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EC number: 234-522-7
CAS number: 12007-92-0
Inorganic borates (e.g., boric acid, sodium tetraborates) are soluble in
water.. The chemical species present in solution depend on concentration
Only two soluble B species in ordinary soils can be expected (Adriano,
2001). The nonionized species, [B(OH)3], is the predominant species
expected in soil solution. Boric acid, [B(OH)3], is a very weak,
monobasic acid that acts as a Lewis acid by accepting a hydroxyl ion to
form the borate anion, [B(OH)4]-. At pH greater than 9.2, [B(OH)4]-
B(OH)3 + 2H2O ↔ [B(OH)4]- + H3O+ pKa = 9.2
In the pH range of 7 to 11, both species can be found. With higher boron
concentrations (B > 0.025 M) and increasing pH also polymeric B forms
can precipitate, which are commonly very rare and unstable in soils.
Therefore, boric acid and borate ions are the predominant B-forms in the
natural soil system (Power and Woods, 1997; de Vette et al., 2001).
Boron as a natural element is not degradable. However, boron and its
inorganic compounds are subject to chemical transformation processes
(adsorption, complexation, precipitation,fixation) once released to the
environment. One consequence of the transformation is that the
mobility/bioavailability and the potential for toxicity, induced by the
borate species, is changed and in many cases reduced or even removed
over time. Thus, these natural processes achieve a similar result as is
sought in the demonstration of biotic and abiotic degradation of
synthetic organic chemicals.
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