Effects of fulvic acid on the water infiltration of soil contaminated by polyethylene microplastics
To study the effect of fulvic acid on the water infiltration of polyethylene-contaminated soil,0.3%fulvic acid was added to contaminated soil containing 0.1%,1%,and 3%fluorescent-stained polyethylene and analyzed by one-dimensional vertical infiltration test of the soil column.The key results of the study were listed below:compared with the blank soil,0.1%and 1%polyethylene reduced the pore structure and roughness of the soil surface(inhibiting soil water infiltration and reducing the soil saturated water conductivity),whereas 3%polyethylene increased the soil surface pore structure and roughness(reducing the infiltration rate and saturated water conductivity);after the application of 0.3%fulvic acid of on the soil surface of 0.1%,1%,and 3%polyethylene pollution,the pore structure increased,the roughness increased,the water infiltration rate decreased,and the saturated water conductivity increased with the increase of polyethylene content;however,the saturated water conductivity decreased by 48.75%,32.01%,and 3.64%,respectively;and the addition of 0.3%fulvic acid increased the vertical downward migration rate of polyethylene microplastics in the soil by 33.33%,37.50%,and 38.33%,in the 0.1%,1%,and 3%polyethylene samples,respectively.Thus,fulvic acid increases the pore structure and roughness of polyethylene-contaminated soil,which can reduce the water infiltration rate and saturated water conductivity and improve the vertical downward migration rate of polyethylene in the soil.
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