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Feeding Stuffs (Sampling and Analysis) Regulations (Northern Ireland) 1999

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3.2    Reagents

Formaldehyde solution: the strength of the commercially available solution should be checked as follows: mix 3 ml formaldehyde solution with 50 ml 1N sodium hydroxide solution and 25 ml hydrogen peroxide solution (20 volumes). Heat on a steam bath until effervescence stops. Cool, and titrate with 1N hydrochloric acid using phenolphthalein indicator. Carry out a blank titration using 3 ml water in place of the formaldehyde.

  • 1 ml of 1N sodium hydroxide ≡ 0.0300 g formaldehyde

  • strength of formaldehyde solution ≡

    No math image to display

    where:

    • B = blank titre; and

    • T = sample titre.

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