乌梁素海结冰过程中总磷的迁移过程研究

Total Phosphorus Migration in Wuliangsuhai Lake During Ice Growth Process

以内蒙古乌梁素海为研究对象,测量不同冰厚时冰体与其对应冰下水体的总磷(TP)含量,探究结冰过程中TP在冰-水界面及冰体内部的迁移过程。结果表明:水体中TP的均值含量是其对应冰体内的1.51倍,即乌梁素海结冰过程中具有排磷效应,根据固-液平衡理论对乌梁素海结冰过程中磷的迁移作出了合理解释:当温度低于低共熔点温度时就会发生共晶转变,此时湖水中将有H2O(s)和TP(s)同时析出。在冰体内部,因冰盖和昼夜温差的影响,使上层冰体的TP含量大于中下层冰体,且TP随着排磷通道在冰体内部迁移,由于冰盖厚度的改变使冰生长速率发生变化。

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 I.ake 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.