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联合FTIR,FT-拉曼表征了乐果的振动光谱,获得了固态及不同酸碱条件下饱和液态乐果的振动特征信息;以金/银核-壳复合粒子为基底,获得了乐果在酸碱条件下一系列浓度的表面增强拉曼散射(SERS)光谱,考察了乐果分子在该基底表面的吸附状态及其酸碱影响,推测了乐果与金/银核-壳复合粒子作用机理;结果表明:νas(NH),νas(CH3),ν(O=C-N),τ(O=C-N),ν(P—O),ν(P S),ν(C—C),δ(P—O—C)为乐果分子特征振动;酸、碱条件下,在1.0×10-3mol.L-1为乐果与基底作用的最佳浓度;乐果主要以P—O—C,O=C-C,(S—CH2),P=S,CH3与金/银核-壳复合粒子基底相作用,探讨了酸碱条件下磷酸酯键不同离解历程对吸附的影响。为研究有机磷农药的形态变化提供有益参考。
Vibrational spectra of dimethoate were characterized by FTIR and FT-Raman spectroscopy. The vibrational characteristics of saturated dimethoate in solid state and different acid-base conditions were obtained. Based on the gold / silver core-shell composite particles, A series of concentrations of surface enhanced Raman scattering (SERS) spectroscopy under acid-base conditions were used to investigate the effect of dimethoate adsorption on the surface of the substrate and its acid-base effect. The results show that: νas (NH), νas (CH3), ν (O = CN), τ (O = CN), ν (P-O), ν (PS), ν (C-C) P-O-C) was the characteristic vibration of dimethoate. Optimum concentration of dimethoate and substrate was 1.0 × 10-3 mol·L-1 under acid and alkali conditions. O = CC, (S-CH2), P = S, CH3 and the gold / silver core-shell composite particles. The effect of different dissociation history of phosphate bond on the adsorption was discussed. It provides a useful reference for studying the morphological changes of organophosphorus pesticides.