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.
1
Soil-grown peas absorbed very little tolfenpyrad (bioconcentration factor below 1), while hydroponic peas absorbed it readily (bioconcentration factor much greater than 1).
2
Tolfenpyrad broke down quickly inside pea seedlings, with a half-life of 3.6–3.8 days regardless of growing method.
3
Risk quotients remained below 100% in all conditions, indicating negligible dietary exposure risk from tolfenpyrad residues in peas.
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