Sample volume
The second possibility to enhance the analytical signal is to increase the volume of wine used in the determination.
Figure 3 presents the correlation between peak area and wine volume at constant deposition time for the three elements studied.
As the cadmium concentration in many wine samples was very low (around 0.2 ng/mL), it was
necessary to use a minimum volume of 3 mL to generate an acceptable analytical signal. With this volume, the copper signal was often 200 times higher than the cadmium