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Bioavailability and bioaccessibility of polycyclic aromatic hydrocarbons from (post-pyrolytically treated) biochars
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Number of Authors: 7
2017 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 174, 700-707 p.Article in journal (Refereed) Published
Abstract [en]

Bioaccessibility data of PAHs from biochar produced under real world conditions is scarce and the influence of feedstock and various post-pyrolysis treatments common in agriculture, such as co composting or lacto-fermentation to produce silage fodder, on their bioavailability and bioaccessibility has hardly been studied. The total (C-total), and freely dissolved (i.e., bioavailable) concentrations (C-free) of the sum of 16 US EPA PAHs of 43 biochar samples produced and treated in such ways ranged from 0.4 to almost 2000 mg/kg, and from 12 to 81 ng/L, respectively, which resulted in very high biochar-water partition coefficients (4.2 < log K-D < 8.8 L/kg) for individual PAHs. Thirty three samples were incubated in contaminant traps that combined a diffusive carrier and a sorptive sink. Incubations yielded samples only containing desorption-resistant PAHs (C-res). The desorption resistant PAH fraction was dominant, since only eight out of 33 biochar samples showed statistically significant bioaccessible fractions (f(bioaccessible) = 1 - C-res/C-total). Bioavailability correlated positively with C-total/surface area. Other relationships of bioavailability and accessibility with the investigated post-pyrolysis processes or elemental composition could not be found. PAH exposure was very limited (low C-free, high C-res) for all samples with low to moderate C-total whereas higher exposure was determined in some biochars with C-total > 10 mg/kg.

Place, publisher, year, edition, pages
2017. Vol. 174, 700-707 p.
Keyword [en]
Organic pollutants, Agricultural practice, Biochar as feed additive, Biochar mixtures, Post-processing
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-142365DOI: 10.1016/j.chemosphere.2017.02.014ISI: 000397076000075PubMedID: 28199946OAI: oai:DiVA.org:su-142365DiVA: diva2:1093319
Conference
BFR Symposium, Beijing, Peoples Republic of China, April 22-24, 2015
Available from: 2017-05-05 Created: 2017-05-05 Last updated: 2017-05-05Bibliographically approved

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Cornelissen, Gerard
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Department of Applied Environmental Science (ITM)
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