For all investigated elements the linear correlation coefficient
was better than 0.999 and the limits of detection and quantification
were appropriate to determine the elemental composition of
the wine samples. Recovery tests for spiked samples were also
carried out by adding appropriate aliquots of 1000 or
10,000 mg L−1 single-element stock standard solution to wine
samples in order to obtain spikes of 1.0 mg L−1 of Co, Cu, Mn, Rb
and Sr, 0.10 mg L−1 Be and Li, 20 mg L−1 of Ca and Na, and
100 mg L−1 of K. Recoveries of analytes added to wine samples
varied between 91% and 111%, which might be considered appropriate
for the purpose of this work. The recoveries found for the
four key elements in three wine samples are shown in Table 5.
As there is no certified reference material available for wine, a
sample was evaluated, which was produced in France with
C. sauvignon grapes in 2011 and analyzed in an interlaboratorial
comparison [23]. Some of the most significant wine properties,
including organic and inorganic compounds were evaluated by a
number of European laboratories, and the final results were
presented as the mean and the standard deviations. The results