Abstract
The influences of Residual Pesticides for human health or environment have been a very important problem. Therefore, a method to measure the quantity of the residual pesticides in the agricultural products rapidly before shipping them off, is expected to be developed.
We developed a new non-destructive method to measure them by FT-IR of attenuated total reflection method (FT-IR-ATR).
In this study, we have applied FT-IR-ATR to the lettuces, that were practically produced in the fields.
The relationship was studied between FT-IR-ATR method values, which were caliculated by the multiterm linear calibration and Gaschromatography method values.
The canonical discriminant analysis and the quadratic discriminant analysis of the ATR spectra were studied as well.
The main results of this study are as follows.
(1) A group of samples of which pesticide residues were not detected (N. D. Group) could be adequately discriminated by a canonical analysis of ATR spectra.
(2) A group of samples that contained pesticide residues (Detected Group) could be adequately discriminated into two groups with a boader value of residual standard value by the quadratic discriminant function.
(3) Estimated residual values obtained by the multiterm linear calibration had too much error in such a finite range as 0 to 2ppm, where almost all the residual standards are regulated.
(4) A food safety inspection system could be proposed by applying the discriminant analysis of ATR spectra.
