In this article

a surface enhanced Raman spectroscopy(SERS） based on filter paper substrate was developed for the recyclable detection of chlorpyrifos in water.The substrate was prepared by loading the filter paper with Ag nanoparticles(AgNPs） and ZnO nanoparticles

which has a uniform distribution of hot spot and a good detection stability

and exhibits a high performance in the detection of chlorpyrifos

with a limit of detection(LOD） of 48.53 μg/L and a linear range of 50-500 μg/L.Stability for cycle detection of the substrate was investigated under UV irradiation

and Results showed that chlorpyrifos pesticide could be degraded with ZnO nanoparticles as photocatalyst under the circular irradiation of UV light.Meanwhile

the substrate remained a high Raman activity in each detection.The detection substrate combined with SERS was applied to the detection of chlorpyrifos in real surface water.The spiked recoveries were in the range of 111%-139% with relative standard deviations(RSDs） not more than 12%.The detection limit for chlorpyrifos residues in water based on the fabricated substrate in this paper could meet the limit requirements for groundwater quality standard towards chlorpyrifos in agricultural water and the maximum residue limit value for chlorpyrifos in fruits and vegetables in the pesticide residue limit standard towards food.With the advantages of simple operation

short time consumption and low cost

this method has a great potential in the rapid detection of pesticide residues.