Determine the concentration of zinc (mg/cm3) in the test solution, if during amperometric titration of 10 cm3 of the solution with a freshly prepared K4[Fe(CN)6] solution with a zinc titer of 0.00244 at Е=-1.46 V, the following results were obtained:

V, cm3 0 0.2 0.4 0.5 1.0 1.5 2.0
I(dE) 30 31 30 32 80 200 310
uA

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