The basic principles that a related organic substance can emit fluorescence as it is excited by ultraviolet rays is described

the relationships of molecular structures of organic substances and generation of fluorescence are studied

molecular structures and chemical characteristics of a few common pesticides such as carbaryl

carbofuran

carbisoprocarb and acetamiprid are analyzed and their mechanism of generation of fluorescence is revealed. Moreover

the fluorescence spectrum experiments are conducted by means of a steady-state fluorescent spectrograph with the solutions of carbaryl

carbofuran and acetamiprid using pure methanol

the mixture of 80% of water and 20% of methanol and the alkalescent mixtures (pH=13) as solvents respectively and that their fluorescence spectrograms have been obtained and the relationships of their own molecular structures and characteristics of fluorescence are analyzed. The results indicate that some pesticides

for example carbaryl

carbofuran and acetamiprid

who have groups with plane rigidity structures or conjugate system like aryl ring and heterocyclic ring

can emit fluorescence as they are excited in a certain solvent or under the condition of acid or alkalescence

and they can be analyzed and measured directly or indirectly by fluorescence analysis. Study on fluorescence characteristics of pesticides provides a feasible theoretic basis for further researching and developing a fluorescence spectrometer for pesticides.