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Description of BS ISO 6849:1996 1997This 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 0,1Â mg/l and higher. In the range 0,1Â mg/l to 5Â mg/l, phosphate is removed by precipitation by lead acetate. In the range 1Â mg/l to 100Â mg/l, the sample is diluted 25 times; this eliminates phosphorous interference if the phosphorous concentration is below 500Â mg/l. The second and alternative method is a spectrophotometric technique using methylene blue and is useful in the boron range of 0,1Â ml/l to 1,0Â mg/l, this being the concentration likely to be encountered in photographic processing wastes.
About BSIBSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. |
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