Long term behaviour and degradation kinetics of tributyltin in a marina sediment.
One-meter sediment cores sampled in a marina have been submitted to extensive characterization and organotin speciation. Geochemical homogeneity has been demonstrated. Butyltin species are present at all depths with a predominance of TBT or MBT in the upper or lower layers, respectively. Seasonal variations of butyltin compounds have been identified and together with a knowledge of local conditions we estimate the sediment layers represent 14 years of deposition. A first order multi-step kinetic model of the sequential degradation of TBT in, successively, DBT, MBT and Sn (IV) is proposed. The half-life of TBT was estimated (on a 14-year period) to be 2.1 years and those of DBT and MBT (on a 5-year period) 1.9 and 1.1 years, respectively.
Sarradin
P M
PM
Laboratoire de Chimie Analytique, Université de Pau et des Pays de l'Adour, France.
Lapaquellerie
Y
Y
Astruc
A
A
Latouche
C
C
Astruc
M
M
D007700:Kinetics; D010150:Paint; D012623:Seawater; D012989:Soil Pollutants / Q000032:analysis*; D013997:Time Factors; D014220:Trialkyltin Compounds / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
D012989:Soil Pollutants; D014220:Trialkyltin Compounds; D014874:Water Pollutants, Chemical; C011559:tributyltin