At fortification levels of 0.05, 0.1, 0.25,0.5, 1.0 and 5.0 mg kg1, it was shown recovery was 99.4% (95.3–103.5%) for potato tubers, and 88.5% (86–91%) for soil with coefficient variation of the method (CV%) was less than 4% in potato tubers, and
in soil less than 11%. For repeatability ranged from 1.27% to 4.77%. The LOD and LOQ were estimated to be 0.02 and 0.06 mg kg1, respectively.