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Effect of Nitrogen Amendment on Respiration and Respiratory Quotient (RQ) in Three Hydrocarbon Contaminated Soils of Different Type

Effect of Nitrogen Amendment on Respiration and Respiratory Quotient (RQ) in Three Hydrocarbon Contaminated Soils of Different Type

Thomas Aspray, Agnieszka Gluszek, David Carvalho

Chemosphere. 2008 Jun;72(6):947-51.

PMID: 18462777

Abstract:

Three soil types (sandy gravel, silty clay and sandy loam) from sites historically contaminated with total petroleum hydrocarbon (TPH) were amended with NH(4)NO(3) at concentrations ranging from 16 to 2133 mg/kg soil(dry weight). Microbial activity was measured as O(2) consumption and CO(2) production in order to assess nitrogen limitation. Although activity was stimulated in all three soils under NH(4)NO(3) amendment (after 72 h), the level of nitrogen required was soil specific. For the sandy gravel and silty clay soils, O(2) consumption and CO(2) production both showed enhanced microbial activity when amended with 16 mg/kg soil(dry weight) NH(4)NO(3), whereas, these two parameters gave differing results for the sandy loam soil. Specifically, CO(2) production and O(2) consumption were stimulated with 66 mg/kg and 133 mg/kg soil(dry weight) of NH(4)NO(3) respectively. In addition, respiratory quotient kinetic analysis suggested different decomposition processes occurring in this soil under different NH(4)NO(3) amendment concentrations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AS2121181	TPH - Sandy Loam 4			Price

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