Raman and surface-enhanced Raman study of insecticide cyromazine

Surface-enhanced Raman scattering (SERS) spectroscopy is applied to the study of the adsorption of the insecticide cyromazine on Ag colloid. The influence of pH and the aggregation inductors, sodium chloride, potassium nitrate and sodium hydroxide on the adsorption mechanism was investigated. Two different adsorption mechanisms are deduced depending on the experimental conditions: via the N atom bounded to the cyclopropyl (cP) group or through an ionic pairing of protonated amino groups with the chloride adsorbed on the metal. An important contribution of the chemical mechanism was inferred when the interaction with the metal occurs through the N lone pair (C) 2001 Elsevier Science B.V. All rights reserved.