Abstract:

A method for the simultaneous determination of cadmium, lead and copper in milk was established using Hg-plated
anodic stripping voltammetry. Under optimized test conditions, the peak potentials of cadmium, lead and copper were -0.70,
-0.52 and -0.08 V, respectively. The linear domain ranges were 0.1–40, 1–80 and 0.5–100 μg/L, respectively, and the limits of
detection were 0.06, 0.3 and 0.1 μg/L, respectively. The spiked recoveries of cadmium, lead and copper were 99.57%, 101.3%
and 98.00%, respectively, with RSDs (n = 5) of 4.0%, 2.9% and 2.7%, respectively. There was no significant difference
(P ＞ 0.05) between the results from simultaneous anodic stripping voltammetry and atomic absorption spectroscopy (AAS).
This voltammetric method has the advantages of rapidity, simplicity and accuracy, and can be used for the simultaneous
determination of cadmium, lead and copper in milk.

Key words: anodic stripping voltammetry, milk, cadmium, lead, copper