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Division 6.2 Preliminary examination of the prepared sample

United Kingdom

Original text. Later amendments are not shown.

  1. 6.2.1Unless the reducing power (2.1) of the prepared sample is known approximately, it is necessary to carry out a preliminary examination in order to obtain an approximate figure for it so that the mass of the test portion (6.3) can be calculated.
  2. 6.2.2Division 6.2.2
  3. 6.2.3Division 6.2.3
  4. 6.2.4Division 6.2.4
  5. 6.2.5Division 6.2.5
  6. 6.2.6Division 6.2.6
  7. 6.2.7Division 6.2.7
  8. 6.2.8Immediately boiling has started, start the stop-watch (5.6) from zero and commence adding sample solution to the flask from the burette in 1·0 ml increments at intervals of approximately 10 seconds until the blue colour of the methylene blue is discharged.
  9. 6.2.9Division 6.2.9
  10. 6.2.10The approximate reducing power of the prepared sample in percent by mass is given by: