Amperometrische Bestimmung von Pflanzenschutzmitteln in technischen Wirkstoffen und Formulierungen

A process was developed which made possible the determination of smallest quantities of nickel(II) using the above method and an electrolyte consisting of 0.1 M KNO₃ and 0.02 M KSCN. In the concentration range of 5×l0^?6 to 5×10^?8 M nickel(II) an excellent linear relationship between the anodic dissolution currents of nickel enriched on the mercury drop and the nickel(II) concentration in the solution was established, under the condition, however, that the nickel concentration in the mercury is not too high; otherwise the method is no longer reproducible.