Organotin persistence in contaminated marine sediments and porewaters : In situ degradation study using species-specific stable isotopic tracers

Furdek, Martina; Mikac, Nevenka; Bueno, Maite; Tessier, Emmanuel; Cavalheiro, Joana; Monperrus, Mathilde (2016) Organotin persistence in contaminated marine sediments and porewaters : In situ degradation study using species-specific stable isotopic tracers. Journal of Hazardous Materials, 307 . pp. 263-273. ISSN 0304-3894

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Abstract

This paper provides a comprehensive study of the persistence of butyltins and phenyltins in contaminated marine sediments and presents the first data on their degradation potentials in porewaters. The study’s aim was to explain the different degradation efficiencies of organotin compounds (OTC) in contaminated sediments. The transformation processes of OTC in sediments and porewaters were investigated in a field experiment using species-specific, isotopically enriched organotin tracers. Sediment characteristics (organic carbon content and grain size) were determined to elucidate their influence on the degradation processes. The results of this study strongly suggest that a limiting step in OTC degradation in marine sediments is their desorption into porewaters because their degradation in porewaters occurs notably fast with half-lives of 9.2 days for tributyltin (TBT) in oxic porewaters and 2.9±0.1 and 9.1±0.9 days for dibutyltin (DBT) in oxic and anoxic porewaters, respectively. By controlling the desorption process, organic matter influences the TBT degradation efficiency and consequently defines its persistence in contaminated sediments, which thus increases in sediments rich in organic matter.

Item Type:	Article
Additional Information:	We thank Jelena Dautovic (TOC analyses), Maja Ivanic (granulometric analyses) and Niko Bacic (assistance in sampling). This work has been supported by the Croatian Science Foundation under the project number 7555, and performed in the framework of Croatian-French scientific collaboration supported by the Croatian and French Ministries of Science.
Uncontrolled Keywords:	organotin compounds; tributyltin; degradation kinetics; isotopically enriched tracers; sediments; organic matter
Subjects:	NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Transport i kemodinamika elemenata u tragovima u slatkovodnim i priobalnim sedimentacijskim sustavima-TRACESS Goran Kniewald IP-2013-11-7555 HRZZ
Depositing User:	Martina Furdek Turk
Date Deposited:	06 Dec 2017 14:10
URI:	http://fulir.irb.hr/id/eprint/3717
DOI:	10.1016/j.jhazmat.2015.12.037

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