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Berar Sur I.M.,Technical University of Cluj Napoca | Micle V.,Technical University of Cluj Napoca | Avram S.,Technical University of Cluj Napoca | Marin S.,INCDO INOE Research Institute for Analytical Instrumentation | Oros V.,Technical University of Cluj Napoca
Environmental Engineering and Management Journal | Year: 2012

In this paper are presented preliminary studies regarding the utilization of microorganisms for the decontamination of soils polluted with heavy metals. The concentration of heavy metals was determined by inductive coupled plasma atomic emission spectroscopy (ICP-AES). It has been confirmed that the studied area is polluted with Zn, Pb, Cr, Fe, Cu, Cd, Mn, the concentrations exceeding in most cases the alert threshold and the intervention threshold. The experiments led to the conclusion that this area needs reclaiming which can be done by bioleaching. This is a biologic treatment method, which uses microorganisms to encourage the solubility and the extraction of heavy metals from polluted soils. Source


Senila M.,INCDO INOE Research Institute for Analytical Instrumentation | Levei E.,INCDO INOE Research Institute for Analytical Instrumentation | Senila L.,INCDO INOE Research Institute for Analytical Instrumentation | Cadar O.,INCDO INOE Research Institute for Analytical Instrumentation | And 2 more authors.
Studia Universitatis Babes-Bolyai Chemia | Year: 2011

The aim of this study was to evaluate and compare the analytical parameters of two methods used for mercury determination from solid samples (soils and vegetables): direct determination from solid samples by thermal decomposition - atomic absorption spectrometry (TD-AAS) with gold amalgamation and determination using wet digestion followed by measurements by cold vapor atomic fluorescence spectrometry (CV-AFS). Two commercially available mercury (Hg) analyzers were used for the study. Using direct measurement in solid sample by TD-AAS, a detection limit of 1.2 μg kg-1 and a RSD of 3.8% for 1441 μg kg-1 Hg were obtained, while by using wet digestion and CV-AFS measurement, a detection limit of 2.5 μg kg-1 and a RSD of 4.5% for 1438 μg kg-1 Hg were calculated. The accuracy of the methods was verified by the determination of mercury in certified reference materials and good agreement between found concentrations and certified values was obtained for the both methods. Five real soil samples and five vegetable samples from Baia Mare area were analyzed. The Hg concentrations in soils ranged between 653-2004 μg kg-1 using TD-AAS method and between 644-1998 μg kg-1 using CV-AFS method, while in vegetables the concentrations ranged between 4,60-53,4 μg kg-1 using TD-AAS method and between 4,32-55,8 μg kg-1 using CV-AFS method. According to the t- Test and regression analysis, no significant statistical difference between the datasets obtained by the two methods was found. Source

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