硼砂 BP 欧洲药级

Borax BP Eur Grade

Borax BP; Sodium Borate; Sodium TetraborateNa2B4O7,10H2O -- 381.4 -- CAS 1303-96-4

DEFINITIONBorax contains not less than 99.0 per cent and not more than the equivalent of 103.0 per cent of disodium tetraborate decahydrate.

CHARACTERSA white, crystaler, colourless crystals or crystales, efflorescent, soluble in water, very soluble in boiling water, freely soluble in glycerol.

IDENTIFICATIONA. To 1 ml of solution S (see Tests) add 0.1 ml of sulric acid and 5 ml of methanol \ and ignite. The flame has a green border.B. To 5 ml of solution S add 0.1 ml of nolhalein solution. The solution is red. On the addition of 5 ml of glycerol (85 per cent) the colour disappears.C. Solution S gives the reactions of sodium.

TESTSSolution SDissolve 4.0 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.Appearance of solutionSolution S is clear and colourless.br>The of solution S is 9.0 to 9.6.Sultes15 ml of solution S complies with the limit test for sultes (50 ppm).Ammonium6 ml of solution S diluted to 14 ml with water complies with the limit test for ammonium (10 ppm).Arsenic5 ml of solution S complies with limit test A for arsenic (5 ppm).Calcium15 ml of solution S complies with the limit test for calcium (100 ppm).Heavy metals12 ml of solution S complies with limit test A for heavy metals (25 ppm).