Tributyltin and triphenyltin uptake by lettuce

Area of Science:

• Environmental Chemistry
• Soil Science
• Plant Physiology

Background:

• Organotin compounds like TBT and TPhT are environmental contaminants.
• Understanding their fate in soil-plant systems is crucial for food safety.

Purpose of the Study:

• To quantify the transfer of TBT and TPhT from sludged soil to cultivated lettuce.
• To evaluate the influence of soil concentration, sludge amount, cultivation duration, and temperature on organotin uptake and fate.

Main Methods:

• Experimental designs were used to assess organotin transfer under varying conditions.
• Lettuce was cultivated in sludged soil with controlled initial organotin concentrations, sludge amounts, and durations.
• The impact of cultivation temperatures (13°C and 19°C) was investigated.

Main Results:

• TBT concentration in lettuce roots correlated with initial soil concentration; TBT was continually taken up.
• TPhT showed significant degradation in soil, suggesting early plant uptake.
• Organotin uptake was higher at 19°C than 13°C, with accumulation primarily in roots.
• TBT and TPhT translocation to shoots was limited (up to 10% and 2%, respectively).

Conclusions:

• TBT and TPhT exhibit different behaviors in soil-plant systems, with TBT persistence and TPhT degradation.
• Temperature significantly affects organotin uptake by lettuce.
• Root accumulation is the primary route for organotin uptake, with minimal shoot translocation.