- Title
- Buffered cyclodextrin extraction of ¹⁴C-phenanthrene from black carbon amended soil
- Creator
- Yu, Linbo; Vázquez-Cuevas, Gabriela; Duan, Luchun; Semple, Kirk T.
- Relation
- Environmental Technology & Innovation Vol. 6, Issue November 2016, p. 177-184
- Publisher Link
- http://dx.doi.org/10.1016/j.eti.2016.09.002
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2016
- Description
- The presence of black carbon (BC) in soil drastically reduced the mineralisation of ¹⁴C-phenanthrene and its extractability by hydroxypropyl-ββ-cyclodextrin (HPCD) extractions. This study also tested the effects of pH on the HPCD extraction of ¹⁴C-phenanthrene in soils with BC. Extractions using 60 mM HPCD solutions prepared in deionised water (pH 5.89) and phosphate buffers (pH 7 and 8) were conducted on ¹⁴C-phenanthrene-spiked soils amended with three different types of BC (1% dry weight) after 1, 25, and 50 d of ageing. Biodegradation assays using a Pseudomonas sp. strain were also carried out. Results showed that after 1 and 25 d, HPCD at pH 7 extracted significantly more View the MathML source14C-phenanthrene (p<0.05)(p<0.05) from BC-amended soils than the other two solutions (un-buffered and pH 8), while HPCD at pH 8 extracted statistically similar (p>0.05)(p>0.05) amounts of phenanthrene compared to the un-buffered solution. At 50 d, HPCD at pH 8 generally extracted more ¹⁴C-phenanthrene from all treatments. It was proposed that higher pH promoted the dissolution of soil organic matter (SOM), leading to a greater solubility of phenanthrene in the solvent phase and enhancing the extractive capability of HPCD solutions. Although correlations between extractability and biodegradability of ¹⁴C-phenanthrene in BC-amended soils were poor, increasing pH was demonstrated a viable approach to enhancing HPCD extractive capability for the ¹⁴C-PAH from soil with BC.
- Subject
- black carbon; phenanthrene; hydroxypropyl-β-cyclodextrin extraction (HPCD); mineralisation; pH
- Identifier
- http://hdl.handle.net/1959.13/1336987
- Identifier
- uon:27744
- Identifier
- ISSN:2352-1864
- Language
- eng
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