A predictive model of the effects of aging on cobalt fate and behavior in soil

Laura A. Wendling, Ma Yibing, Jason K. Kirby, Michael J. Mclaughlin

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

Abstract

Metal toxicity to terrestrial organisms is influenced by a number of factors including the organisms affected and ecotoxicological end points, soil properties, aging processes, and metal speciation. The toxicity of metals added to soils can change over time through aging processes, which may reduce availability of metals via diffusion into micropores, incorporation into crystal lattices, or Ostwald ripening of precipitates. Metals which have been in contact with soil for longer periods are less able to exchange with the soil solution, rendering them less available to soil biota. The objective of this work was to investigate and model the effects of long- term aging on cobalt(ll) (Co2+) (isotopic) exchangeability and potential bioavailability in a wide range of soils, as this is the form of Co commonly used in ecotoxicological investigations. After addition to soil, added soluble Co(ll) rapidly partitioned to the soil solid phase, and in alkaline soils a large percentage of this surface-bound Co was fixed through aging reactions in forms that were no longer in equilibrium with the soil solution Co. Analyses indicated that soil pH and incubation time were the most important factors affecting Co(II) aging. The rate and extent of aging of added Co(ll) could be accurately predicted across all soils using a semi-mechanistic model that suggested Co was fixed through reactions that we postulate were related to surface oxidation/precipitation/ nucleation as driven by hydrolysis reactions at the surface of soil minerals.

Original languageEnglish
Pages (from-to)135-141
JournalEnvironmental Science & Technology
Volume43
Issue number1
DOIs
Publication statusPublished - 1 Jan 2009
MoE publication typeA1 Journal article-refereed

Fingerprint

Cobalt
cobalt
Aging of materials
Soils
soil
Metals
metal
effect
Toxicity
toxicity
soil biota
ripening
Ostwald ripening
nucleation
bioavailability
hydrolysis
soil property
Crystal lattices
Minerals
incubation

Cite this

Wendling, Laura A. ; Yibing, Ma ; Kirby, Jason K. ; Mclaughlin, Michael J. / A predictive model of the effects of aging on cobalt fate and behavior in soil. In: Environmental Science & Technology. 2009 ; Vol. 43, No. 1. pp. 135-141.
@article{c3f245c72009493cbad68e6daca46986,
title = "A predictive model of the effects of aging on cobalt fate and behavior in soil",
abstract = "Metal toxicity to terrestrial organisms is influenced by a number of factors including the organisms affected and ecotoxicological end points, soil properties, aging processes, and metal speciation. The toxicity of metals added to soils can change over time through aging processes, which may reduce availability of metals via diffusion into micropores, incorporation into crystal lattices, or Ostwald ripening of precipitates. Metals which have been in contact with soil for longer periods are less able to exchange with the soil solution, rendering them less available to soil biota. The objective of this work was to investigate and model the effects of long- term aging on cobalt(ll) (Co2+) (isotopic) exchangeability and potential bioavailability in a wide range of soils, as this is the form of Co commonly used in ecotoxicological investigations. After addition to soil, added soluble Co(ll) rapidly partitioned to the soil solid phase, and in alkaline soils a large percentage of this surface-bound Co was fixed through aging reactions in forms that were no longer in equilibrium with the soil solution Co. Analyses indicated that soil pH and incubation time were the most important factors affecting Co(II) aging. The rate and extent of aging of added Co(ll) could be accurately predicted across all soils using a semi-mechanistic model that suggested Co was fixed through reactions that we postulate were related to surface oxidation/precipitation/ nucleation as driven by hydrolysis reactions at the surface of soil minerals.",
author = "Wendling, {Laura A.} and Ma Yibing and Kirby, {Jason K.} and Mclaughlin, {Michael J.}",
year = "2009",
month = "1",
day = "1",
doi = "10.1021/es801322r",
language = "English",
volume = "43",
pages = "135--141",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society ACS",
number = "1",

}

A predictive model of the effects of aging on cobalt fate and behavior in soil. / Wendling, Laura A.; Yibing, Ma; Kirby, Jason K.; Mclaughlin, Michael J.

In: Environmental Science & Technology, Vol. 43, No. 1, 01.01.2009, p. 135-141.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A predictive model of the effects of aging on cobalt fate and behavior in soil

AU - Wendling, Laura A.

AU - Yibing, Ma

AU - Kirby, Jason K.

AU - Mclaughlin, Michael J.

PY - 2009/1/1

Y1 - 2009/1/1

N2 - Metal toxicity to terrestrial organisms is influenced by a number of factors including the organisms affected and ecotoxicological end points, soil properties, aging processes, and metal speciation. The toxicity of metals added to soils can change over time through aging processes, which may reduce availability of metals via diffusion into micropores, incorporation into crystal lattices, or Ostwald ripening of precipitates. Metals which have been in contact with soil for longer periods are less able to exchange with the soil solution, rendering them less available to soil biota. The objective of this work was to investigate and model the effects of long- term aging on cobalt(ll) (Co2+) (isotopic) exchangeability and potential bioavailability in a wide range of soils, as this is the form of Co commonly used in ecotoxicological investigations. After addition to soil, added soluble Co(ll) rapidly partitioned to the soil solid phase, and in alkaline soils a large percentage of this surface-bound Co was fixed through aging reactions in forms that were no longer in equilibrium with the soil solution Co. Analyses indicated that soil pH and incubation time were the most important factors affecting Co(II) aging. The rate and extent of aging of added Co(ll) could be accurately predicted across all soils using a semi-mechanistic model that suggested Co was fixed through reactions that we postulate were related to surface oxidation/precipitation/ nucleation as driven by hydrolysis reactions at the surface of soil minerals.

AB - Metal toxicity to terrestrial organisms is influenced by a number of factors including the organisms affected and ecotoxicological end points, soil properties, aging processes, and metal speciation. The toxicity of metals added to soils can change over time through aging processes, which may reduce availability of metals via diffusion into micropores, incorporation into crystal lattices, or Ostwald ripening of precipitates. Metals which have been in contact with soil for longer periods are less able to exchange with the soil solution, rendering them less available to soil biota. The objective of this work was to investigate and model the effects of long- term aging on cobalt(ll) (Co2+) (isotopic) exchangeability and potential bioavailability in a wide range of soils, as this is the form of Co commonly used in ecotoxicological investigations. After addition to soil, added soluble Co(ll) rapidly partitioned to the soil solid phase, and in alkaline soils a large percentage of this surface-bound Co was fixed through aging reactions in forms that were no longer in equilibrium with the soil solution Co. Analyses indicated that soil pH and incubation time were the most important factors affecting Co(II) aging. The rate and extent of aging of added Co(ll) could be accurately predicted across all soils using a semi-mechanistic model that suggested Co was fixed through reactions that we postulate were related to surface oxidation/precipitation/ nucleation as driven by hydrolysis reactions at the surface of soil minerals.

UR - http://www.scopus.com/inward/record.url?scp=61849175325&partnerID=8YFLogxK

U2 - 10.1021/es801322r

DO - 10.1021/es801322r

M3 - Article

C2 - 19209596

AN - SCOPUS:61849175325

VL - 43

SP - 135

EP - 141

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

IS - 1

ER -