Factors influencing arsenic concentrations and species in mangrove surface sediments from south-east NSW, Australia

S Hettiarachchi, Bill MAHER

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Arsenic concentrations and speciation of 55 mangrove surface sediment samples from the south-eastern coast of NSW, Australia, have been measured. Arsenic concentrations were in the range 1.6–8.6 μg/g dry mass. All arsenic concentration values were well below 20 μg/g, the ANZEC/ARMCANZ interim sediment quality guideline-low trigger value. The bulk sediment pH was 6.0–7.3 and Eh −80 to −260 mV. The sediments contained variable silt–clay (2–30 % w/w), iron (668–12721 μg/g), manganese (1–115 μg/g), sulphur (70–18400 μg/g) and carbon (5–90 mg/g) concentrations. Arsenic concentrations correlated with silt and clay content, iron and manganese concentrations, indicating silt–clay particles covered and coated with iron and manganese (oxy) hydroxides scavenged arsenic. Arsenic extracted with 0.5 M phosphoric acid (68–95 %) was present only as inorganic arsenic (55–91 %), indicating that other arsenic species such as arsenobetaine derived from marine animal tissues rapidly degrade in sediments. The unextractable arsenic was correlated with increases in organic carbon, iron and manganese content. In conclusion, the cycling of arsenic in mangrove sediments is essentially the cycling of inorganic arsenic and primarily controlled by the redox cycling of carbon, sulphur, iron and manganese.

    Original languageEnglish
    Pages (from-to)209-219
    Number of pages11
    JournalEnvironmental Geochemistry and Health
    Volume39
    Issue number1
    DOIs
    Publication statusPublished - 2017

    Fingerprint

    Arsenic
    mangrove
    arsenic
    Sediments
    Manganese
    sediment
    manganese
    Iron
    iron
    Carbon
    Sulfur
    Hydroxides
    sulfur
    Silt
    carbon
    Phosphoric acid
    Organic carbon
    Oxidation-Reduction
    hydroxide
    Coastal zones

    Cite this

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    title = "Factors influencing arsenic concentrations and species in mangrove surface sediments from south-east NSW, Australia",
    abstract = "Arsenic concentrations and speciation of 55 mangrove surface sediment samples from the south-eastern coast of NSW, Australia, have been measured. Arsenic concentrations were in the range 1.6–8.6 μg/g dry mass. All arsenic concentration values were well below 20 μg/g, the ANZEC/ARMCANZ interim sediment quality guideline-low trigger value. The bulk sediment pH was 6.0–7.3 and Eh −80 to −260 mV. The sediments contained variable silt–clay (2–30 {\%} w/w), iron (668–12721 μg/g), manganese (1–115 μg/g), sulphur (70–18400 μg/g) and carbon (5–90 mg/g) concentrations. Arsenic concentrations correlated with silt and clay content, iron and manganese concentrations, indicating silt–clay particles covered and coated with iron and manganese (oxy) hydroxides scavenged arsenic. Arsenic extracted with 0.5 M phosphoric acid (68–95 {\%}) was present only as inorganic arsenic (55–91 {\%}), indicating that other arsenic species such as arsenobetaine derived from marine animal tissues rapidly degrade in sediments. The unextractable arsenic was correlated with increases in organic carbon, iron and manganese content. In conclusion, the cycling of arsenic in mangrove sediments is essentially the cycling of inorganic arsenic and primarily controlled by the redox cycling of carbon, sulphur, iron and manganese.",
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    Factors influencing arsenic concentrations and species in mangrove surface sediments from south-east NSW, Australia. / Hettiarachchi, S; MAHER, Bill.

    In: Environmental Geochemistry and Health, Vol. 39, No. 1, 2017, p. 209-219.

    Research output: Contribution to journalArticle

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    AU - MAHER, Bill

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    N2 - Arsenic concentrations and speciation of 55 mangrove surface sediment samples from the south-eastern coast of NSW, Australia, have been measured. Arsenic concentrations were in the range 1.6–8.6 μg/g dry mass. All arsenic concentration values were well below 20 μg/g, the ANZEC/ARMCANZ interim sediment quality guideline-low trigger value. The bulk sediment pH was 6.0–7.3 and Eh −80 to −260 mV. The sediments contained variable silt–clay (2–30 % w/w), iron (668–12721 μg/g), manganese (1–115 μg/g), sulphur (70–18400 μg/g) and carbon (5–90 mg/g) concentrations. Arsenic concentrations correlated with silt and clay content, iron and manganese concentrations, indicating silt–clay particles covered and coated with iron and manganese (oxy) hydroxides scavenged arsenic. Arsenic extracted with 0.5 M phosphoric acid (68–95 %) was present only as inorganic arsenic (55–91 %), indicating that other arsenic species such as arsenobetaine derived from marine animal tissues rapidly degrade in sediments. The unextractable arsenic was correlated with increases in organic carbon, iron and manganese content. In conclusion, the cycling of arsenic in mangrove sediments is essentially the cycling of inorganic arsenic and primarily controlled by the redox cycling of carbon, sulphur, iron and manganese.

    AB - Arsenic concentrations and speciation of 55 mangrove surface sediment samples from the south-eastern coast of NSW, Australia, have been measured. Arsenic concentrations were in the range 1.6–8.6 μg/g dry mass. All arsenic concentration values were well below 20 μg/g, the ANZEC/ARMCANZ interim sediment quality guideline-low trigger value. The bulk sediment pH was 6.0–7.3 and Eh −80 to −260 mV. The sediments contained variable silt–clay (2–30 % w/w), iron (668–12721 μg/g), manganese (1–115 μg/g), sulphur (70–18400 μg/g) and carbon (5–90 mg/g) concentrations. Arsenic concentrations correlated with silt and clay content, iron and manganese concentrations, indicating silt–clay particles covered and coated with iron and manganese (oxy) hydroxides scavenged arsenic. Arsenic extracted with 0.5 M phosphoric acid (68–95 %) was present only as inorganic arsenic (55–91 %), indicating that other arsenic species such as arsenobetaine derived from marine animal tissues rapidly degrade in sediments. The unextractable arsenic was correlated with increases in organic carbon, iron and manganese content. In conclusion, the cycling of arsenic in mangrove sediments is essentially the cycling of inorganic arsenic and primarily controlled by the redox cycling of carbon, sulphur, iron and manganese.

    KW - Arsenic

    KW - Australia

    KW - Geochemical controls

    KW - Mangroves

    KW - Sediments

    KW - Speciation

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