Mirela MICLEAN¹, Erika LEVEI¹, Oana CADAR¹, Marin ȘENILĂ¹ & Ioan Ștefan GROZA^2
1INCDO-INOE 2000, Research Institute for Analytical Instrumentation, 67 Donath, 400293, Cluj-Napoca, Romania, email: mirela.miclean@icia.ro
²University of Agricultural Sciences and Veterinary Medicine, Faculty of Veterinary Medicine, 3-5 Manastur, 400372, Cluj-Napoca, Romania

COMPARISON OF TWO EMPIRICAL MODELS FOR SOIL TO RYEGRASS TRANSFER OF METALS IN BAIA MARE MINING AREA

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The concentrations of Pb, Cu, Cd and Zn were assessed in ryegrass (Lolium perenne) and adjacent soil, collected in urban area of Baia Mare, Northwestern Romania. Aqua regia and DTPA (diethylenetriaminepentaacetic acid) metal extractable fractions were investigated in order to evaluate the mobility of metals in soil. Linear (based on transfer factors) and nonlinear (based on Freundlich's equation) regression models were used to describe the transfer of Pb, Cu, Zn, Cd from soil to ryegrass. The obtained results showed that the soil of Baia Mare is highly polluted with heavy metals, the majority of the total concentrations of all the investigated metals exceeded the alert levels for sensitive soils, according to Romanian legislation. The mean values for transfer factors were: 0.049, 0.027, 0.453 and 0.034 for Pb, Cu, Cd and Zn, respectively.The results showed that Freundlich-type function was more suitable than linear regression to predict Pb, Cu and Zn concentrations in ryegrass from the DTPA-extractable metal concentrations.

metals, soil, Lolium perenne, transfer factor, Freundlich's equation