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BSI BS ISO 6849:1996

Photography. Processing wastes. Determination of boron
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BSI BS ISO 6849:1996

Photography. Processing wastes. Determination of boron

PUBLISH DATE 1997
BSI BS ISO 6849:1996

This International Standard specifies two methods for the determination of boron in photographic processing wastes. The first method is the estimation of borates by titration of the boric acid-mannitol complex, which is a stronger acid than the boric acid from which it is formed. It is suitable for boron concentrations of 0,1 mg/l and higher. In the range 0,1 mg/l to 5 mg/l, phosphate is removed by precipitation by lead acetate. In the range 1 mg/l to 100 mg/l, the sample is diluted 25 times; this eliminates phosphorous interference if the phosphorous concentration is below 500 mg/l.

The second and alternative method is a spectrophotometric technique using methylene blue and is useful in the boron range of 0,1 ml/l to 1,0 mg/l, this being the concentration likely to be encountered in photographic processing wastes.

SDO BSI: British Standards Institution
Document Number ISO 6849
Publication Date March 15, 1997
Language en - English
Page Count
Revision Level
Supercedes
Committee CPW/42
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