3.12. Analytical features of the method
Under the optimized experimental conditions, the analytical
parameters were investigated. The calibration graph was linear in
the range of 5–600 ng mL1 of carbendazim with a correlation
coefficient (r) of 0.9996. The limit of detection (LOD) calculated
based on 3 Sb was 1.2 ng mL1 and limit of quantification (LOQ)
based on 10 Sb was 4.0 ng mL1
. The preconcentration factor,
defined as the volume ratio of the aqueous sample solution
(10 mL) and sedimented phase (0.18 mL), was 55.5. The intra-day
and inter day precision calculated as the relative standard deviations
(RSD) for eight replicate determinations of 50 ng mL1 of
carbendazim were 3.9% and 4.1%, respectively