BS ISO 771:2021 pdf download – Oilseed meals — Determination of moisture and volatile matter content This document specifies a method for the determination of the moisture and volatile matter content of oilseed meals obtained by the extraction of oil from oilseeds by pressure and/or solvent. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5502, Oilseed residues — Preparation of test samples 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 3.1 moisture and volatile matter content loss in weight measured under the operating conditions specified in this document Note 1 to entry: The moisture and volatile matter content is expressed as a mass fraction in grams per 100 g. 4 Principle The sample is ground to a particle size of 1 mm, followed by drying of a test portion at (103 ± 2) °C in an oven at atmospheric pressure, until practically constant mass is reached. 5 Apparatus 5.1 Analytical balance, readability 0,000 1 g, weighing precision 0,001 g. 5.2 Mechanical mill, easy to clean and allowing the meals to be ground, without heating and without appreciable change in the moisture, volatile matter and oil content, to particles passing completely through the sieve (5.3). 5.3 Sieve, with apertures of diameter 1 mm. 5.4 Flat-bottomed vessel, of metal, resistant to attack under the test conditions, provided with a well fitting lid and allowing the test portion to be spread to about 0,2 g/cm 2 (e.g. diameter of vessel 50 mm to 70 mm, height about 30 mm). Glass vessels with ground closures may also be used. 8 Expression of results — Method of calculation and formula The moisture and volatile matter content w, as a mass fraction in grams per 100 g, is given by Formula (1): where m 0 is the mass, in grams, of the vessel; m 1 is the mass, in grams, of the vessel and test portion before drying; m 2 is the mass, in grams, of the...
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