การจำแนกชนิดของสารกำจัดศัตรูพืชตกค้างด้วยเนียร์อินฟราเรดสเปกโทรสโกปี
ปาริชาติ เทียนจุมพล วรินทร มณีวรรณ พิเชษฐ์ น้อยมณี และ ดนัย บุณยเกียรติ
วารสาร วิทยาศาสตร์เกษตร 42 (3 พิเศษ): 25-28. 2554.
2554
บทคัดย่อ
This research was studied on the identification of pesticide residue by non-destructive technique, NIR spectroscopy. Two commercial grade of pesticides, chlorpyrifos and cypermethrin, were used in this study. The pesticides solution at various concentrations of 0, 50, 100 and 200 ppm were prepared in acetonitrile. Each solution was dropped on the glass fiber filter paper or Dry Extract Spectroscopy by infrared Reflection (DESIR) technique. The samples were dried in a hot air oven at 35 °C for 1 hour. Then, the NIR reflectance spectrum of samples was measured by NIRSystem 6500 with the wavelength range between 400 - 2500 nm. Prior to the measurement, the calibration equation was developed by a partial least square regression (PLSR) and analyzed by principle component analysis (PCA). It was found that the PLSR calibration result of both pesticides in long wavelength (1100 – 2500 nm) was high accuracy. The correlation of determination (R2), standard error of calibration (SEC), standard error of prediction of chlorpyrifos calibration equation were 0.89,