作者：Li, M (Li, Min); Greenfield, B (Greenfield, Ben K.) ; Nunes, LM (Nunes, Luis M.); Dang, F (Dang, Fei) ; Liu, HL (Liu, Hai-long); Zhou, DM (Zhou, Dong-mei); Yin, B (Yin, Bin) 

题目：High retention of silver sulfide nanoparticles in natural soils

出版物：JOURNAL OF HAZARDOUS MATERIALS，卷: 378   文献号: UNSP 120735

DOI: 10.1016/j.jhazmat.2019.06.012

出版年: OCT 15 2019

摘要：

Silver, either in ionic or nanoparticulate form, is widely used in consumer products. However, silver sulfide (Ag2S) are more likely to be the form that Ag enters the environment. The retention of silver sulfide nanoparticles (Ag2S-NPs) in natural soils is critical for bioavailability and toxicity but remains unclear. Here, we examined the retention of Ag2S-NPs in 11 natural soils with varying properties using batch assays. More than 99% of Ag2S-NPs were retained in soil solids, irrespective of soil properties. Such high retention of Ag2S-NPs, at least partially, explained the distinct differences in phytoavailability performed in soil vs. liquid media in the literature. Nanoparticles containing Ag and S were identified in representative soil solids by high resolution transmission electron microscopy equipped with an energy dispersive X-ray spectrometer. Iron-rich acidic soil had a high dissolution of Ag2S-NPs ranging from 47.1% to 61.7% in porewater. In contrast to Ag2S-NPs, silver nanoparticles (AgNPs) and Ag+ in these soils were less retained (as described by Freundlich model) and the retention was closely associated with soil properties. These findings highlight the unique behaviors of Ag2S-NPs in natural soils.