Computer Science
Scientific paper
May 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.1339b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 37, Issue 5, pp.1339-1351
Computer Science
2
Scientific paper
Clay minerals synthesized under surface conditions take up boron in proportion to the concentration of boron in the solution. A synthetic montmorillonite contained 2160 ppm B when precipitated from a solution containing 5 ppm B and having a pH of 8.5. The fixation of B by the synthetic clay mineral is greatly reduced by a high - HCO 3 concentration in the solution. Part of the fixed boron is incorporated into the tetrahedral sheet of the clay mineral structure, whereas the remainder is present in the form of a Mg borate-like complex. Mg borate-like complexes similar to those found in the synthetic clay may also occur in detrital clays. This possibility was examined experimentally using natural illite and montmorillonite suspended in solutions containing boron alone and magnesium-boron in combination at pH 8-9 and 10. The results show that more B was sorbed from solutions containing both Mg and B than from solutions containing B alone. For example, at pH 8, montmorillonite takes up 18 ppm B from the combination solution and 11 ppm from a solution containing only B. In a similar experiment, illite takes up 28 and 20 ppm B, respectively. It is suggested that B in natural clays is fixed partly as a Mg-borate-like complex. This complex probably formed as a first step by sorption of B to Mg(OH) 2 , which may be present in clays. These results should apply to the interpretation of the boron content of recent clayey sediments
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