ACH - Models in Chemistry 136. (1999)

1–2. szám - 40TH HUNGARIAN CONFERENCE ON SPECTROCHEMISTRY - Czövek, Z.–Gáspár, A.–Braun, M.–Posta, J.: Atomic spectrometric determination of vanadium in oils using different sample pretreatment methods

ЛСц - MODELS IN CHEMISTRY 136 (1-2), pp 95-101 (1999) Atomic spectrometric determination of vanadium in oils using different sample pretreatment methods+ Zoltán Czövek, Attila Gáspár, Mihály Braun and József Posta* Department of Inorganic and Analytical Chemistry, Lajos Kossuth University, P.O. Box 21, H-4010 Debrecen 10, Hungary Received August 31, 1997 A bomb calorimeter was modified for the pretreatment of oil and other organic samples that can be digested with difficulty for analysing their metal contents. In the case of digestion of these sample types, the efficiencies of ashing, microwave digestion and burning in bomb calorimeter were compared. These sample pretreatment methods were considered from the point of view of the extraction and determination of vanadium. The total vanadium, Vlv and Vv concentrations were studied in ashes obtained by burning oils at different temperatures. Introduction The research of vanadium and its compounds was not put great emphasis on till the 1930’s. It caused great surprise when 180 pg/g vanadium was found in the Amanita muscaria fy-agaric [1]. Following this result, various natural samples were examined. The results showed that vanadium occurs in ore and natural oils in the greatest concentration [2]. The oil fractions with high boiling points obtained by industrial distillation of crude oils like asphalt and black oil contain vanadium even in 1000 pg/g concentration. It is well-known that a lot of power plants produce energy by burning black oil. Concentration of vanadium greater than the average can be shown in airborne dust near the power plant (Százhalombatta) [3]. The most important questions are that in what extent and in what oxidation state the vanadium gets into environment due to the pollution of power plants burning black oil. The reason for this is that the biological effects of Vv and Viv, the two oxidation forms of the vanadium, differ from each other. The inhalation of airborne dust of V205 is toxic but numerous complexes of Vlv have an insulin-analogue effect [2). + Presented at the 40th Conference on Spectrochemistry, held at Lajos Kossuth University, Debrecen, Hungary, June 29-July 3, 1997 * To whom correspondence should be addressed

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