3.1 Definition of residues of fat-soluble compounds
The Meeting has for many years included the qualification 'fat-soluble' in the definition of the residues of fat-soluble pesticides, using the expression
'Definition of the residue: [pesticide] (fat-soluble)'
Although previous Meetings recognized that fat-solubility is a property of the residue and not a part of its definition in chemical terms, the practice of treating it as part of the definition had been continued because expression in this way was succinct and because fat-solubility has implications for sampling and analysis, especially of meat and dairy products. As different definitions of residues may be needed for estimating dietary intake and for assessing compliance with MRLs however, the Meeting agreed that 'fat-soluble' should no longer be included in the definition of the residue. In order to avoid confusion while conveying the information that a residue is fat-soluble, the Meeting agreed that the definition of a residue should include only the chemical species of concern and a separate sentence should indicate that the residue is fat-soluble.
Example:
Definition of the residue for compliance with MRLs and for estimation of dietary intake: diazinon.The residue is fat-soluble.
If the definition of a residue for compliance with MRLs differs from its definition for the estimation of dietary intake, both definitions will be given.
