title: Nature of the field-to-field distribution of pesticide residues.
abstract: The supervised trial datasets (1950), consisting of a minimum of five residue values and selected by the experts of FAO/WHO Joint Meeting on Pesticide Residues for recommending maximum residue levels between 1997 and 2011, were evaluated to obtain information on the typical spread of residue values in individual datasets. The typical relative standard deviation, CV, of field-to-field variation of pesticide residues was about 80%. The spread of residues in datasets is independent from the chemical structure of pesticides, residue level, pre-harvest interval and number of values in the datasets. The CV ranges within the Codex commodity groups and between groups overlapped and their difference were not statistically significant. The number of residues below the limit of quantification (LOQ) affects the CV at various extents depending on the ratio of LOQ/R mean. The combined uncertainty of the highest residue in a dataset significantly affects the CV of the dataset. The lowest and intermediate ones have less influence. The residues in different fields receiving the same treatment vary within large range: 55%, 72%, 78%, 86% and 89% of the 25,766 residues values were, respectively, within 3, 4, 5, 6 and 7 times the median value of the corresponding dataset.
authors: a National Food Chain Safety Office of Hungary , Directorate for Food Safety Risk Assessment , Budapest , Hungary.
authors: Arpád
authors: A
authors: Ámbrus
authors: Zsuzsanna
authors: Z
authors: Horváth
authors: Zsuzsa
authors: Z
authors: Farkas
authors: István J
authors: IJ
authors: Szabó
authors: Enikő
authors: E
authors: Dorogházi
authors: Mária
authors: M
authors: Szeitzné-Szabó
mesh_terms: D000704:Analysis of Variance; D016208:Databases, Factual / Q000706:statistics & numerical data; D005506:Food Contamination / Q000032:analysis / Q000706:statistics & numerical data; D057230:Limit of Detection; D010573:Pesticide Residues / Q000032:analysis*; D012044:Regression Analysis
chemical_list: D010573:Pesticide Residues