Boric acid-borax buffer

However, it is worth noting that while the Swedish warship Vasa is still contaminated with sulfur and generating acid, it is now apparent that during its treatment by spraying a considerable amount of acid was generated, as the pH of the spray solution kept falling. This was neutralised by the addition of borax/boric acid buffer. In the case of the Vasa, the major sulfur contaminant appears to be elemental sulfur that is essentially insoluble in water. However,... 

Thus, in an acid buffer such as borax-boric acid or Na2HP04-NaH2P04 (p. 521) ... 

The I2O7 content of the periodates described is determined as follows The weighed sample is covered with 20 ml. of water, and 5 to 10 drops of 6N HC1 is added to hasten solution. No chlorine is liberated from the acid of this concentration. The solution is diluted to 100 ml., made just alkaline to phenolphthalein paper with borax, buffered with borax and boric acid (Muller and Wegelin Z. anal. Chem., 52, 755-759 (1913), and an excess of potassium iodide is added. Under these conditions, the periodate is reduced to iodate. The liberated iodine is titrated with 0.1N arsenite. 

As far as the general composition of superfine grain developers, nearly all of them have a high sodium sulfite content as sodium sulfite is an effective silver solvent. For an alkali, they use small quantities of either carbonate or borax in order to minimize the energy of the developer and produce a finer grain. FX 10 uses a buffering mixture of borax and boric acid, whereas Windisch Superfine Grain Developer uses sodium metabisulfite to reduce the pH of the sodium sulfite. 

The buffer mixtures of Palitzsch (l.c.) prepared from boric acid and borax are listed in the following table. The data refer to a temperature of 18°. 

G. Manov, N. DeLolUs and S. Acree, Ionization constant of boric acid and the pH of certain borax-chloride buffer solutions from 0° to 60° C, /. Res. Natl. Bur. Stand., 1944,33,287-306. 

It is preferable to use a boric acid-borax buffer, because this buffer system has a very low buffer capacity at the pH value of the tear film and at any lower pH. Boric acid is a weak acid. Boric acid-borax buffer solutions reacts neutral to weakly basic. 

Equal vols. of amyl alcohol containing 1% (v/v) di-2-ethyl hexyl phosphate and 0.5% sodium chloride in borate buffer (0.62 g boric acid, 0.21 g borax) are mixed. Adjust pH to 8.0 with sodium hydroxide while stirring for 30 min. Separate phases dip paper in lower phase, blot, apply samples and dry several minutes. While still wet develop with organic phase either ascending or descending Detection... 

Reed and Gilding found that pH changes had no effect on in vitro degradation of LA/GA polymers in citrate-phosphate buffers at pH 5 and 7 and boric acid-borax buffer at pH 9. Any sensitivity of LA/GA polymers to pH was actually dominated by the combined effects of crystallinity and hydrophobicity [111]. Kenley et al, studied the in vitro degradation of PLA25GA50 cylindrical samples in aqueous buffers with pH varying from 4.5 to 7.4 at 37 [63]. They... 

Borax forms mildly alkaline solutions and is an excellent pH buffer. This is due to the weak Lewis acidity of boric acid and its underlying acid dissociation reaction ... 

The element boron forms strong bonds with oxygen. The resultant borates include boric acid, boric oxide, alkali, ammonium, and alkaline earth metal borates. All except for the alkaline earth borates are reasonably water soluble. When dissolved borates release boric acid, a Lewis acid, and its conjugate base, the tetrahydroxyborate anion. Borax, a form of di-sodium tetraborate, releases equimolar amounts of these species and consequently is an excellent mildly alkaline pH buffer. Borates exhibit several important behaviors in solution, including the sequestration of water hardness ions, the ability to form borate esters with polyols, and to deliver the oxidant hydrogen peroxide into solution from the dissolution of sodium perborate. 

M boric acid/0.005 M borax buffer, 0.005 M in naphthalene sulfonate pH 8 with or without 30% CH3CN... 

C4-C14 alkanesulfonates separation by decreasing alkyl chain length CZE Silica, 50 pm x 49 cm 0.1 M boric acid/0.005 M borax buffer, 0.005 M in naphthalene sulfonate pH 8 with or without 30% CH3CN Cathodic, indirect UV, 274 nm 25... 

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