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

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Determination
Preparation of sample and blank test solutions

6.3—6.3.1 Dilute the sample solutions (6.1.1 or 6.1.2) and the blank test solution (6.2) with 0.5 N hydrochloric acid solution (3.3) to a concentration within the optimal measuring range of the spectrophotometer.

Preparation of the calibration solution

6.3.2 By diluting the standard solution (3.5.2) with 0.5 N hydrochloric acid solution (3.3) prepare at least 5 standard solutions corresponding to the optimal measuring range of the spectrophotometer.

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