Understanding PM-bound trace element solubilities: Controls, anthropogenic and natural sources

Heavy metal pollution in fine particulate matter (PM2.5) is a subject of great concern due to rapid urbanization and industrialization. To evaluate the chemical characteristics and sources of PM2.5-bound trace elements (TEs) in PM2.5, chemical fractions of two-year (2019–2020) key TEs (Al, Si, Ca, F...

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Published inEnvironmental pollution (1987) Vol. 383; p. 126823
Main Authors Haswani, Diksha, Sunder Raman, Ramya
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 15.10.2025
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ISSN0269-7491
1873-6424
1873-6424
DOI10.1016/j.envpol.2025.126823

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Abstract Heavy metal pollution in fine particulate matter (PM2.5) is a subject of great concern due to rapid urbanization and industrialization. To evaluate the chemical characteristics and sources of PM2.5-bound trace elements (TEs) in PM2.5, chemical fractions of two-year (2019–2020) key TEs (Al, Si, Ca, Fe, Ti, K, S, P, Mn, Ni, V, Cr, Cu, Zn and Pb) were investigated. A four-step sequential extraction method was adopted to extract and analyse TEs exchangeable, reducible, oxidisable and residual fractions using inductively coupled plasma optical emission spectrometry. Positive Matrix Factorization was applied to the fractional concentrations of individual elements to apportion TE sources in PM2.5. The model resolved factors were identified as i) mineral dust ii) agricultural crop burning residues iii) vehicular emission iv) coal combustion residues, and v) industrial emission. Mobility of elements from geogenic sources increased during 2020 (COVID 19 lockdowns year), likely due to the formation of soluble secondary inorganic species, while mobility of elements from anthropogenic sources decreased. These findings suggest that anthropogenic activities influence not only TE abundance but also their solubility and bioavailability. [Display omitted] •Trace element (TE) solubility fractions apportioned to five factors using USEPA PMF5.•Solubility of geogenic TEs attributed to secondary inorganic species formation.•Anthropogenic activities drive TE abundance, solubility, and bioavailability.•Soluble TE better reflects health risks than total TE concentrations.
AbstractList Heavy metal pollution in fine particulate matter (PM2.5) is a subject of great concern due to rapid urbanization and industrialization. To evaluate the chemical characteristics and sources of PM2.5-bound trace elements (TEs) in PM2.5, chemical fractions of two-year (2019–2020) key TEs (Al, Si, Ca, Fe, Ti, K, S, P, Mn, Ni, V, Cr, Cu, Zn and Pb) were investigated. A four-step sequential extraction method was adopted to extract and analyse TEs exchangeable, reducible, oxidisable and residual fractions using inductively coupled plasma optical emission spectrometry. Positive Matrix Factorization was applied to the fractional concentrations of individual elements to apportion TE sources in PM2.5. The model resolved factors were identified as i) mineral dust ii) agricultural crop burning residues iii) vehicular emission iv) coal combustion residues, and v) industrial emission. Mobility of elements from geogenic sources increased during 2020 (COVID 19 lockdowns year), likely due to the formation of soluble secondary inorganic species, while mobility of elements from anthropogenic sources decreased. These findings suggest that anthropogenic activities influence not only TE abundance but also their solubility and bioavailability. [Display omitted] •Trace element (TE) solubility fractions apportioned to five factors using USEPA PMF5.•Solubility of geogenic TEs attributed to secondary inorganic species formation.•Anthropogenic activities drive TE abundance, solubility, and bioavailability.•Soluble TE better reflects health risks than total TE concentrations.
