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The Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1991

Treatment of the solution

6.1  With a pipette take an aliquot part of fertiliser extract (see the Table) containing about 0.01 g of P2O5 and put it in a 500 ml Erlenmeyer flask. Add 15 ml concentrated nitric acid(1) (4.1) and dilute with water to about 100 ml.

(1)

21 ml when the solution to he precipitated contains more than 15 ml of citrate solution (neutral citrate, Petermann or Joulie alkaline citrate).