Lookup NU author(s): Professor David Werner
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The sorption efficiency and possible secondary effects of activated carbon (AC) (ø 63–200 μm) was studied withLumbriculus variegatusin three PCB contaminated sediments applying long AC-sediment contact time (3 years). AC amendment efficiently reduced PCB bioavailability as determined with both,L. variegatusbioaccumulation test and passive samplers. However, dose related secondary effects of AC on egestion rate and biomass were observed (applied doses 0.25% and 2.5% sediment dry weight). The sorption capacity and secondary effects remained similar when the experiments were repeated after three years of AC-sediment contact time. Further, transmission electron microscopy (TEM) samples revealed morphological changes in theL. variegatusgut wall microvilli layer. Sediment properties affected both sorption efficiency and secondary effects, but 2.5% AC addition had significant effects regardless of the sediment. In, conclusion, AC is an efficient and stable sorbent to decrease the bioavailability of PCBs. However, sediment dwelling organisms, such as Oligochaete worms in this study, may be sensitive to the carbon amendments. The secondary effects and possible morphological changes in benthic organisms should not be overlooked as in many cases they form the basis of the aquatic food webs.
Author(s): Nybom I, Waissi-Leinonen G, Mäenpää K, Leppänen MT, Kukkonen JWK, Werner D, Akkanen J
Publication type: Article
Publication status: Published
Journal: Water Research
Print publication date: 15/11/2015
Online publication date: 29/08/2015
Acceptance date: 22/08/2015
Date deposited: 19/09/2015
ISSN (print): 0043-1354
ISSN (electronic): 1879-2448
Publisher: IWA Publishing
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