Variations of cadmium content in plants after sewage sludge application
1998
Balik, J. | Tlustos, P. | Szakova, J. | Pavlikova, D. | Balikova, M. | Blahnik, R.
The effect of sewage sludge on cadmium (Cd) content in plants was examined in vegetation pot trials. Two types of sludge with average Cd content were used. Experiments were conducted in three soils (Chernozem, Orthic Luvisol, Fluvisol) and on four crops (poppy, barley, corn, oats). Direct and subsequent effects of sewage sludge were studied. A trend of elevated Cd content in plants was observed at the dose used (16.65 g dry matter/5 kg soil). The highest contents were determined in barley straw and poppy seed, the lowest in barley grain. Cd content in the soil was also determined after the use of various extraction agents (2M HNO3, 0.1M CaCl2, 0.01M CaCl2). An average Cd proportion in 2M HNO3 was 60.2 % out of Cdtot in soils. When 0.1M CaCl2 was used, 3.9 to 19.9 % of the total Cd quantity in soils were released in dependence on the soil. 0.01M CaCl2 extracted less than 1 % of Cdtot. The closest relation between Cd content in plants and extractable Cd quantity from soil was determined for 0.1M CaCl2 extraction.
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