Mercury speciation in waters and sediments of Lake Murray, Papua New Guinea

Karl Bowles, Simon Apte, William Maher, Jim McNamara

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    The speciation of mercury in Lake Murray, Papua New Guinea and nine surrounding rivers was investigated. Total mercury concentrations in waters (0.52-9.5 ng L-1) and sediments (56-177 ng g-1 dry mass) were similar to those found in other remote lake environments. Total methylmercury (MeHg) concentrations in waters and sediments were also low. Of the 50 water samples analysed during three surveys, only six samples had total MeHg concentrations between 0.1 and 0.64 ng L-1 and 25 of the samples had total MeHg concentrations < 0.05 ng L-1. Methylmercury concentrations were very variable and could not be linked with parameters known to affect mercury methylation such as pH, dissolved organic carbon and sulfate concentrations. A statistically significant and unexplained correlation was observed between filterable MeHg and filterable silicon. Intermittent inputs of turbid water from the Strickland River inject particulates and filterable MeHg into the southern end of Lake Murray. This has resulted in the formation of a depositional footprint that contains higher concentrations of particulate mercury and other elements compared with the rest of the lake
    Original languageEnglish
    Pages (from-to)825-833
    Number of pages9
    JournalMarine and Freshwater Research
    Volume53
    Issue number4
    DOIs
    Publication statusPublished - 2002

    Fingerprint

    Papua New Guinea
    mercury
    lakes
    sediments
    methylmercury compounds
    lake
    methylmercury
    sediment
    particulates
    water
    rivers
    lacustrine environment
    methylation
    silicon
    dissolved organic carbon
    river
    sampling
    footprint
    sulfates
    sulfate

    Cite this

    Bowles, Karl ; Apte, Simon ; Maher, William ; McNamara, Jim. / Mercury speciation in waters and sediments of Lake Murray, Papua New Guinea. In: Marine and Freshwater Research. 2002 ; Vol. 53, No. 4. pp. 825-833.
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    abstract = "The speciation of mercury in Lake Murray, Papua New Guinea and nine surrounding rivers was investigated. Total mercury concentrations in waters (0.52-9.5 ng L-1) and sediments (56-177 ng g-1 dry mass) were similar to those found in other remote lake environments. Total methylmercury (MeHg) concentrations in waters and sediments were also low. Of the 50 water samples analysed during three surveys, only six samples had total MeHg concentrations between 0.1 and 0.64 ng L-1 and 25 of the samples had total MeHg concentrations < 0.05 ng L-1. Methylmercury concentrations were very variable and could not be linked with parameters known to affect mercury methylation such as pH, dissolved organic carbon and sulfate concentrations. A statistically significant and unexplained correlation was observed between filterable MeHg and filterable silicon. Intermittent inputs of turbid water from the Strickland River inject particulates and filterable MeHg into the southern end of Lake Murray. This has resulted in the formation of a depositional footprint that contains higher concentrations of particulate mercury and other elements compared with the rest of the lake",
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    Mercury speciation in waters and sediments of Lake Murray, Papua New Guinea. / Bowles, Karl; Apte, Simon; Maher, William; McNamara, Jim.

    In: Marine and Freshwater Research, Vol. 53, No. 4, 2002, p. 825-833.

    Research output: Contribution to journalArticle

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    T1 - Mercury speciation in waters and sediments of Lake Murray, Papua New Guinea

    AU - Bowles, Karl

    AU - Apte, Simon

    AU - Maher, William

    AU - McNamara, Jim

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    AB - The speciation of mercury in Lake Murray, Papua New Guinea and nine surrounding rivers was investigated. Total mercury concentrations in waters (0.52-9.5 ng L-1) and sediments (56-177 ng g-1 dry mass) were similar to those found in other remote lake environments. Total methylmercury (MeHg) concentrations in waters and sediments were also low. Of the 50 water samples analysed during three surveys, only six samples had total MeHg concentrations between 0.1 and 0.64 ng L-1 and 25 of the samples had total MeHg concentrations < 0.05 ng L-1. Methylmercury concentrations were very variable and could not be linked with parameters known to affect mercury methylation such as pH, dissolved organic carbon and sulfate concentrations. A statistically significant and unexplained correlation was observed between filterable MeHg and filterable silicon. Intermittent inputs of turbid water from the Strickland River inject particulates and filterable MeHg into the southern end of Lake Murray. This has resulted in the formation of a depositional footprint that contains higher concentrations of particulate mercury and other elements compared with the rest of the lake

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