PL
Zawartość metali ciężkich w glebach większości badanych krakowskich ogrodów działkowych przekracza górne zawartości przyjmowane dla gleb nie zanieczyszczonych, a niektóre z nich klasyfikowane są w grupie gleb o dużym i niebezpiecznym stopniu zanieczyszczenia. Dotyczy to zwłaszcza cynku i kadmu oraz w mniejszym stopniu ołowiu. Oznaczona ilość metali ciężkich w badanych warzywach przekracza dopuszczalną zawartość kadmu we wszystkich próbkach sałaty i rzodkiewki oraz ołowiu i cynku we wszystkich próbkach sałaty. Jedynie zawartość miedzi i niklu w obu warzywach mieści się w dopuszczalnych granicach.
EN
The aim of the investigations was to determine the accumulation of heavy metals (Cd, Cu, Ni, Pb and Zn> in soils and vegetables from allotment gardens in Krakow, and to compare the data with the metals contents in analogous materials from the gardens located in other areas. Samples of soil and vegetables wen; collected in the middle of June 1993 in 15 gardens in Kraków, the materials for comparison were obtained from the areas strongly or slightly polluted with heavy metals (Fig. 1). Samples of soil were collected (mm 0-20 cm and 20-40 cm layers, respectively, vegetable samples from lettuce and radish in their consumptive maturity The contents of Cd, Cu, Ni, Pb and Zn in the soil and plants were determined following the decomposition in the mixture of nitric and perchloric acids. Apart from the heavy metals contents also physico-chemical properties of the soil samples were determined (Tab. 1). The determined contents of heavy metals in the soils from garden plots in Kraków fall within relatively wide limits and most often exceed the top values assumed Tor non-polluted soils (Tab. 2). In some gardens the contents may be estimated dangerous for the growth and development of plants, and for their consumers. This fact concerns particulary zinc and cadmium, and to a lesser degree, lead (Tab. 3). Most of the investigated soils were characterized by a big amount of organic matter and neutral or alkaline reaction (Tab. 1). It may be assumed that it limits the heavy metals uptake from soil by the vegetables grown in these'gardens. The permissible contents of cadmium, lead and zinc in lettuce, and cadmium in radish were exceeded in all analyzed samples, including those from the areas considered free from industrial pollution (Tab. 5), Radish from all garden plots in Krakow accumulated excessive amounts of lead, and from most (11 gardens) also zinc. Only the contents or copper and nickel were within the norm.