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, 2013, 9-14. AHMAD, S.A., SHUKOR, M.Y., SHAMAAN, N.A., MAC CORMACK, W.P., SYED, M.A.: Molybdate reduction to molybdenum blue by an Antarctic bacterium. BioMed Res. Int., 2013, 2013a, 10 p. AHMAD, W.A., WAN AHMAD, W.H., KARIM, N.A., SANTHANA RAJ, A.S., ZAKARIA, Z.A.: Cr(VI) reduction in naturally rich growth medium and sugarcane bagasse by Acinetobacter haemolyticus . Int. Biodeterior. Biodegrad., 85, 2013b, 571-576. AMBILY, P.S., JISHA, M.S.: Biodegradation of anionic surfactant, sodium dodecyl sulphate by Pseudomonas aeruginosa MTCC 10311. J. Environ. Biol., 33

molybdenum blue method. Talanta, 61, 267-276. DOI: 10.1016/S0039-9140(03)00274-1. Magalhaes, M.C.F., & Silva, M.C.M. (2003). Stability of lead arsenates. Monatshefte für Chemie, 134, 735-743. DOI 10.1007/s00706-002-0581-9. Manecki, M., & Maurice, P.A. (2008). Siderophore promoted dissolution of pyromorphite. Soil Science, 173, 821-830. Marini, L., & Accornero, M. (2007). Prediction of the thermodynamic properties of metal-arsenate and metalarsenite aqueous complexes to high temperatures and pressures and some geological consequences. Environmental Geology, 52, 1343

: Essential oils in poultry nutrition: Main effects and modes of action. Animal Feed Science and Technology Biochem., 158, 1-14. 4. Broderick, G. A., 1987: Determination of protein degradation rates using a rumen in vitro system containing inhibitors of microbial nitrogen metabolism. Br. J. Nutr., 58, 463-475. 5. Carvalho, L. H. M., De Koe, T., Tavares, P. B., 1998: An improved molybdenum blue method for simultaneous determination of inorganic phosphate and arsenate. Ecotoxicology and Environmental Restoration, 1, 13-19. 6. Cunniff, P. (Ed.), 1995: Official Methods of

phosphomolybdate and its reduction to molybdenum blue. The phosphate complex retained on the Amberlite XAD-4 adsorbent was eluted with 10 mL acetone and analyzed with UV-Vis spectrophotometer at 732 nm ( 8 ). Restricted access materials (RAMs) have found a wide range of applications for 20 years. They have mainly used as sorbents for the separation and preconcentration of organic, inorganic and bio-active species without interference from matrix components that are excluded by chemical, physical or physicochemical means ( 9 , 10 ). The use of RAMs before detection systems

determined according to ÖNORM EN 16168 by elemental analysis using a CNS 2000 SGA-410-06 at 1,250°C. Nitrogen (N) mineralization potential on dried soils was measured by the anaerobic incubation method ( Keeney, 1982 ), modified according to Kandeler (1993) . Extractable P and K were determined with CAL (calcium acetate/lactate) according to Schüller (1969) and ÖNORM L1087 with spectral photometer (P, using molybdenum blue method) and flame photometer (K), using a Segmented flow Analyzer SAN (Skalar)). Magnesium (Mg) was analyzed by 0.0125 M CaCl 2 (method