Experimental dissolution vs. transformation of micas under acidic soil conditions: Clues from boron isotopes

A nano-scale study of the mechanisms of non-exchangeable potassium release from micas

“…These results indicated that NEK released through the exchange with hydrated cations by the two acid extraction methods, boiling HNO 3 and hot HCl, accounted for 87.88% and 83.23% of the total K extracted from biotite, and 85.93% and 78.31% of the total K extracted from muscovite, respectively. Voinot et al (2013) also found that, in the presence of HCl, the transformation rate of biotite was significantly greater than the dissolution rate of biotite based on boron (B) isotopes in biotite. However, K extracted by NaTPB almost totally a cation-exchange reaction.…”

Effects of citrate on the dissolution and transformation of biotite, analyzed by chemical and atomic force microscopy

“…The reaction between organic acids and minerals involves the processes of dissolution and transformation in farmland ecosystem (Everl, 1984;Voinot et al, 2013). In Fig.…”

“…In the presence of H + ions, aluminosilicate reacts according to the equation: Al 2 Si 2 O 5 (OH) 4 + 6H + = 2Al 3+ + 2H 4-SiO 4 + H 2 O (Kalinowski and Schweda, 1996); therefore, the coating was speculated to be an amorphous Si-bearing mineral (Shao et al, 2011;Teng et al, 2001;White and Brantley, 1995). Through the clues from boron (B) isotopes in biotite, researchers found that when pH > 4.0, the transformation rate of biotite was significantly greater than the dissolution rate of biotite (Voinot et al, 2013), namely, in a closed and steady environment, the growth of nucleation was relatively effortless on the solid-liquid interface (Pachana et al, 2012).…”

Matrix effects and mass bias caused by inorganic acids on boron isotope determination by multi-collector ICP-MS

“…The typical operating conditions for boron isotope measurement and measuring strategies are summarized in the report of Wei et al 18 Before commencing the analytical session, the instrument was tuned to a robust condition in which small changes in X or Z positions of the torch or sample gas ow rate induce little uctuation in 11 Acid effects. In order to study possible acid effects of inorganic acids, three types of inorganic acids, HCl, HNO 3 , and HF, were used in this study.…”