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This International Standard specifies a method for the determination of castor oil seed (Ricinus communis) husks in single and compound animal feeding stuffs and, in particular, in oilseed residues.

The limits of detection is 5 mg/kg.

The method requires final microscopical identification of the isolated husks. This last phase therefore requires a specialist who has had sufficient experience in this type of identification and who is experienced in microscopic techniques.