A Measurement Method on Pesticide Residues of Apple Surface Based on Laser-Induced Breakdown Spectroscopy

Pesticide residues on fruit surfaces do great harm, but it is difficult to realize the fast and on-site measurement of pesticide residues. In this paper, we explored the potential application of laser-induced breakdown spectroscopy (LIBS) technology for the fast measurement of chlorpyrifos residues on apple surfaces. The spectral characteristics of phosphorus (213.62 and 214.91 nm), sulfur (393.33 and 396.89 nm), and chlorine (837.594 nm) in chlorpyrifos could be captured by LIBS. Significant spectra differences were found between untreated apples and apples sprayed with chlorpyrifos. The results of chemometrics methods indicate that the spectra of clean apples and the apples sprayed with several different concentrations of chlorpyrifos have obvious differences. The study demonstrates that laser-induced breakdown spectroscopy, which has advantages in micro-destructive, fast, and on-site test, not only can detect chlorpyrifos on fruit surfaces but also allows the semi-quantitative detection.

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