From chemical monitoring to biological meaning: extraction techniques and the biological interpretation of sediment chemistry data from the Casey region

Martin J. Riddle, Rebecca C. Scouller, Ian Snape, Jonathan S. Stark, Sharon M. Kratzmann, Scott C. Stark, Catherine K. King, Sabine Duquesne, Damian B. Gore

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    Abstract

    Although chemical studies are included routinely in environmental monitoring programs, chemical data are often not absolute values with unambiguous ecological meaning. Nevertheless, most guidelines that govern permissible discharge concentrations or decisions about whether to remediate contaminated sites are based on the concentrations of contaminants in sediments or water rather than more involved and costly studies based on the identification of biological impacts. The example of heavy metal contamination leaching from an abandoned waste disposal site into the marine environment near Casey Station is used to explore the effects of extraction method (partial extraction using 1M HCl and a total digest with (HF + HNO₃ + HC1) on the interpretation of heavy metal analyses. Data from the partial extraction most clearly distinguished between control and impacted sites. There was a close association between 1M HC1 heavy metal data from sediments and heavy metals concentrations in tissues of the bivalve, Laternula elliptica and the heart urchins, Abatus nimrodi and A. ingens, collected at the same sites. There was no such association between the total digest data and the biota. Unless levels of chemicals in the environment are of concern per se, chemical monitoring must reflect effects on the biota. Analyses of heavy metals based on partial extraction using 1M HC1 provide biologically meaningful data. When the dose/response characteristics of Antarctic biota are better understood, data from partial extractions may be a useful proxy for monitoring the biological effects of heavy metals.
    Original languageEnglish
    Title of host publicationAntarctic biology in a global context
    Subtitle of host publicationproceedings of the VIIIth SCAR International Biology Symposium
    EditorsA. H. L. Huiskes, W. W. C. Gieskes, J. Rozema, R. M. L. Schorno, S. M. van der Vies, W. J. Wolff
    Place of PublicationLeiden, The Netherlands
    PublisherBackhuys
    Pages285-289
    Number of pages5
    ISBN (Print)905782079X
    Publication statusPublished - 2003
    EventSCAR International Biology Symposium (8th : 2001) - Amsterdam
    Duration: 27 Aug 20011 Sep 2001

    Conference

    ConferenceSCAR International Biology Symposium (8th : 2001)
    CityAmsterdam
    Period27/08/011/09/01

    Keywords

    • Antarctica
    • marine sediment
    • sediment chemistry
    • pollution
    • heavy metals
    • sediments
    • extraction techniques
    • benthos

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