Hidrológiai Közlöny 1933 (13. évfolyam)
Gedeon Tihamér: Szulfátos vizek képződése
104 Tihamér Qedeon A! we find that much more sulfuric acid should be wanted than could be formed out of the sulphur of pyrites. Blue clay of Őrsöd: Silt of Törökszenlmiklós Blue clay of flaut: Component H2SO4 Comp. : grams of II2SÖ4 Comp. : grams of H2NO4 grams: wanted : ?: wanted : wanted: CaO 8.97 15.69 5.60 9.80 3.00 5.25 K2O 1.85 1.94 0.09 0.10 — NaaO 1.33 2.11 4.38 6.93 — — MgO 2.99 7.27 1.84 4.47 0.08 0.19 AhOs 12.73 36.64 14.28 41.14 20.52 59.07 Amounts of H2SO4 formed of the present S-compounds: S 0.16 0.49 2.25 6.88 19.20 58.74 SOs 0.65 0.79 0.09 0.11 — — The mining of the pyriteous layer accelerates also the oxyda tion of the pyrites got to the surface and the formation of sulfate containing waters becomes more intensive. The infiltration water of the testing shaft at Qánt—Gránáshegy is a characteristic example. This water was namely at the digging almost tasteless but turned in the course of some days to a sweet-tart taste. 1 4 Mine waters very rich in sulfates used to be found on vulcanic regions where sulfideous lodes where formed under postvulcanic influences, mostly after the opening of such lodes. Their formation is a continuous process on the large oxydation surface of the mines. Such water is e. g. the „Aknalug" (shaft water) of Párád which is used also as a healing mineral water. 1 5 The outflow waters of coal mines of coal reagions rich in pyrites also contain much sulfateseven_free sulfuric acid (e. g. the region near to Pécs). The formation of limomite is a process connected with the formation of sulfate containing waters. During the oxydation of the pyrite namely one molecule sulfuric acid forms ferrosulfate with the iron content of the pyrite. This ferrosulfate then — being an undurable compound — gets oxydated in the presence of water to ferrihydroxyde (limonite). By this process the sulfuric acid becomes free once more and takes its part within the formation of the sulfate containing water. E. g. 2FeS0 4 + 2MgCO:!+3HaO + 0^2Fe(0H) 3+2MgS04 + 2CO > " Gedeon T.: Hidrológiai Közi., XL 82. 1931. 1 5 See foot-note 7. page 111.
