Chemical speciation of silver (Ag) in soils under aerobic and anaerobic conditions: Ag nanoparticles vs. ionic Ag

Yohey Hashimoto; Satoshi Takeuchi; Satoshi Mitsunobu; Yong Sik Ok

doi:10.1016/j.jhazmat.2015.09.001

Chemical speciation of silver (Ag) in soils under aerobic and anaerobic conditions: Ag nanoparticles vs. ionic Ag

Yohey Hashimoto, Satoshi Takeuchi, Satoshi Mitsunobu, Yong Sik Ok

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

This study investigated how silver nanoparticles (AgNP) and ionic silver (AgNO₃) undergo phase-transformations in soils under aerobic and anaerobic conditions using extended X-ray absorption fine structure (EXAFS) spectroscopy. After 30 days of aerobic incubation, 88% of AgNP added to the soil remained persistent, whereas AgNO₃ was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag₂S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO₃ spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag₂O) and carbonate (Ag₂CO₃) forms of Ag were not predominant in aerobic and anaerobic soils. The redox potential of soil had a profound effect on determination of the phase-transformation pathways for AgNP and ionic Ag.

Original language	English
Pages (from-to)	318-324
Number of pages	7
Journal	Journal of Hazardous Materials
Volume	322
DOIs	https://doi.org/10.1016/j.jhazmat.2015.09.001
Publication status	Published - 2017 Jan 15
Externally published	Yes

Keywords

Chemical speciation
Nanomaterials
Redox
XAFS

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution
Health, Toxicology and Mutagenesis

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title = "Chemical speciation of silver (Ag) in soils under aerobic and anaerobic conditions: Ag nanoparticles vs. ionic Ag",

abstract = "This study investigated how silver nanoparticles (AgNP) and ionic silver (AgNO3) undergo phase-transformations in soils under aerobic and anaerobic conditions using extended X-ray absorption fine structure (EXAFS) spectroscopy. After 30 days of aerobic incubation, 88% of AgNP added to the soil remained persistent, whereas AgNO3 was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag2S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO3 spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag2O) and carbonate (Ag2CO3) forms of Ag were not predominant in aerobic and anaerobic soils. The redox potential of soil had a profound effect on determination of the phase-transformation pathways for AgNP and ionic Ag.",

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T2 - Ag nanoparticles vs. ionic Ag

AU - Hashimoto, Yohey

AU - Takeuchi, Satoshi

AU - Mitsunobu, Satoshi

AU - Ok, Yong Sik

PY - 2017/1/15

Y1 - 2017/1/15

N2 - This study investigated how silver nanoparticles (AgNP) and ionic silver (AgNO3) undergo phase-transformations in soils under aerobic and anaerobic conditions using extended X-ray absorption fine structure (EXAFS) spectroscopy. After 30 days of aerobic incubation, 88% of AgNP added to the soil remained persistent, whereas AgNO3 was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag2S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO3 spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag2O) and carbonate (Ag2CO3) forms of Ag were not predominant in aerobic and anaerobic soils. The redox potential of soil had a profound effect on determination of the phase-transformation pathways for AgNP and ionic Ag.

AB - This study investigated how silver nanoparticles (AgNP) and ionic silver (AgNO3) undergo phase-transformations in soils under aerobic and anaerobic conditions using extended X-ray absorption fine structure (EXAFS) spectroscopy. After 30 days of aerobic incubation, 88% of AgNP added to the soil remained persistent, whereas AgNO3 was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag2S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO3 spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag2O) and carbonate (Ag2CO3) forms of Ag were not predominant in aerobic and anaerobic soils. The redox potential of soil had a profound effect on determination of the phase-transformation pathways for AgNP and ionic Ag.

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KW - Redox

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