English Abstract Accumulation in soil and leaching to groundwater of
residues of the gungicide fentin acetate was studied in laboratory soil
columns. From two Dutch soil types the upper 1.10 m below soil surface was
placed in stainless steel columns. The columns were treated with fentin
acetate and leached during one year. An artificial water table was
maintained at 1 metre depth. Separately batch sorption and transformation
experiments were performed. Soils and soil leachates were analysed for
tri-, di- and mono-phynyl-tin compounds. Very high sorption constants were
found for fentin acetate or its first transformation product fentin
hydroxide. The fungicide is, therefore, practically immobile in both soils.
Above mentioned transformation products were found in both the
transformation and the soil column experiments. Half-life values for the
combined phenyl-tin residues were found to be 59 to 140 days depending on
the soil type. A small fraction of the dose was found in the leachate.
Thisd unexpected result could not be explained. At the end of the column
experiment all phenyl-tin residues were found in the upper 10 cm of the
columns.
