Organics in Water-Rock Interactions

Does variscite control phosphate availability in acidic natural waters? An experimental study of variscite dissolution rates

“…Arp and Meyer, 1985), which have been suspected of affecting the dissolution rates of some minerals (e.g. Ganor et al, 2009), rates generated using these solutions are consistent with those obtained in buffer-free solutions (see below).…”

Effect of the heterotrophic bacterium Pseudomonas reactans on olivine dissolution kinetics and implications for CO2 storage in basalts

“…Over the past decades, extensive research has been done on the effect of organic ligands on mineral dissolution rate (see Ganor et al, 2009 for review). We do not anticipate any significant olivine rate increase in the presence of natural organic matter at the CO 2 sequestration site because of low concentration of total DOC (0.5-1.2 mg/L at the Hellisheidi site, Shirokova et al, 2009 small-size organic ligands in deep aquifers is certainly lower than that measured in soil solutions (1-50 lM, Jones, 1998;Van Hees et al, 2005).…”

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

“…In the trioctahedral structure, the -OH dipole is perpendicular to the biotite (0 0 1) base so that there is a short distance between H-and K-, which leads to the increase of repulsion, a slack K-bond, and K + is easily released (Bassett, 1960). The location of potassium loss in biotite determines the release pattern of potassium in two ways including (1) exchange interaction, H + or Na + cation exchanges K + from the edge of the (h k 0) and interlayer via kinks or defect sites on the biotite (0 0 1) surface, which will not lead to evident alteration on a biotite structure (Hu et al, 2011); (2) hydrolysis, H + reacts with Al-O-Al and Si-O-Si to break the lattice charge-balancing and release K + , which will destroy the mica crystal structure (Ganor et al, 2009;Munson, 1985). Biotite has abundant K, which is one of the three most essential nutrients for plants (Ren et al, 2013;Samal et al, 2010;Steingrobe and Claassen, 2000).…”