EcoSystems Environmental Management Services Ltd, 8 Rasheed Alaba Williams Street, Off Admiralty Way, Lekki-Peninsula, Lagos, Nigeria; University of Ilorin, Department of Microbiology, Ilorin, Kwara, Nigeria; Lancaster University, Lancaster Environment Ce
Ogbonnaya, O.U., EcoSystems Environmental Management Services Ltd, 8 Rasheed Alaba Williams Street, Off Admiralty Way, Lekki-Peninsula, Lagos, Nigeria, Lancaster University, Lancaster Environment Centre Bailrigg, Lancaster, United Kingdom; Adebisi, O.O., University of Ilorin, Department of Microbiology, Ilorin, Kwara, Nigeria, Lancaster University, Lancaster Environment Centre Bailrigg, Lancaster, United Kingdom; Semple, K.T., Lancaster University, Lancaster Environment Centre Bailrigg, Lancaster, United Kingdom
Biochar is a carbon rich product from the incomplete combustion of biomass and it has been shown to reduce bioavailability of organic contaminants through adsorption. This study investigated the influence of 0%, 1%, 5% and 10% of two different particle sized wood biochars (≤2 mm and 3-7 mm) on the bioaccessibility of 14C-phenanthrene (10 mg kg-1) in aged soil. The extent of 14C-phenanthrene mineralisation by phenanthrene-degrading Pseudomonas sp. inoculum was monitored over a 14 day period in respirometric assays and compared to hydroxypropyl-β-cyclodextrin (HPCD) aqueous extraction. Notably, biochar amendments showed significant reduction in extents of mineralisation and HPCD extraction. Linear correlations between HPCD extractability and the total amount mineralised revealed good correlations, with 2 mm biochar showing a best fit (r2 = 0.97, slope = 1.11, intercept = 1.72). Biochar reduced HPCD extractability and bioaccessibility of 14C-phenanthrene to microorganisms in a similar manner. Biochar can aid risk reduction to phenanthrene exposure to biota in soil and HPCD can serve as a useful tool to assess the extent of exposure in biochar-amended soils. © 2014 the Partner Organisations.
2 hydroxypropyl beta cyclodextrin; adsorbent; biochar; phenanthrene c 14; radioisotope; unclassified drug; biochar; charcoal; phenanthrene; phenanthrene derivative; soil; soil pollutant; aged soil; aqueous solution; Article; bioaccessibility; biomineralization; controlled study; extraction; nonhuman; Pseudomonas; reduction; respirometry; soil; soil amendment; soil inoculation; analysis; bioremediation; chemistry; microbiology; soil; soil pollutant; Biodegradation, Environmental; Charcoal; Phenanthrenes; Soil; Soil Microbiology; Soil Pollutants