ISO 9648:1988
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ISO 9648:1988
17487

Status : Published (Under review)

This standard was last reviewed and confirmed in 2021. Therefore this version remains current.
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Format Language
std 1 42 PDF
std 2 42 Paper
  • CHF42
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Abstract

The method consists in extraction by shaking with dimethylformamide, then after centrifuging, addition of ferric ammonium citrate and ammonia to an aliqiot part of the supernatant liquid and spectrometric determination, at 525 nm, of the absorbance of the solution thus obtained, and determing of the tannic content using a calibration curve prepared using tannic acid.

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General information

  •  : Published
     : 1988-12
    : International Standard confirmed [90.93]
  •  : 1
     : 3
  • ISO/TC 34/SC 4
    67.060 
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