The cadmium concentration in both wine samples was low and, under the used conditions, the Cd concentration
in the solution was 0.03 ng/mL which is the level observed in natural water samples.
This low Cd concentration and the consequent variation of the analytical signal are the reasons for the very high RSD. If better quality of analytical data for cadmium is necessary, these results indicate that this element must be analyzed separately using alternative conditions.
For lead and copper an acceptable repeatability of the analytical data was obtained with the conditions used in Table 1.
Only for copper were some differences in the concentration between red and white
wine observed.
With great probabilty the source of these differences is blue fining which is used more for white wine (Cu contamination) than for red one.