Document Type

Journal Article

Department/Unit

Department of Biology

Title

Fate of 14C–Pyrene in soil–plant system amended with pig manure compost and Tween 80: A growth chamber study

Language

English

Abstract

This paper evaluated the effects of a pig manure compost (PMC) and a nonionic surfactant Tween 80 on the fate of 14C-Pyrene (Pyr) in a soil-plant system (Agropyron elongatum). Soils spiked with 14C-4, 5, 9, 10-Pyr were amended with 7.5% (w/w) PMC together with or without 100 mg kg-1 of Tween 80. Unplanted soil without amendments was set as the control. Gas phases of the systems were monitored for 14CO2 over a 60 days period. The impact of PMC and Tween 80 on the apparent loss of the PAH and the distribution of 14C-activity in the systems was studied. 14C-activity associated with different soil fractions was further examined by using methyl-isobutyl-ketone (MIBK) fractionation method. The results showed that the addition of PMC could increase the dissipation of Pyr in vegetated soil from 12.1% to 58.7%, while the co-addition of Tween 80 and PMC could further enhance the dissipation to 90.3%. Pyr dissipation in soil was correlated with the mineralization of 14C-Pyr, indicating that Pyr dissipation was mainly due to mineralization. A higher formation of water-extractable metabolites was observed in soil amended with PMC and Tween 80, and this was correlated with a higher biomass accumulation of 14C-activity and higher bound residue formation in the soil. Overall, this study suggested that the co-application of PMC and Tween 80 could improve phytoremediation of Pyr-contaminated soil. © 2008.

Keywords

Humin, Nonionic surfactant, Phytoremediation, Polycyclic aromatic hydrocarbons, Rhizosphere

Publication Date

2008

Source Publication Title

Bioresource Technology

Volume

99

Issue

17

Start Page

8406

End Page

8412

Publisher

Elsevier

DOI

10.1016/j.biortech.2008.02.036

ISSN (print)

09608524

ISSN (electronic)

18732976

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