showed no significant difference at a 95% confidence
level when Student’s t-test was applied. The repeatability
(six times within a day, n = 6) was assessed for the results obtained
by analysis of different replicates of CRMs (Table 1). The RSD (%)
values were: 4.9% for TORT-2 and 1.2% for DOLT-4. The detection
(LOD) and quantification limits (LOQ) were calculated as three
times the standard deviation (3r) and ten times the standard
deviation signal (10r) of ten digestion blanks, respectively
(Llorente-Mirandes et al., 2014). The results obtained were as
follows: 0.006 mg As kg1 dry weight basis for method detection
limit and 0.021 mg As kg1 dry weight basis for method quantification
limit.