title: Multiresidue analysis and monitoring of pesticides in rice by pressurized liquid extraction.
abstract: The aim of this study was to assess the performance of a method of analyzing pesticides in rice by using pressurized liquid extraction (PLE) and to perform a preliminary monitoring by using that method. The instrumental quantification limit, instrumental detection limit, method quantification limit, and method detection limit were determined. PLE temperature was also optimized for 6 target pesticides. Mean recoveries of spiked rice with target pesticides (4 ng/g and 40 ng/g) were 83%-109% with the repeatability of the analysis, represented as relative standard deviations, ranged from 1.3% to 11% (n = 5) for PLE at 130 degrees C. These results were satisfactory according to the method of positive list in Japan. In a preliminary analysis of 10 target pesticides in 54 commercial rice samples, ferimzone was detected in only one unpolished rice sample.
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), National Metrology Institute of Japan (NMIJ), Ibaraki 305-8563, Japan. t-ootake@aist.go.jp
authors.forename: Takamitsu
authors.initials: T
authors.lastname: Otake
authors.forename: Yoshie
authors.initials: Y
authors.lastname: Aoyagi
authors.forename: Takashi
authors.initials: T
authors.lastname: Yarita
mesh_terms: D002138:Calibration; D019411:Clinical Laboratory Techniques; D008401:Gas Chromatography-Mass Spectrometry / Q000592:standards*; D007564:Japan; D012275:Oryza / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012995:Solubility; D013696:Temperature
chemical_list: D010573:Pesticide Residues