ISO 663:2017 pdf free

ISO 663:2017 pdf free.Animal and vegetable fats and oils – Determination of insoluble impurities content
Dry the fiter paper and the vessel (6.5) with its lid, or the filter crucible (6.6), in the oven (6.2) set at 103 °C. Allow to cool in the desiccator (6.4) then weigh to the nearest 0,001 g. For acid oils, prepare the crucible as described in 9.2.7 and continue as in 9.2.2.
Add 200 ml of n-hexane or light petroleum (5.1) to the flask containing the test portion (9.1). Stopper the flask and shake.
For castor oil, the quantity of solvent may be increased to facilitate the operation and this may necessitate the use of a larger flask.
Leave to stand at about 20°C for about 30 min.
Filter through the filter paper in a suitable funnel or through the filter crucible, using suction if necessary. Rinse the flask to ensure that all impurities are washed into the filter/crucible.
Wash the filter paper or filter crucible by pouring through it small amounts of the same solvent as used in 9.2.2, but no more than is necessary for the final filtrate to be free from fat or oil. Warm the solvent, if necessary, to a maximum temperature of 60 °C in order to dissolve any solidified fats retained on the filter.
If a filter paper is used, remove it from the funnel and place it in the vessel. Allow most of the solvent remaining in the filter paper to evaporate in air and complete the evaporation in the oven set at 103 °C. Then remove from the oven, close the vessel with its lid, allow to cool in the desiccator (6.4) and weigh to the nearest 0,001 g.
If a filter crucible is used, allow most of the solvent remaining in it to evaporate in air under a fume hood and complete the evaporation in the oven set at 103 °C. Then remove from the oven, allow to cool in the desiccator (6.4) and weigh to the nearest 0,001 g.
If it is desired to determine the content of organic impurities, the use of a previously dried and weighed, ashless filter paper is necessary. In this case, the filter paper containing the insoluble impurities shall be ignited and the mass of ash obtained subtracted from the mass of insoluble impurities.
The organic impurities content, expressed as a percentage by mass, is then calculated by multiplying this difference in mass by 100/m0, where mo is the mass, in grams, of the test portion.
If analysing acid oils, coat the glass filter crucible with kieselgur (5.2) as follows. In a 100 ml glass beaker, prepare a slurry consisting of 2 g of kieselgur and approximately 30 ml of light petroleum (5.1). Pour the mixture into the filter crucible under reduced pressure in order to obtain a layer of kieselgur on the glass filter.ISO 663 pdf download.