School of Environmental and Energy Engineering, Anhui Jianzhu University, Zhiyun Rd 292, Economic Development District, He'fei, 230601, People's Republic of China.
Environ Sci Pollut Res Int. 2018 May;25(13):12342-12351. doi: 10.1007/s11356-018-1777-9. Epub 2018 Apr 3.
The variation trend and growth rate of P were analyzed by the concentration of the phosphorus fraction on surface sediment of Dongting Lake from 2012 to 2016, to reveal the cumulative effect of P in the actual environment. Meanwhile, the adsorption kinetics and adsorption isotherm were employed to examine the P-release possibility of sediment, which predicts the yearly released sediment phosphorus in Dongting Lake. The actual growth rate of TP (Total Phosphorus) is 53 mg·(kg·year) in East Dongting Lake, 39 mg·(kg·year) in South Dongting Lake, and 29 mg·(kg·year) in West Dongting Lake, while the sum of the phosphorus fraction growth rates has little difference from the rate of TP in sediments of the three areas of Dongting Lake. Furthermore, the Elovich model and the Langmuir crossover-type equations are established to present the adsorption characteristic of sediment in Dongting Lake; the result shows that the sediments play a source role for phosphorus in East and South Dongting Lake from zero equilibrium phosphorus concentration (EPC) in the present situation, but an adsorption effect on TP is shown in West Dongting Lake. When the conditions of environment change are ignored, the maximum P-sorption level in sediments of East Dongting Lake will reach in 2040 according to the actual growth rate of sediments, while that in West Dongting Lake and South Dongting Lake will be in 2046 and 2061, respectively.
对 2012 年至 2016 年洞庭湖表层沉积物中磷各形态的浓度进行分析，揭示了磷在实际环境中的累积效应。同时，采用吸附动力学和吸附等温线来检验沉积物中磷的释放可能性，从而预测洞庭湖每年释放的沉积物磷。东洞庭湖实际总磷（TP）增长率为 53mg·（kg·年），南洞庭湖为 39mg·（kg·年），西洞庭湖为 29mg·（kg·年），而磷各形态增长率之和与洞庭湖三个区域沉积物中 TP 的增长率相差不大。此外，建立了 Elovich 模型和 Langmuir 交叉型方程来表示洞庭湖沉积物的吸附特征；结果表明，在当前零平衡磷浓度（EPC）的情况下，东洞庭湖和南洞庭湖的沉积物对磷起着源的作用，但西洞庭湖对 TP 则表现出吸附作用。在忽略环境变化条件下，根据沉积物的实际增长率，东洞庭湖沉积物的最大磷吸附水平将在 2040 年达到，而西洞庭湖和南洞庭湖将分别在 2046 年和 2061 年达到。
