Limit of Quantification (LOQ) 2
Limit of Quantification (LOQ) 2 : (a) The smallest amount of the pesticide that can be quantified by the analytical method. [OECD, 1997: Occupational Exposure to Pesticides]; (b) LOQ is the point at which "measurements become quantitatively meaningful" (Taylor, 1987). It is the lowest pesticide residue that can be accurately quantitated in a reproducible fashion. The LOQ can be defined in a number of ways, such as the background response plus ten times the standard deviation of the lowest measurable concentration, ten times the signalto- noise ratio of the baseline noise, ten times the standard deviation of the lowest measurable concentration, etc. In practice, the LOQ is the lowest fortification level that shows adequate recovery during the method validation process. [USEPA, 1998: Postapp. Exposure Test GL.]
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