Products and stability of phosphate reactions with lead under freeze-thaw cycling in simple systems.

Erla Hafsteinsdóttir, Duanne White, Damian Gore, Scott Stark

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    Orthophosphate �xation of metal contaminated soils in environments that undergo freezeethaw cycles is understudied. Freezeethaw cycling potentially in�uences the reaction rate, mineral chemical stability and physical breakdown of particles during �xation. This study determines what products form when phosphate (triple superphosphate [Ca(H2PO4)2] or sodium phosphate [Na3PO4]) reacts with lead (PbSO4 or PbCl2) in simple chemical systems in vitro, and assesses potential changes in formation during freezee thaw cycles. Systems were subjected to multiple freezeethaw cycles from �10 C to �20 C and then analysed by X-ray diffractometry. Pyromorphite formed in all systems and was stable over multiple freezeethaw cycles. Low temperature lead orthophosphate reaction ef�ciency varied according to both phosphate and lead source; the most time-ef�cient pyromorphite formation was observed when PbSO4 and Na3PO4 were present together. These �ndings have implications for the manner in which metal contaminated materials in freezing ground can be treated with phosphate.
    Original languageEnglish
    Pages (from-to)3496-3503
    Number of pages8
    JournalEnvironmental Pollution
    Volume159
    Issue number2
    DOIs
    Publication statusPublished - 2011

    Fingerprint

    Phosphates
    Lead
    Metals
    Chemical stability
    Freezing
    X ray diffraction analysis
    Reaction rates
    Minerals
    Soil
    Sodium
    X-Rays
    Soils
    Temperature
    pyromorphite

    Cite this

    Hafsteinsdóttir, Erla ; White, Duanne ; Gore, Damian ; Stark, Scott. / Products and stability of phosphate reactions with lead under freeze-thaw cycling in simple systems. In: Environmental Pollution. 2011 ; Vol. 159, No. 2. pp. 3496-3503.
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    abstract = "Orthophosphate {\^a}�£xation of metal contaminated soils in environments that undergo freezeethaw cycles is understudied. Freezeethaw cycling potentially in{\^a}�£uences the reaction rate, mineral chemical stability and physical breakdown of particles during {\^a}�£xation. This study determines what products form when phosphate (triple superphosphate [Ca(H2PO4)2] or sodium phosphate [Na3PO4]) reacts with lead (PbSO4 or PbCl2) in simple chemical systems in vitro, and assesses potential changes in formation during freezee thaw cycles. Systems were subjected to multiple freezeethaw cycles from {\^a}�£10 C to {\^a}�£20 C and then analysed by X-ray diffractometry. Pyromorphite formed in all systems and was stable over multiple freezeethaw cycles. Low temperature lead orthophosphate reaction ef{\^a}�£ciency varied according to both phosphate and lead source; the most time-ef{\^a}�£cient pyromorphite formation was observed when PbSO4 and Na3PO4 were present together. These {\^a}�£ndings have implications for the manner in which metal contaminated materials in freezing ground can be treated with phosphate.",
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    Products and stability of phosphate reactions with lead under freeze-thaw cycling in simple systems. / Hafsteinsdóttir, Erla; White, Duanne; Gore, Damian; Stark, Scott.

    In: Environmental Pollution, Vol. 159, No. 2, 2011, p. 3496-3503.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Products and stability of phosphate reactions with lead under freeze-thaw cycling in simple systems.

    AU - Hafsteinsdóttir, Erla

    AU - White, Duanne

    AU - Gore, Damian

    AU - Stark, Scott

    PY - 2011

    Y1 - 2011

    N2 - Orthophosphate �xation of metal contaminated soils in environments that undergo freezeethaw cycles is understudied. Freezeethaw cycling potentially in�uences the reaction rate, mineral chemical stability and physical breakdown of particles during �xation. This study determines what products form when phosphate (triple superphosphate [Ca(H2PO4)2] or sodium phosphate [Na3PO4]) reacts with lead (PbSO4 or PbCl2) in simple chemical systems in vitro, and assesses potential changes in formation during freezee thaw cycles. Systems were subjected to multiple freezeethaw cycles from �10 C to �20 C and then analysed by X-ray diffractometry. Pyromorphite formed in all systems and was stable over multiple freezeethaw cycles. Low temperature lead orthophosphate reaction ef�ciency varied according to both phosphate and lead source; the most time-ef�cient pyromorphite formation was observed when PbSO4 and Na3PO4 were present together. These �ndings have implications for the manner in which metal contaminated materials in freezing ground can be treated with phosphate.

    AB - Orthophosphate �xation of metal contaminated soils in environments that undergo freezeethaw cycles is understudied. Freezeethaw cycling potentially in�uences the reaction rate, mineral chemical stability and physical breakdown of particles during �xation. This study determines what products form when phosphate (triple superphosphate [Ca(H2PO4)2] or sodium phosphate [Na3PO4]) reacts with lead (PbSO4 or PbCl2) in simple chemical systems in vitro, and assesses potential changes in formation during freezee thaw cycles. Systems were subjected to multiple freezeethaw cycles from �10 C to �20 C and then analysed by X-ray diffractometry. Pyromorphite formed in all systems and was stable over multiple freezeethaw cycles. Low temperature lead orthophosphate reaction ef�ciency varied according to both phosphate and lead source; the most time-ef�cient pyromorphite formation was observed when PbSO4 and Na3PO4 were present together. These �ndings have implications for the manner in which metal contaminated materials in freezing ground can be treated with phosphate.

    KW - Metal fixation

    KW - Freeze thaw

    KW - Lead minerals

    KW - Phosphate

    KW - Pyromorphite

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    DO - 10.1016/j.envpol.2011.08.026

    M3 - Article

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