Carbon forms in formation waters from the Pannonian Basin, Hungary

Comparative study on humic substances isolated in thermal groundwaters from deep aquifers below 700 m

“…Most geochemical studies of thermal waters are focused on isotope composition of the water as well as major and minor dissolved ions or trace elements (Varsányi et al, 1997;Kralj, 2004;Yalcin, 2007;Parello et al, 2008;Fekete et al, 2009). The investigation of organic compounds in thermal waters has attracted much less attention apart from some exceptions (Kárpáti et al, 1996(Kárpáti et al, , 1999Varsányi et al, 2002;Di Gioia et al, 2006;González-Barreiro et al, 2009;Fekete et al, 2009). The origin of HS isolated from groundwater of different depths on the basis of elemental and isotopic composition as well led by water temperature.…”

Interaction and variation of isotopic age, temperature, organic and inorganic solutes in Hungarian thermal waters

“…Recently Varsányi et al (2002) discussed quantitatively the contribution of humic substances, acetate, propionate and aromatic compounds to organic material dissolved in thermal waters of SE Hungary, mostly south of the Kõrös River. Vetõ et al (2004a) reported concentrations and isotopic composition of methane in thermal waters of SE Hungary and discussed pathways of bacterial methanogenesis.…”

“…Kárpáti et al 1995Kárpáti et al , 1996aKárpáti et al , b, 1999Varsányi et al 2002;Varsányi and Kovács 2009;Vetõ et al 2004b). The results of this study have shown a similar distribution of HCO3 -concentration and sodium-bicarbonate ratios.…”

“…Aromatic hydrocarbons appeared at a threshold temperature of 80°C, followed by phenols at ~90 °C, and in the hottest waters (>90 °C) fatty acids were identified. In the homologue series demethylation was associated with increasing temperature, leading to a decrease of the relative abundances of the higher molecular-sized members and a clear predominance of the compounds containing less carbon atoms.Recently Varsányi et al (2002) discussed quantitatively the contribution of humic substances, acetate, propionate and aromatic compounds to organic material dissolved in thermal waters of SE Hungary, mostly south of the Kõrös River. Vetõ et al (2004a) reported concentrations and isotopic composition of methane in thermal waters of SE Hungary and discussed pathways of bacterial methanogenesis.…”

Dél-kelet alföldi termálvizekből kinyert humuszanyagok jellemzése

“…Eredményei alapján a szerves szén 11-66%-a alkotja a humuszanyagokat. Petróleum vagy olajmezıvel kapcsolatban lévı felszín alatti vízben a szerves szén koncentrációja akár az 1000 mg L -1 -es értéket is meghaladhatja, azonban a szerves szén ezekben a vizekben döntıen rövid szénláncú alifás sav anionok (acetát, propionát), valamint metán formájában van jelen (Willey et al, 1975;Varsányi et al, 2002 (Varsányi, 1985;Varsányi & Bertalan Balogi, 1985). Más esetekben a vízmintát Fluka huminsav oldattal hasonlították össze, mely utóbbit sztenderdként használtak, és ennek alapján adtak meg közelítı értéket a huminsav tartalomra vonatkozóan (Varsányi et al, 1997;Kárpáti et al, 1999).…”