Effect of copper and cultivation condition on the transport, metabolism, and potential risk of tolfenpyrad in pea seedlings (<i>Pisum sativum</i> Linn.).
Xiong W, Tang Q, Xia Y, Du S, Shi J, Zhang K.
Pesticide Residues
If you grow peas in containers or hydroponic setups, the growing medium matters far more than you might think — a pesticide that barely enters a garden-bed pea can flood straight into a water-grown one.
Scientists grew pea seedlings in soil and in water to see how much of a common insecticide called tolfenpyrad ended up inside the plants. They found that soil acts like a sponge that holds the pesticide away from roots, while water-grown peas soaked it up readily. The good news is that the chemical broke down on its own within about a week, and the amount left in the plants was too small to pose a meaningful health risk.
Key Findings
Soil-grown peas absorbed very little tolfenpyrad (bioconcentration factor below 1), while hydroponic peas absorbed it readily (bioconcentration factor much greater than 1).
Tolfenpyrad broke down quickly inside pea seedlings, with a half-life of 3.6–3.8 days regardless of growing method.
Risk quotients remained below 100% in all conditions, indicating negligible dietary exposure risk from tolfenpyrad residues in peas.
chevron_right Technical Summary
Researchers tested how copper contamination and growing conditions (soil vs. hydroponics) affect how much of the insecticide tolfenpyrad pea plants absorb and retain. Soil-grown peas absorbed very little, hydroponic peas absorbed much more, but the pesticide broke down quickly in both cases and posed negligible dietary risk.
Abstract Preview
Pesticides and heavy metals are two major classes of environmental pollutants, and their environmental fate requires careful assessment. This study investigated the effects of copper (Cu) and culti...
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