The Accumulation of Cadmium in Soils and Selected Vegetables Cultivated in the Allotment Gardens of Rzeszów
2012
Właśniewski, Stanisław | Hajduk, Edmund
The research presents the results of determining the cadmium content in soils and vegetables (carrot and celery roots and leaves) from allotment gardens in Rzeszów. Beside basic physico-chemical soil properties, cadmium content (AAS technique) in perchloric acid and the extract of 1 mol HCl·dm⁻³ were also determined in material collected from 11 groups of allotment gardens. The content of Cd in vegetables was determined in soluble H₂SO₄, HNO₃, and H₂SO₄. The content of cadmium in soil was variable (0.21-0.99 mg·kg⁻¹) and its average concentration reached 0.42 mg·kg⁻¹. Total Cd content was statistically correlated with soil particle size fractions (< 0.02 mm). As much as 95% of the soils exhibited a natural content (0°) of Cd and 5% of the soils showed increased levels of cadmium (I°). The soils and vegetables from allotment gardens located near busy roads were more polluted by cadmium. The excess of the critical contents of cadmium (0.15 mg·kg⁻¹) in carrot and celery disqualifies these vegetables for consumption.
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