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BS 5551-4.3.3:1984 Fertilizers. Chemical analysis. Determination of potassium. Method for determination of water-soluble potassium content (potassium tetraphenylborate gravimetric method: reference method)
standard by BSI Group, 08/31/1984
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Specifies reagents, apparatus, procedure and reporting of results.Cross References:
BS 3978
BS 5551:Subsection 4.3.1