ISO 771-2021 pdf download

ISO 771-2021 pdf download.Oilseed meals – Determination of moisture and vo) lati le matter content. 5.5 ElectrIc oven. with thermostatic control and good natural vennbton, capable o being regulated so that the temperature of the air and of the shelves in the neighbourhood of the test portions lies between 101 C and 105 ‘C In normal operation. 5.6 DesIccator. containing an efficient deiiccant and provided with a metal plate that allows vessels (5.4) to cool rapidly 6 Sample 6.1 Sampling Sampling is not part of the method specified in this document. A recommended sampling method is given in ISO 5500. A representative sample should have been sent to the Laboratory. It shonki not have been damaged or changed during transport or storage. 6,2 Preparation of test sample Prepare the test sample in accordance with ISO 5502. Grind the contract sample in the previously well• deanrd mechanical mill (52). collect thegrindings, mix carelully and carryout the analysis without delay. 7 Procedure 7.1 Carry out two detennanatios an each sample. 73 Weigh the vessel to the nearest 0.001 g with the lid (5.4). afler leavIng it open for at least 30 nun in the desiccator (5.6) ii laboratoty temperature. Note mass n, 73 Weigh, to the nearest 0.00 1 g. about S g o(the test sample Into the vessel (5.4). spread the sample unifonn)y over the whole base o( the vessel, and re-weigh with its lid Carry out these operations quickly as possible, in order to avoid any appreciable change in moisture content. Note mass rn1 7.4 Place the vessel with the test portion in the oven (5,5). which has previously been set to a temperature of (103 * 2) Cand take of the lid. It several vessels are In the oven together, arrange them in such a way that air can circulate freely between them. 7.5 Close the oven, After 2 h, reckoned from the tUne when the temperature in the oven has returned to (103 a 2) °C, open the overt replace the lid on the vessel before removal from the oven and transfer to the desiccator, As soon as the vesiel has cooled to laboratory temperature, weigh it to the nearest 0,001 g. l)uring the drying, do not open the oven to add other test portions, 7.6 Return the vessel, with the lid removed, to the oven. After 1 h. repeat the operations olelocing the vesseL, allowing to cool,...