5.4
Organometallic Compounds
5.4.7
Tin
Organometallic Compounds
117
To determine methyltin, butyltin and inorganic tin in Great Bay estuary sediments,
Randall et aI. [346] extracted the freeze dried sediment with 2.5 moll- 1 calcium
chloride and 2.5 mol 1-1 hydrochloric acid and analysed by hydride generation atomic
absorption spectrometry. Detection limits for inorganic tin and tributyltin were
2.2 ng kg- 1 and 0.6 ng kg-l respectively. Recoveries of methyltin and butyltin species
from spiking experiments were greater than 70 ± 10 0/0. Tributyltin was found in all
sampled sites, probably originating from tributyltin based antifouling paints.
The sorption of tributyltin on estuarine sediments under various conditjons of
alkalinity has been studied [347]. The resulting estimated equilibrium sorption coefficients were in general agreement with apparent sorption coefficients calculated from
concentrations of tributyltin in water and sediment at various sites in Chesapeake
Bay. However, very high apparent sorption coefficients were found in areas where
there was high boating activity; this could be due to the presence of tributyltin paint
chips in the sediment. Sorption and desorption coefficients were similar, indicating
that sorption of tributyltin was reversible. Desorption kinetics indicated initial rapid
desorption followed by desorption at a slower rate.
5.5
Radioelements
Stanners and Aston [348] reported on the determination of ruthenium 106, caesium 134, caesium 137, cerium 144 and americium 241 in intertidal sediments contaminated by nuclear fuel reprocessing effluents originating at Winscale, UK. Radiocaesium nucleides were desorbed from the sediment at up to 30 % of their initial
activity.
Organometallic Compounds
5.4.7
Tin
Organometallic Compounds
117
To determine methyltin, butyltin and inorganic tin in Great Bay estuary sediments,
Randall et aI. [346] extracted the freeze dried sediment with 2.5 moll- 1 calcium
chloride and 2.5 mol 1-1 hydrochloric acid and analysed by hydride generation atomic
absorption spectrometry. Detection limits for inorganic tin and tributyltin were
2.2 ng kg- 1 and 0.6 ng kg-l respectively. Recoveries of methyltin and butyltin species
from spiking experiments were greater than 70 ± 10 0/0. Tributyltin was found in all
sampled sites, probably originating from tributyltin based antifouling paints.
The sorption of tributyltin on estuarine sediments under various conditjons of
alkalinity has been studied [347]. The resulting estimated equilibrium sorption coefficients were in general agreement with apparent sorption coefficients calculated from
concentrations of tributyltin in water and sediment at various sites in Chesapeake
Bay. However, very high apparent sorption coefficients were found in areas where
there was high boating activity; this could be due to the presence of tributyltin paint
chips in the sediment. Sorption and desorption coefficients were similar, indicating
that sorption of tributyltin was reversible. Desorption kinetics indicated initial rapid
desorption followed by desorption at a slower rate.
5.5
Radioelements
Stanners and Aston [348] reported on the determination of ruthenium 106, caesium 134, caesium 137, cerium 144 and americium 241 in intertidal sediments contaminated by nuclear fuel reprocessing effluents originating at Winscale, UK. Radiocaesium nucleides were desorbed from the sediment at up to 30 % of their initial
activity.