respectively.
However, it needs to be stressed that for the latter parameter the
smallest value of bias for 5% concentration (b ¼ 0.33) was found.
Fig. 5 also presents a graph for the values of the recovery (R)
depending on the concentration of PO in BF sample. It may be
observed that the R values closest to 100% were recorded for
parameter h1/h3, which is confirmed by the mean value, amounting
to 101% (Table 4). When considering different concentrations, it
was also observed that the greatest deviations from 100% were