Conclusions
Potentiometric stripping analysis can be use for the simple, rapid and inexpensive determination of Cd, Pb, and
Cu in wine. In German wine samples collected from 1993/94 vintages, the cadmium values ranged from 0.003
726
Table 2 Quality assurance for Cd, Pb and Cu determination in wine by PSA
Sample Cadmium (ng/mL) Lead (ng/mL) Copper (ng/mL)
No.
PSA ASV PSA ASV ET-AAS PSA ASV
A (white) 0.45 ± 0.12 0.52 ± 0.06 175 ± 6 164 ± 6 166 ± 5 380 ± 41 366 ± 19
B (red) – – 45.9 ± 3.2 44.0 ± 6.7 42.4 ± 2.5 – –
C (white) – – 134 ± 8 135 ± 6 137 ± 3 – –
D (red) 1.25 ± 0.14 1.30 ± 0.08 260 ± 11 254 ± 7 258 ± 2 575 ± 32 558 ± 25
E (white) – – 70.5 ± 3.0 70.5 ± 3.0 76.2 ± 2.5 – –
F (red) 0.20 ± 0.08 0.26 ± 0.06 45.9 ± 1.3 49.8 ± 2.9 – 136 ± 7 144 ± 6
G (white) 0.20 ± 0.06 0.20 ± 0.02 55.5 ± 3.0 55.3 ± 4.4 – 256 ± 8 251 ± 17
Fig. 6 Concentration distribution in German wine samlpes collected
in 1993/94
to 0.98 ng/mL with the mean value of 0.63 ng/mL. In the
some samples, the lead values were found between 4 and
254 ng/mL with a mean value of 50 ng/mL. The copper
concentration varied from 0.05 to 3.94 g/mL with a
mean value of 0.25 g/mL.