Heavy metal pollution in fine particulate matter (PM ) is a subject of great concern due to rapid urbanization and industrialization. To evaluate the chemical characteristics and sources of PM -bound trace elements (TEs) in PM chemical fractions of two-year (2019-2020) key TEs (Al, Si, Ca, Fe, Ti, K, S, P, Mn, Ni, V, Cr, Cu, Zn and Pb) were investigated. A four-step sequential extraction method was adopted to extract and analyse TEs exchangeable, reducible, oxidisable and residual fractions using inductively coupled plasma optical emission spectrometry. Positive Matrix Factorization was applied to the fractional concentrations of individual elements to apportion TE sources in PM The model resolved factors were identified as i) mineral dust ii) agricultural crop burning residues iii) vehicular emission iv) coal combustion residues, and v) industrial emission. Mobility of elements from geogenic sources increased during 2020 (COVID 19 lockdowns year), likely due to the formation of soluble secondary inorganic species, while mobility of elements from anthropogenic sources decreased. These findings suggest that anthropogenic activities influence not only TE abundance but also their solubility and bioavailability.
Heavy metal pollution in fine particulate matter (PM2.5) is a subject of great concern due to rapid urbanization and industrialization. To evaluate the chemical characteristics and sources of PM2.5-bound trace elements (TEs) in PM2.5, chemical fractions of two-year (2019 - 2020) key TEs (Al, Si, Ca, Fe, Ti, K, S, P, Mn, Ni, V, Cr, Cu, Zn and Pb) were investigated. A four-step sequential extraction method was adopted to extract and analyse TEs exchangeable, reducible, oxidisable and residual fractions using inductively coupled plasma optical emission spectrometry. Positive Matrix Factorization was applied to the fractional concentrations of individual elements to apportion TE sources in PM2.5. The model resolved factors were identified as i) mineral dust ii) agricultural crop burning residues iii) vehicular emission iv) coal combustion residues, and v) industrial emission. Mobility of elements from geogenic sources increased during 2020 (COVID 19 lockdowns year), likely due to the formation of soluble secondary inorganic species, while mobility of elements from anthropogenic sources decreased. These findings suggest that anthropogenic activities influence not only TE abundance but also their solubility and bioavailability.Heavy metal pollution in fine particulate matter (PM2.5) is a subject of great concern due to rapid urbanization and industrialization. To evaluate the chemical characteristics and sources of PM2.5-bound trace elements (TEs) in PM2.5, chemical fractions of two-year (2019 - 2020) key TEs (Al, Si, Ca, Fe, Ti, K, S, P, Mn, Ni, V, Cr, Cu, Zn and Pb) were investigated. A four-step sequential extraction method was adopted to extract and analyse TEs exchangeable, reducible, oxidisable and residual fractions using inductively coupled plasma optical emission spectrometry. Positive Matrix Factorization was applied to the fractional concentrations of individual elements to apportion TE sources in PM2.5. The model resolved factors were identified as i) mineral dust ii) agricultural crop burning residues iii) vehicular emission iv) coal combustion residues, and v) industrial emission. Mobility of elements from geogenic sources increased during 2020 (COVID 19 lockdowns year), likely due to the formation of soluble secondary inorganic species, while mobility of elements from anthropogenic sources decreased. These findings suggest that anthropogenic activities influence not only TE abundance but also their solubility and bioavailability.
ArticleNumber 126823
Author Haswani, Diksha
Sunder Raman, Ramya
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  email: ramyasr@iiserb.ac.in
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Keywords Central India
Fractionated heavy metals
PM2.5
Sequential extraction
Biogeochemical cycles
Bhopal
Health risk
PM(2.5)
Language English
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Snippet Heavy metal pollution in fine particulate matter (PM2.5) is a subject of great concern due to rapid urbanization and industrialization. To evaluate the...
Heavy metal pollution in fine particulate matter (PM ) is a subject of great concern due to rapid urbanization and industrialization. To evaluate the chemical...
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SubjectTerms Bhopal
Biogeochemical cycles
Central India
Fractionated heavy metals
Health risk
PM2.5
Sequential extraction
Title Understanding PM-bound trace element solubilities: Controls, anthropogenic and natural sources
URI https://dx.doi.org/10.1016/j.envpol.2025.126823
https://www.ncbi.nlm.nih.gov/pubmed/40653142
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