在pH =10.0的Britton-Robinson (BR)缓冲溶液中,多菌灵与Pd(Ⅱ)反应形成1:1的六元螯合物,导致共振瑞利散射(RRS)、二级散射(SOS)和倍频散射(FDS)显著增强,并产生新的共振瑞利散射光谱,其最大RRS、SOS和FDS波长分别位于309、606和310 nm.在一定范围内,3种散射增强(△IRRS、△ISOS和△IFDS)均与多菌灵的浓度成正比,反应具有较高的灵敏度,对于多菌灵的检出限分别为7.1×10-9 g/mL(RRS)、7.4 xl0-9g/mL(SOS)和10.7×10-9g/mL(FDS).据此提出了测定多菌灵的光散射新方法.以灵敏度最高的RRS法为例,测定了西芹和市售农药中多菌灵的含量,结果与标准方法一致.文中还对反应机理和散射增强的原因进行了讨论.
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