^{-1}$ and $0.007day^{-1}$, respectively. And in the Sumjin River, the above decomposition rate coefficients were $0.031day^{-1}$ and $0.004day^{-1}$, respectively. The decomposition rate coefficients measured in this study might be applicable for modeling of river water quality.
Keywords
Decomposition rate coefficients; Organic phosphorus; Sumjin River; Youngsan River;
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