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

Journal of Hazardous Materials
Martina FurdekM Monperrus

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.

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Citations

Jun 21, 2017·Marine Pollution Bulletin·Marion AbrahamDetlef Schulz-Bull
Aug 30, 2019·Environmental Science and Pollution Research International·Malgorzata M FormalewiczDaniela Berto
Feb 6, 2017·Environmental Science and Pollution Research International·Liping FangDongsheng Wang
Jan 29, 2019·Marine Pollution Bulletin·Akere Taiwo HassanKrishnakumar Periyadan
Aug 23, 2019·Ecotoxicology and Environmental Safety·Kęstutis JokšasEva Raudonytė-Svirbutavičienė

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