For solid matrices spiking levels for each colorant of groups A and
C ranged from 10 to 300 mg kg1 while fortification levels for group
B dyes ranged from 5 to 100 mg kg1. RSDr and RSDR were assessed
by processing results coming from 3 spiking levels (50, 100 and
200 mg kg1). Concentrations, standard deviation, repeatability and
intermediate repeatability as percentage variation coefficient (CV%)
were calculated for each spiking levels mentioned before.