Using response surface methodology to assess the effects of iron and spent mushroom substrate on arsenic phytotoxicity in lettuce (Lactuca sativa L.)

Namin Koo, Hun Je Jo, Sang Hwan Lee, Jeong Gyu Kim

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    The effects of iron (Fe) and spent mushroom substrate (SMS) arsenic (As) phytotoxicity towards lettuce in artificial soils were investigated to separate the adverse soil parameters relating to As toxicity using a response surface methodology. SMS induced the root elongation of lettuce in both control and As-treated soils. However, in phytotoxicity test using a median effective concentration (EC50) of As, Fe and the interaction between both parameters (Fe SMS) significantly affected EC50, which explained 71% and 23% of the response, respectively. The refined model was as follows: EC50 of As (mgkg-1)=10.99+60.03×Fe-10.50×Fe SMS. The results confirmed that the soil parameters relating to the As mobility in soils were important factors affecting its toxicity. In conclusion, Fe significantly reduced the As phytotoxicity. However, although SMS enhanced the root elongation, SMS in As-treated soils decreased EC50 of As on the root growth via its interaction with Fe. Despite the limitations of the artificial soils and range of parameters studied, the application of this statistical tool can be considered a powerful and efficient technique for interpretation and prediction of the complicated results caused by the interactions between many factors within the soil environments.

    Original languageEnglish
    Pages (from-to)381-387
    Number of pages7
    JournalJournal of hazardous materials
    Volume192
    Issue number1
    DOIs
    Publication statusPublished - 2011 Aug 15

    Bibliographical note

    Funding Information:
    This research was financially supported by grant as “Development of the Integrated Physicochemical-Biological Technology for Remediation of Heavy Metal Contaminated Arable Soils” to J.G. Kim from the Mine Reclamation Corporation and partly by a grant from Korea University.

    Keywords

    • Arsenic
    • Iron
    • Organic matter
    • Phytotoxicity
    • Response surface model

    ASJC Scopus subject areas

    • Environmental Engineering
    • Environmental Chemistry
    • Waste Management and Disposal
    • Pollution
    • Health, Toxicology and Mutagenesis

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