Volatile selenium fluxes from selenium-contaminated sediments in an Australian coastal lake

Jaimie Potts, Larissa Schneider, Jaimie POTTS, Graeme Batley, John Floyd, Bill MAHER

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Overflows from ash dams associated with the operation of coal-fired power stations in Lake Macquarie, NSW, Australia, have been a historical source of selenium to the lake. Although dissolved selenium concentrations have been marginally elevated, sediments are the major sink. Methylation of sedimentary selenium to volatile dimethylselenide (DMSe) is known to be a natural remediation process. Sediments from north of Wyee Bay and the Vales Point Power Station were the subject of field sampling and monitoring to determine the extent to which selenium is being lost to the atmosphere as DMSe. Flux estimates were obtained by trapping volatile selenium species using benthic domes, followed by analysis in the field using a fully automated cryogenic trapping system with atomic fluorescence detection. The detection limit of the system was 0.1ngL-1 for DMSe and 1ngL-1 for dimethyl diselenide (DMDSe). Measurements in both summer and late autumn-early winter showed a distinct seasonal difference, with a higher summer DMSe flux of 53±25ng Se m-2h-1 (±s.d.) compared with 8±5ng Se m-2h-1 in late autumn-early winter. No DMDSe was detected. These fluxes are similar to those measured in Europe and North America, and represent an annual loss of 1.3kg of selenium per year from the nearby lake area. Lake-wide this would represent a significant loss to the atmosphere.
    Original languageEnglish
    Pages (from-to)68-75
    Number of pages8
    JournalEnvironmental Chemistry
    Volume13
    Issue number1
    DOIs
    Publication statusPublished - 2016

    Fingerprint

    Selenium
    selenium
    Lakes
    Sediments
    Fluxes
    lake
    sediment
    Ashes
    trapping
    autumn
    Methylation
    atmosphere
    Coal
    coal-fired power plant
    winter
    Domes
    methylation
    summer
    Remediation
    Cryogenics

    Cite this

    Potts, Jaimie ; Schneider, Larissa ; POTTS, Jaimie ; Batley, Graeme ; Floyd, John ; MAHER, Bill. / Volatile selenium fluxes from selenium-contaminated sediments in an Australian coastal lake. In: Environmental Chemistry. 2016 ; Vol. 13, No. 1. pp. 68-75.
    @article{8888661bafd04673b14231eb077f7255,
    title = "Volatile selenium fluxes from selenium-contaminated sediments in an Australian coastal lake",
    abstract = "Overflows from ash dams associated with the operation of coal-fired power stations in Lake Macquarie, NSW, Australia, have been a historical source of selenium to the lake. Although dissolved selenium concentrations have been marginally elevated, sediments are the major sink. Methylation of sedimentary selenium to volatile dimethylselenide (DMSe) is known to be a natural remediation process. Sediments from north of Wyee Bay and the Vales Point Power Station were the subject of field sampling and monitoring to determine the extent to which selenium is being lost to the atmosphere as DMSe. Flux estimates were obtained by trapping volatile selenium species using benthic domes, followed by analysis in the field using a fully automated cryogenic trapping system with atomic fluorescence detection. The detection limit of the system was 0.1ngL-1 for DMSe and 1ngL-1 for dimethyl diselenide (DMDSe). Measurements in both summer and late autumn-early winter showed a distinct seasonal difference, with a higher summer DMSe flux of 53±25ng Se m-2h-1 (±s.d.) compared with 8±5ng Se m-2h-1 in late autumn-early winter. No DMDSe was detected. These fluxes are similar to those measured in Europe and North America, and represent an annual loss of 1.3kg of selenium per year from the nearby lake area. Lake-wide this would represent a significant loss to the atmosphere.",
    author = "Jaimie Potts and Larissa Schneider and Jaimie POTTS and Graeme Batley and John Floyd and Bill MAHER",
    year = "2016",
    doi = "10.1071/EN14228",
    language = "English",
    volume = "13",
    pages = "68--75",
    journal = "Environmental Chemistry",
    issn = "1448-2517",
    publisher = "CSIRO",
    number = "1",

    }

    Volatile selenium fluxes from selenium-contaminated sediments in an Australian coastal lake. / Potts, Jaimie; Schneider, Larissa; POTTS, Jaimie; Batley, Graeme; Floyd, John; MAHER, Bill.

    In: Environmental Chemistry, Vol. 13, No. 1, 2016, p. 68-75.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Volatile selenium fluxes from selenium-contaminated sediments in an Australian coastal lake

    AU - Potts, Jaimie

    AU - Schneider, Larissa

    AU - POTTS, Jaimie

    AU - Batley, Graeme

    AU - Floyd, John

    AU - MAHER, Bill

    PY - 2016

    Y1 - 2016

    N2 - Overflows from ash dams associated with the operation of coal-fired power stations in Lake Macquarie, NSW, Australia, have been a historical source of selenium to the lake. Although dissolved selenium concentrations have been marginally elevated, sediments are the major sink. Methylation of sedimentary selenium to volatile dimethylselenide (DMSe) is known to be a natural remediation process. Sediments from north of Wyee Bay and the Vales Point Power Station were the subject of field sampling and monitoring to determine the extent to which selenium is being lost to the atmosphere as DMSe. Flux estimates were obtained by trapping volatile selenium species using benthic domes, followed by analysis in the field using a fully automated cryogenic trapping system with atomic fluorescence detection. The detection limit of the system was 0.1ngL-1 for DMSe and 1ngL-1 for dimethyl diselenide (DMDSe). Measurements in both summer and late autumn-early winter showed a distinct seasonal difference, with a higher summer DMSe flux of 53±25ng Se m-2h-1 (±s.d.) compared with 8±5ng Se m-2h-1 in late autumn-early winter. No DMDSe was detected. These fluxes are similar to those measured in Europe and North America, and represent an annual loss of 1.3kg of selenium per year from the nearby lake area. Lake-wide this would represent a significant loss to the atmosphere.

    AB - Overflows from ash dams associated with the operation of coal-fired power stations in Lake Macquarie, NSW, Australia, have been a historical source of selenium to the lake. Although dissolved selenium concentrations have been marginally elevated, sediments are the major sink. Methylation of sedimentary selenium to volatile dimethylselenide (DMSe) is known to be a natural remediation process. Sediments from north of Wyee Bay and the Vales Point Power Station were the subject of field sampling and monitoring to determine the extent to which selenium is being lost to the atmosphere as DMSe. Flux estimates were obtained by trapping volatile selenium species using benthic domes, followed by analysis in the field using a fully automated cryogenic trapping system with atomic fluorescence detection. The detection limit of the system was 0.1ngL-1 for DMSe and 1ngL-1 for dimethyl diselenide (DMDSe). Measurements in both summer and late autumn-early winter showed a distinct seasonal difference, with a higher summer DMSe flux of 53±25ng Se m-2h-1 (±s.d.) compared with 8±5ng Se m-2h-1 in late autumn-early winter. No DMDSe was detected. These fluxes are similar to those measured in Europe and North America, and represent an annual loss of 1.3kg of selenium per year from the nearby lake area. Lake-wide this would represent a significant loss to the atmosphere.

    U2 - 10.1071/EN14228

    DO - 10.1071/EN14228

    M3 - Article

    VL - 13

    SP - 68

    EP - 75

    JO - Environmental Chemistry

    JF - Environmental Chemistry

    SN - 1448-2517

    IS - 1

    ER -