Effect of nitrogen amendment on respiration and respiratory quotient (RQ) in three hydrocarbon contaminated soils of different type

Thomas J. Aspray, Agnieszka Gluszek, David Carvalho

    Research output: Contribution to journalArticle

    33 Citations (Scopus)

    Abstract

    Three soil types (sandy gravel, silty clay and sandy loam) from sites historically contaminated with total petroleum hydrocarbon (TPH) were amended with NH4NO3 at concentrations ranging from 16 to 2133 mg/kg soil(dry weight). Microbial activity was measured as O-2 consumption and CO2 production in order to assess nitrogen limitation. Although activity was stimulated in all three soils under NH4NO3 amendment (after 72 h), the level of nitrogen required was soil specific. For the sandy gravel and silty clay soils, O-2 consumption and CO2 production both showed enhanced microbial activity when amended with 16 mg/kg soildry weight NH4NO3, whereas, these two parameters gave differing results for the sandy loam soil. Specifically, CO2 production and O-2 consumption were stimulated with 66 mg/kg and 733 mg/kg soildry weight of NH4NO3 respectively. In addition, respiratory quotient kinetic analysis suggested different decomposition processes occurring in this soil under different NH4NO3 amendment concentrations. (C) 2008 Elsevier Ltd. All rights reserved.

    Original languageEnglish
    Pages (from-to)947-951
    Number of pages5
    JournalChemosphere
    Volume72
    Issue number6
    DOIs
    Publication statusPublished - Jun 2008

    Keywords

    • soil respiration
    • total petroleum hydrocarbon
    • bioremediation
    • soil microbial activity
    • respiratory quotient
    • DIESEL-OIL
    • PETROLEUM-HYDROCARBONS
    • NATURAL ATTENUATION
    • BIOLOGICAL-ACTIVITIES
    • MICROBIAL ACTIVITY
    • BIOREMEDIATION
    • BIODEGRADATION
    • RESPIROMETRY
    • BIOSTIMULATION
    • AVAILABILITY

    Cite this