离子强度和富里酸对纳米TiO_2在土壤中迁移的影响

Effect of Ionic Strength and Fulvic Acid on the Transport of TiO_2 Nanoparticles in Soil

采用自然土壤作为介质,研究了离子强度、富里酸对纳米TiO2在土壤中迁移性能的影响。结果表明,随着离子强度从0 m M增加至0.5 m M和5 m M,纳米TiO2在土壤中的相对流出浓度(C/C0)从0.85分别降低为0.45和0。然而,体系中含有富里酸时,纳米TiO2在土壤中的迁移能力变强了,5 mg/L和10 mg/L的富里酸分别使n TiO2的相对流出浓度提高到0.89和0.95,大大增加其环境风险。

The impact of ionic strength （ IS） and fulvic acid （ FA） on the transport of TiO2 nanoparticles （ nTiO2 ） in soil was investigated.Results showed that the relative concentration（ C/C0 ） of nTiO2 decreased from 0.85 to 0.45 and 0 when the IS concentration increased from 0 mM to 0.5 mM and 5 mM.However, the mobility of nTiO2 enhanced in the presence of FA in the system. The relative concentration （ C/C0 ） of nTiO2 increased to 0.89 and 0.95 when the concentration of FA increased to 5 mg/L and 10 mg/L, which greatly increased the environmental risk.