ISO-771-1977.pdf
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1、w - INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEXAYHAPOAHAR OPrAHW3AUWJl l-IO CTAHAAPTM3AIiH *ORGANISATION INTERNATIONALE DE NORMALISATION Oilseed residues - Determination of moisture and volatile matter content Tourteaux de graines olkagineuses - Determination de Ia ten
2、eur en eau et mati then grind the rest, collect the grindings, mix carefully and carry out the analysis without delay. 6.2 Test Portion 6.2.1 Weigh the vessel (5.4) with its Iid, after leaving it open for at least 30 min in the desiccator (5.6) at laboratory temperature. 6.2.2 Weigh into the vessel
3、about 5 g of the test Sample (6.1.2), spread this uniformly over the whole base of the vessel, close the vessel with its lid and re-weigh. Carry out these operations as quickly as possible, in Order to avoid any appreciable Change in moisture content. 1) In preparation. Copyright International Organ
4、ization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 21:46:46 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 771-1977 (E) 6.3 Determination Place the vessel containing the test Port
5、ion in the oven (5.5), which has previously been set to operate at 103 + 2 C, and take off the lid (see 8.1). After 2 h, reckoned from the time when the temperature returns to 103 * 2 C, and t a k e off the lid (see 8.1). Close the oven. After 2 h, reckoned from the time when the temperature returns
6、 to 103 C, open the oven, replace the lid on the vessel before removal from the oven and transfer to the desiccator. As soon as the vessel has cooled to Iaboratory temperature, weigh it. Return the vessel, with the lid removed, to the oven. After 1 h, repeat the operations of closing the vessel, all
7、owing to cool, and weighing. If the differente between the two weighings is equal to or less than 0,005 g, regard the determination as finished. If not, subject the test Portion to successive 1 h periods in the oven, until the differente between two successive weighings is equal to or less than 0,00
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- ISO 771 1977
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