Abstract:

To investigate the matrix-effect response characteristics and optimize the detection methods, an experiment was conducted on representative vegetables (heading cabbage) and fruits (peach) in Baiyin City, Gansu Province, which could eliminate or compensate for the adverse effect caused by matrix effect as much as possible. The solvent standard and matrix standard effect on pesticide residue detection (PRD) results were experimentally studied, and the optimization method of matrix standard correction was put forward. The results show that heading cabbage and peach have significant matrix effect on PRD results, and matrix effect of peach is more significant than that of heading cabbage. Peach has obvious enhancement matrix effect on omethoate, isocarbophos, profenofos and procymidone. Heading cabbage has obvious enhancement matrix effect on triazophos, but has no obvious matrix effect on chlorpyrifos and bifenthrin. The matrix effect of peach on organophosphorus pesticides is higher than organochlorine pesticides, but there is no obvious tendency for pesticide types in heading cabbage. Compared with the solvent standard, the matrix-standard correction method is more accurate, which can effectively eliminate the influence of matrix effect on the accuracy of PRD results. Moreover, the optimization method of matrix standard correction is proved to be feasible.

Key words: pesticide, pesticide residue detection, matrix effect, solvent standard, matrix standard