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摘要
In order to explore the migration law of toluene in heterogeneous capillary zone and the response of environmental factors, a one-dimensional soil column leaching experiment with multi-layered monitoring was used. This study simulated the migration process of toluene from the vadose zone to the aquifer under the instantaneous release situation, and the changes of pH, DO, ORP and other environmental factors with the migration of toluene were monitored synchronously. Through Pearson correlation analysis, the relationship between environmental factors and toluene migration was noticeable. The results showed that the migration of toluene in the capillary zone can be divided into four stages, namely, the rapid increase of concentration dominated by gravity; the migration rate decreased and the concentration increased slowly under the action of capillary zone jacking; the concentration of toluene decreased significantly under adsorption and the formation stage of stable pollution distribution. The environmental factors such as pH, DO and ORP were positively correlated with the migration process of toluene and showed obvious stages. Among them, the migration law of ORP was the closest to that of toluene, followed by pH, and the deviation between DO and migration law of toluene was the most obvious, especially in the ascending stage.
