Field-grown bok choy treated with the insecticide dimethoate was sprayed with a cerium-doped nano titanium dioxide hydrosol to speed photocatalytic breakdown of the residue. The treatment raised reactive oxygen species in the leaves and accelerated dimethoate degradation; cerium residues on the vegetable were not measured.
Key numbers
- Cerium doping of the titanium dioxide was 0.6% in molar ratio (Materials, p. 3).
- No cerium measurements in bok choy are reported.
Methods (brief)
Field plots with dimethoate application followed by hydrosol spray; residues and breakdown products measured by UPLC-MS.
Evidence fitness
Shows a route by which a cerium-containing material can be sprayed directly onto a leafy vegetable. Because cerium on or in the leaves was not measured, it cannot support any residue or exposure statement.
Limitations
No cerium analysis; one crop and location.
Related evidence
Update history
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