The Fertilisers (Sampling and Analysis) Regulations 1996 No. 1342

SCHEDULE 2 METHODS OF ANALYSIS

PART I

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

4.4.    REAGENTS

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).