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

34 Citations (Scopus)

Abstract

This study investigated how silver nanoparticles (AgNP) and ionic silver (AgNO ₃ ) 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 AgNO ₃ was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag ₂ S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO ₃ spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag ₂ O) and carbonate (Ag ₂ CO ₃ ) 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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10.1016/j.jhazmat.2015.09.001

Cite this

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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 (AgNO 3 ) 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 AgNO 3 was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag 2 S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO 3 spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag 2 O) and carbonate (Ag 2 CO 3 ) 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. ",

keywords = "Chemical speciation, Nanomaterials, Redox, XAFS",

author = "Yohey Hashimoto and Satoshi Takeuchi and Satoshi Mitsunobu and Ok, {Yong Sik}",

note = "Funding Information: The authors are grateful to Noriko Yamaguchi (National Institute for Agro-Environmental Sciences) for supporting the XAFS experiment. The XAFS spectroscopy experiment was conducted using a Beamline BL01B1 at SPring-8, Hyogo, Japan, supported by the Japan Synchrotron Radiation Research Institute (proposal numbers: 2012B1327, 2013B1068, and 2014B1245). This study was funded in part by Challenging Exploratory Research, MEXT KAKENHI Grant Number 24658062 for Y.H., provided by The Ministry of Education, Culture, Sports, Science, and Technology, Japan. The following data are included in Supporting Information: time-series Eh data in the soil during the incubation period, SPOIL scores for LCF-EXAFS investigation, chemical equilibrium reactions and stability constants of Ag compounds used for constructing an Eh-pH diagram, Fourier transformed EXAFS shell fitting, and the best and second-best results of LCF on Ag K-edge EXAFS spectra. Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2017",

month = jan,

day = "15",

doi = "10.1016/j.jhazmat.2015.09.001",

language = "English",

volume = "322",

pages = "318--324",

journal = "Journal of Hazardous Materials",

issn = "0304-3894",

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TY - JOUR

T1 - Chemical speciation of silver (Ag) in soils under aerobic and anaerobic conditions

T2 - Ag nanoparticles vs. ionic Ag

AU - Hashimoto, Yohey

AU - Takeuchi, Satoshi

AU - Mitsunobu, Satoshi

AU - Ok, Yong Sik

N1 - Funding Information: The authors are grateful to Noriko Yamaguchi (National Institute for Agro-Environmental Sciences) for supporting the XAFS experiment. The XAFS spectroscopy experiment was conducted using a Beamline BL01B1 at SPring-8, Hyogo, Japan, supported by the Japan Synchrotron Radiation Research Institute (proposal numbers: 2012B1327, 2013B1068, and 2014B1245). This study was funded in part by Challenging Exploratory Research, MEXT KAKENHI Grant Number 24658062 for Y.H., provided by The Ministry of Education, Culture, Sports, Science, and Technology, Japan. The following data are included in Supporting Information: time-series Eh data in the soil during the incubation period, SPOIL scores for LCF-EXAFS investigation, chemical equilibrium reactions and stability constants of Ag compounds used for constructing an Eh-pH diagram, Fourier transformed EXAFS shell fitting, and the best and second-best results of LCF on Ag K-edge EXAFS spectra. Publisher Copyright: © 2015 Elsevier B.V.

PY - 2017/1/15

Y1 - 2017/1/15

N2 - This study investigated how silver nanoparticles (AgNP) and ionic silver (AgNO 3 ) 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 AgNO 3 was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag 2 S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO 3 spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag 2 O) and carbonate (Ag 2 CO 3 ) 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 (AgNO 3 ) 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 AgNO 3 was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag 2 S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO 3 spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag 2 O) and carbonate (Ag 2 CO 3 ) 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.

KW - Chemical speciation

KW - Nanomaterials

KW - Redox

KW - XAFS

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C2 - 26412016

AN - SCOPUS:84949984286

VL - 322

SP - 318

EP - 324

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

SN - 0304-3894

ER -

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

Abstract

Keywords

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