Changes of Vitamin C Content in Relation to the Range of Accumulation of Cd, Pb and Zn in Potato Tubers

The changes of vitamin C content in relation to Cd, Pb and Zn accumulation in 6 potatoes varieties: very early (junior, Impala), early (Livera), middle early (Agria), medium-late (Asterix, Desiree) were surveyed in this work. The soil used in pot trial had pseudototal (in soil extract of aqua regia) contents of Cd 0.54-0.9, Pb 14.0-107.2, Zn 47.9-55.8 mg/kg. Experiment was conducted in 4 variants: A - control, B-D with the gradual treatment of Cd, Pb, and Zn in form on their salts solutions. The metals content in potatoes was assessed by AAS, vitamin C by HPLC method. The accumulation Cd, Pb, Zn varied in dependence on variety, the highest one was in varieties Junior, Impala; the lowest one in Asterix, Desiree. The vitamin C content (mg/kg f.m.) was highest after Cd treatment in all varieties in variant D: 491.46 (Junior) - 566.27 (Asterix); after Pb in variant B: Impala (101.51) - Desiree (157.31), after Zn in variant C: Impala (78.80) - Desiree (143.41).