J 2015

Iontová výměna v počátečních stádiích interakce živec-voda

CAMFRLOVÁ, Markéta; Jiří FAIMON a Karel VYBÍHAL

Základní údaje

Originální název

Iontová výměna v počátečních stádiích interakce živec-voda

Název anglicky

Ion-exchange during initial stages of feldspar – water interaction

Autoři

CAMFRLOVÁ, Markéta; Jiří FAIMON a Karel VYBÍHAL

Vydání

Geologické výzkumy na Moravě a ve Slezsku, Masarykova univerzita, 2015, 1212-6209

Další údaje

Jazyk

čeština

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

feldspar dissolution; ion exchange; alkali metals/H+ ratio; dissolution; PHREEQC simulation
Změněno: 28. 1. 2016 14:08, Mgr. Markéta Camfrlová

Anotace

Anglicky

The sample of perthitic alkali feldspar (62.5 wt. % of KAlSi3O8 and 37.5 wt. % of albite, Na0,996Ca0,004Al1,004Si2,996O8) was dissolved in a special stirred batch reactor (polyethylene vessel of 5 liter volume situated horizontally and rotating at few rotations per hour). The reactor was opened to atmosphere (log PCO2 ~ -3.5) through the mouth at the vessel axis. During the experiment, pH was monitored by pH-meter with combined glass electrode. Solutions were analyzed for Si, Al (spectrophotometry), K, Na (flame AAS), and Ca (ICP-OES). The results showed a fast preferential leaching of alkaline cations with respect to both Al and Si during the early stages of experiment that was diminishing during more advanced stages of the experiment. The released cations exceeded the consumed H+ ions by the range of two up to four magnitudes. The preponderance of cations over H+ ions was especially apparent during few initial days, when the buffering by atmospheric CO2 was insufficient. Simulation of the process by the PHREEQC code covering the CO2 buffering indicated that system feldspar–water–CO2(g) was evolving near the equilibrium in open system during the period after 5th day of the experiment. The results suggested that the mechanism of feldspar dissolution during the initial stages of the process does not correspond to a simple ion exchange and that it is more complicated