H3BO3Boric Acid
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At this quite low temperature, reaction does not occur between precursors but H3BO3 is converted to B2O3 with the evaporation of water.
REF: V1/Dk2 Danish company specialising in wood treatment is looking for a supplier of boric acid (H3BO3).
La composicion del medio Nfb fue la siguiente (pH:5.5): acido malico: 3g/l; glucosa: 2g/l; [K.sub.2]HP[O.sub.4]: 5ml (sol.10%); MgS[O.sub.4]*7 [H.sub.2]O: 2ml (sol.10%); NaCl: 1ml (sol.10%); Ca[Cl.sub.2]*2 [H.sub.2]O: 2ml (sol.1%); azul de bromotimol: 2ml (0.5% en KOH 0.2N); solucion de micronutrientes: 2ml ([Na.sub.2][Mo.sub.4]*2 [H.sub.2]O: 0.2g/l; MnS[O.sub.4]: 0.235g/l; H3BO3: 0.28g/l; CuS[O.sub.4]*5 [H.sub.2]O: 0.008 g/l; ZnS[O.sub.4]*7 [H.sub.2]O: 0.024 g/l); EDTA-Fe: 4 ml (sol 1.64%); solucion de vitaminas: 1ml (biotina: 0.1g/l; piridoxal-HCl: 0.2g/l); agar: 2g/l.
In this process, sulfur dioxide was used instead of sulfuric acid to obtain H3BO3. The purpose of this research is to produce boric acid from a cheaper and more environmentally friendly process.
In first experiment, wheat seeds were primed with 1, 0.5, 0.1, 0.05 and 0.01 M B solutions of boric acid (H3BO3) and borax (Na2B4O7.10H2O) while dry seeds and hydropriming were taken as control.
Cells grown on suitable nutrient medium containing carbon nitrogen sources and inorganic salts (NaCl Na2SO4 KCl NaHCO3 KBr H3BO3 MgCl2.6H2O CaCl2.
The ciliate cultures of RE-1 and RE-2 were maintained in Bold-basal salt medium [NaNO3 (0.25 g/l), CaCl2.H2O (0.025 g/l), MgSO4.7H2O (0.075 g/l), K2HPO4 (0.075 g/l), KH2PO4 (0.175 g/l), NaCl (0.025 g/l), EDTA (0.05 g/l), KOH (0.031 g/l), FeSO4.7H2O (0.04 g/l), H2SO4 (0.001 M), H3BO3 (0.01142 g/l), ZnSO4.7H2O (0.00881 g/l), MnCl2.4H2O (0.00144 g/l), MoO3 (0.00071 g/l), CuSO4.5H2O (0.00157 g/l) and Co(NO3) 2.6H2O (0.00049 g/l)], diluted 1:1000 with distilled water, with 5-7 wheat grains (Shakoori et al., 2004).
The B and Zn in the form of boric acid (H3BO3) and zinc sulphate (ZnSO4) were applied through foliar spray according to following treatments; T1 = control (water spray), T2 = 0.3% boric acid at fruit set stage, T3 = 0.5% zinc sulphate at fruit set stage, T4 = 0.3% boric acid + 0.5% zinc sulphate at fruit set stage, T5 = 0.5% zinc sulphate + 0.3 % boric acid at premature stage.
Other chemicals used in the study were like, sodium carbonate (Na2CO3), potassium carbonate (K2CO3), calcium carbonate (CaCO3), sodium sulphate (Na2SO4), magnesium carbonate (MgCO3), boric acid (H3BO3) and aluminium oxide (Al2O3).