To observe the co-transport of Cd(Ⅱ) with nanoscale As₂S₃ (nAs₂S₃) in a soil-packed column under different ionic strength (IS). A soil-packed column experiment with Cd(Ⅱ) and nAs₂S₃ was conducted. The results show that the transport of Cd(Ⅱ) was facilitated remarkably in the presence of nAs₂S₃, and nano-associated-Cd(Ⅱ) was the major migration type. However, the co-transport of Cd(Ⅱ) and nAs₂S₃ was affected by IS. The Cd(Ⅱ) concentration in the effluent to initial Cd(Ⅱ) concentration decreased from 38.75% to 29.95% and 22.28% as IS increased from 1 mM to 10 mM and 50 mM. When IS was 1 mm, 10 mm and 50 mm, the retention of nAs₂S₃ increased from 74.29% to 78.95% and 85.9% respectively. The agglomeration and sedimentation of nAs₂S₃ were the main reason for the rise of retention. Due to the increase of retention and reduction in adsorption capacity of nAs₂S₃ to Cd(Ⅱ), the ratio of migration in the form of nano-associated-Cd(Ⅱ) reduced from 53% (IS 1 mM) to 27.4% (IS 10 mM) and 18.2% (IS 50 mM). During the transport, the IS promoted desorption of Cd(Ⅱ) from nAs₂S₃ so that more soluble Cd was monitored in the effluent as IS increased. In general, these findings can provide references for controlling the risk caused by the co-transport of nAs₂S₃ and Cd(Ⅱ) in saline-alkali soil.

观察不同离子强度(IS)下Cd(Ⅱ)与纳米级As ₂ S ₃ (nAs ₂ S ₃ )在土壤填充柱中的共输运情况。用Cd(Ⅱ)和nAs ₂ S ₃进行了填土柱实验。结果表明，nAs ₂ S ₃存在显着促进了Cd(Ⅱ)的迁移，其中纳米缔合Cd(Ⅱ)是主要的迁移类型。然而，Cd(Ⅱ)和nAs ₂ S ₃的共输运受到IS的影响。随着 IS 从 1 mM 增加到 10 mM 和 50 mM，流出物中的 Cd(II) 浓度从初始 Cd(II) 浓度的 38.75% 下降到 29.95% 和 22.28%。当 IS 为 1 mm、10 mm 和 50 mm 时，nAs ₂ S ₃的保留率分别从 74.29% 增加到 78.95% 和 85.9%。nAs ₂ S ₃的团聚和沉降是滞留率上升的主要原因。由于nAs ₂ S ₃对Cd(Ⅱ)的保留增加和吸附容量降低，纳米结合Cd(Ⅱ)形式的迁移率从53% (IS 1 mM)降低到27.4% (IS 10 mM) 和 18.2% (IS 50 mM)。在运输过程中，IS促进了nAs ₂中Cd(Ⅱ)的解吸S ₃以便随着 IS 增加在流出物中监测到更多可溶的 Cd。总的来说，这些发现可以为控制盐碱土中nAs ₂ S ₃和Cd(Ⅱ)共同转运引起的风险提供参考。