Chemical speciation of silver (Ag) in soils under aerobic and anaerobic conditions: Ag nanoparticles vs. ionic Ag
作者： Yohey Hashimoto , Satoshi Takeuchi , Satoshi Mitsunobu , Yong-Sik Ok
DOI: 10.1016/J.JHAZMAT.2015.09.001
关键词: Redox 、 Soil water 、 Silver nanoparticle 、 Nuclear chemistry 、 Chemical engineering 、 Clay minerals 、 Metal 、 Anaerobic exercise 、 Humus 、 Soil classification 、 Chemistry
摘要: This study investigated how silver nanoparticles (AgNP) and ionic (AgNO3) undergo phase-transformations in soils under aerobic anaerobic conditions using extended X-ray absorption fine structure (EXAFS) spectroscopy. After 30 days of incubation, 88% AgNP added to the soil remained persistent, whereas AgNO3 was completely transformed into Ag associated with humus clay minerals. In soil, 83% spiked Ag2S, accompanied by significant decrease water- acid-extractable fractions. About 50% underwent transformations metallic associations Oxide (Ag2O) carbonate (Ag2CO3) forms were not predominant soils. The redox potential had a profound effect on determination phase-transformation pathways for Ag.
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