Abstract：In order to explore the influence of microplastics reserve on the distribution and migration of typical environmental factors (total nitrogen, total phosphorus, salinity, chemical oxygen demand and suspended solids) during the icing process, the indoor simulations were adopted to study the distribution and migration of typical environmental factors in the ice-water phase under different conditions (icing ratio, freezing temperature and mode and initial concentration). The migration ability of environmental was characterized by material distribution coefficient(K). The results showed that the ice had a repulsive effect on environmental factors during the freezing process, and the occurrence of microplastics under different conditions had a certain degree of influence on the distribution of environmental factors. The environmental factors that should have migrated to the water under the ice were partially retained in the ice due to the characteristics of microplastics, resulting in an increase in the concentration of environmental factors in the ice, which was 1.13~1.49 times that of the control group. At the same time, the concentration of environmental factors in the subglacial water decreased, which was 0.73~0.93 times that of the control group. The presence of microplastics also increased the partition coefficient K of environmental factors by 0.04~0.18 and decreased the ability of environmental factors to migrate to subglacial waters. However, the occurrence of microplastics did not change the trend of environmental factors transferring from ice to subglacial water during the freezing process. The carrying effect of microplastics on environmental factors was less than the repulsion effect of ice on environmental factors. At the same time, the influence of microplastics on the distribution and migration mechanism of environmental factors during freezing under different conditions could be explained from the perspective of crystallography and cocrystal theory.
王志超, 窦雅娇, 康延秋, 周鑫, 杨文焕, 敬双怡, 李卫平. 微塑料对结冰过程中环境因子迁移的影响[J]. 中国环境科学, 2022, 42(11): 5369-5377.
WANG Zhi-chao, DOU Ya-jiao, KANG Yan-qiu, ZHOU Xin, YANG Wen-huan, JING Shuang-yi, LI Wei-ping. Effect of microplastics on the transport of environmental factors during icing and the mechanism of action. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5369-5377.
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