Characterization of pesticide residual dynamics by in situ attenuated total reflection FTIR

In-situ attenuated total reflection FTIR(in situ ATR-FTIR) was used for the dynamic research on the residual of pesticide.The in-situ characterization of dichlorvos and orthene on the tomatoes' surface shows that the dichlorvos has obvious volatility and its degradation amount is 80% 20 minutes after spraying.Meanwhile,the ATR-FTIR shows that the strong absorption peak of dichlorvos at 1 734 cm-1 turns to negative peaks and the absorption peaks at 3 073 cm-1 significantly abate.The absorption peaks at 1 277 cm-1 become weak and red shift(30 cm-1) shows that the dichlorvos may be hydrolyzed to some extent.While the absorption peaks of orthene show no change 120 minute after spraying.It shows that the orthene is relatively stable.