Determination of cadmium, lead and copper in milk and milk powder by means of flow potentiometric stripping analysis.

摘要: Abstract A flow potentiometric stripping analysis procedure for the determination of cadmium, lead and copper in milk powder samples is described. The instrumental arrangement consists a glassy-carbon thin-layer cell through which six different solutions may be drawn by means peristaltic pump magnetically operated valves. electrode pre-coated with film mercury can employed several analytical runs. sample, diluted five-fold Suprapur hydrochloric acid, electrolysed 0.5–4 min prior to acid. Pump-rate, electrolysis time potential, opening closing inlet valves digital evaluation times are controlled automatically computer. results agree satisfactorily certified values three reference samples. detection limit after 4, 1 0.5 pre-electrolysis 0.8, 4 8 μg l. , respectively. An containing high concentrations tin