Precision and recovery
To assess accuracy and repeatability, the proposed method was
applied for the samples spiked at three fortification levels, 10, 100
and 500 ng g1. The intra-day precision of the method was performed
by analysing six identical samples in 1 day, and the interday
precision of the method was performed by analysing the samples
once a day over six consecutive days. The recoveries and the
RSDs of intra- and inter-day were shown in Table 2. In all three fortification
levels, the recoveries were in the range of 66–117%, and
the RSDs were less than 9.1%, ranging from 1.2% to 9.1%.