Effects of background ion types and concentrations on the co-transport of polystyrene microplastics / lead in saturated quartz sand
CHANG Bo-kun1, CHEN Yi-ting1, CAO Gang1, HU Liang1, Lü Jia-long1, DU Wei1, HU Fei-nan1,2
1. College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; 2. Institute of Soil and Water Conservation, CAS & Ministry of Water Resources, Yangling, Shaanxi 712100, China
Abstract：In order to elucidate the effect of hydrochemical conditions on the transport of microplastics and heavy metals, and to clarify the coupling effect in the co-transport process of the two environmental pollutants and their response mechanism to environmental conditions preliminarily, the effects of background electrolyte ions with different valence and concentrations on the individual and co-transport behaviors of 1μm polystyrene microplastics (PS-MPs) and Pb2+ in a saturated one-dimensional sand column were studied. The experimental results showed that the increase in the background ion concentration or the valence would inhibit the individual transport ability of PS-MPs. When the Na+ concentration increased from 1mmol/L to 100mmol/L, the repulsive barrier between PS-MPs and quartz sand decreased by 1348kT; when the Ca2+ concentration increased from 1mmol/L to 100mmol/L, the repulsive barrier between PS-MPs and quartz sand decreased by 956kT. Pb2+ in PS-MPs/Pb2+ binary system could reduce the transport ability of PS-MPs, and the increase of the background ion concentration and the valence can weaken the inhibition of Pb2+ on the transport ability of PS-MPs. When the Na+ concentration increased from 1mmol/L to 100mmol/L, the repulsive barrier between PS-MPs and quartz sand decreased by 1100kT; when the Ca2+ concentration increased from 1mmol/L to 100mmol/L, the repulsive barrier between PS-MPs and quartz sand decreased by 543kT. The increase in the background ion concentration or the valence can promote the individual transport ability of Pb2+. PS-MPs can promote the transport of Pb2+ in the binary system of PS-MPs/Pb2+. When the background ion concentration was low, the transport of Pb2+loaded by PS-MPs was higher, and vice versa. For PS-MPs and Pb2+ individual transport systems, the increase in background cation concentration and valence can further shield the negative charges on the surface of PS-MPs and quartz sand, competitive adsorption the surface binding sites of quartz sand, inhibits the transport of PS-MPs while promoting Pb2+ transport. For the co-transport system of PS-MPs and Pb2+, the increase in background ion concentration and valence can weaken the inhibitory effect of Pb2+ on the transport ability of PS-MPs by adjusting the interaction between Pb2+ and PS-MPs and the surface of quartz sand. The competitive adsorption of background ions to PS-MPs’ surface sites and the shielding effect on charges affect the transport ability of Pb2+ loaded by PS-MPs.
常博焜, 陈怡汀, 曹钢, 胡良, 吕家珑, 杜伟, 胡斐南. 背景离子类型和浓度对聚苯乙烯微塑料/铅在饱和石英砂中共运移的影响[J]. 中国环境科学, 2022, 42(7): 3193-3203.
CHANG Bo-kun, CHEN Yi-ting, CAO Gang, HU Liang, Lü Jia-long, DU Wei, HU Fei-nan. Effects of background ion types and concentrations on the co-transport of polystyrene microplastics / lead in saturated quartz sand. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3193-3203.
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