Saratov National Research State University named after N. G. Chernyshevsky has developed a mobile method for detecting residues of imidazolinone herbicides in soil. The technology makes it possible to carry out the analysis not only in a laboratory, but also directly in the field. The method requires a laboratory well plate, an ultraviolet lamp and a smartphone with a camera.
The method is based on special proteins that recognize herbicide molecules and quantum dots — nanoparticles that glow green under ultraviolet light. The higher the level of the contaminant, the weaker the glow becomes. The color intensity can be assessed with a smartphone camera, providing an approximate quantitative estimate of the substance concentration.
According to the researchers, imidazolinone residues can remain in soil for 20 to 500 days. They can negatively affect microorganisms, cultivated plants and crop yields, especially during drought, waterlogging or changes in soil acidity. Crops grown after sunflower are among the most sensitive to such residues.
The technology is expected to be a convenient tool for farmers, agronomists and environmental laboratories. The ability to quickly check soil conditions directly before sowing will make it possible to assess risks in time, avoid crop losses and make more precise decisions when planning agricultural work.
