SCHEDULE 2METHODS OF ANALYSIS

PART I

26e.DETERMINATION OF BORON IN FERTILISER EXTRACTS BY MEANS OF ACIDIMETRIC TITRATION

REAGENTS4.4

Standard sodium hydroxide solution, about 0.025 M

Must be free of carbon dioxide. Dilute the 0.5 M sodium hydroxide solution (4.3) 20 times with boiled water and mix thoroughly. The value of the solution expressed as boron (B) is to be determined (see paragraph 9).