Abstract
The simultaneous determination of tin(II) and lead(II) as well as of indium(III) and cadmium(II) by second-harmonic a.c. voltanunetry using a semi-stationary mercury electrode with a drop-time of 240–300 sec (the long-lasting sessile-drop mercury electrode) has been investigated. Under the best experimental conditions, concentration ratios in the ranges l:12 ⩽ c Sn: c Pb ⩽ 15:1 and 1:15 ⩽ c In: c Cd ⩽ 15:1 can be determined.
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