Measurement Uncertainty
Measurement Uncertainty :
Measurement uncertainty is a complicated issue, but at the core is a familiar problem. When something is measured, even with very accurate instruments, that measurement will never be exact due to limitations in either the measuring method or the measuring instrument. These limitations can be very small but they will still be present. Measurement uncertainty is therefore an indication of how accurately the measured value actually reflects the actual value of what is being measured. For pesticide residues, measurement uncertainty is important because a residue level might be measured at just over the MRL, whereas it might actually be just under the MRL. This means that we can only be certain that a residue level is over the "MRL" if it is greater than the "MRL" plus the measurement uncertainty. For most pesticide residues, the measurement uncertainty is 50% of the MRL
