Total Phosphorus Migration in Wuliangsuhai Lake During Ice Growth Process

GAO Ning; QIAO Lingmin; ZHANG Yan; LI Changyou; SHI Xiaohong; ZHANG Hong

Abstract：This study took the Wuliangsuhai Lake,which is located in Inner Mongolia,as research object.The content of total phosphorus (TP) for ice body and water body under ice was measured in different ice thickness,and the migration processes of TP in ice-water interface and in ice body were explored during freezing.The results showed that the average content of TP in water was 1.51 times of that in the corresponding ice body,which indicated that the Wuliangsuhai Lake had the effect of phosphorus releasing during icing.Utilizing solid-liquid equilibrium theory we explained the phenomenon of phosphorus migration in the icing of the Wuliangsuhai Lake.When temperature dropped below melting point,eutectic reaction would occur.Solid H2O and solid phosphorus were dissolved at same time.Inside ice body,because of the influence of ice and the temperature difference between day and night,the content of TP in upper-level ice was greater than that in the middle and bottom of ice layer,and TP was migrated in the ice within phosphorus channel.The ice growth rate changed because the ice thickness changed,which also leaded to the changes in TP migration flux in ice body and ice-water interface.