BS EN 14112 pdf free download

BS EN 14112 pdf free download. Fat and oil derivatives — Fatty Acid Methyl Esters (FAME) — Determination of oxidation stability (accelerated oxidation test).
3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 induction period time which passes between the moment when the measurement is started and the moment when the formation of oxidation products begins to increase rapidly 3.2 oxidation stability induction period determined according to the procedure specified in this European Standard, expressed in hours 4 Principle A stream of purified (dried) air is passed through the sample which has been heated to the target temperature which is 110 °C in the usual application of the method. Volatile compounds are formed during the oxidation process. They are, passed together with the air into a flask containing demineralized or distilled water, equipped with a conductivity electrode. The electrode is connected to a measuring and recording device. It indicates the end of the induction period by rapid increase of the conductivity due to the dissociation of volatile carboxylic acids produced during the oxidation process and absorbed in the water. For more details on the background of the method see Annex A. 5 Reagents and materials Use only reagents of analytical grade and distilled or demineralized water. 5.1 Ternary solvent mixture, consisting of methanol/toluene/acetone 1:1:1 (by volume). 5.2 Alkaline laboratory glass cleaning solution. 5.3 2-Propanol. 6 Apparatus Usual laboratory equipment and glassware, together with the following: 6.1 Device for the determination of oxidation stability, comprising the following parts (see Figures 1 and 2) 1) . 6.1.1 Air filter, comprising a tube fitted with filter paper at the ends and filled with a molecular sieve (6.6), connected to the suction end of a pump. 6.1.2 Gas membrane pump, with an adjustable flow rate of (10 ± 1,0) l/h. 6.1.3 Reaction vessels of borosilicate glass, provided with a sealing cap. The sealing cap shall be fitted with a gas inlet and outlet tube. 6.1.4 Closed measurement cells, of approximately 150 ml capacity, with an air inlet tube extending to the bottom inside of the vessel. The cell shall have ventilation holes at the top. 6.1.5 Electrodes, for measuring conductivity within a range of 0 μS/cm to 300 μS/cm aligned with the dimensions of the measurement cell (6.1.4). 6.1.6 Measuring and recording apparatus, comprising: a) an amplifier; and b) a recorder registering the signal of each of the electrodes (6.1.5). 6.1.7 Thyristor and contact thermometer graduated in 0,1 °C or Pt 100 element to measure the block temperature, with attachments for relay connection and an adjustable heating element; temperature scale 0 °C to 150 °C. 6.1.8 Heating block, made of cast aluminium, adjustable to a temperature up to (150 ± 0,1) °C. The block shall be provided with holes for the reaction vessels (6.1.3) and an aperture for the contact thermometer (6.1.7). Alternatively a heating bath may be used, filled with oil suitable for temperatures up to 150 °C, and adjustable to the nearest 0,1 °C. 6.2 Certified and calibrated thermometer or Pt100 element, with a temperature range up to 150 °C, graduated in 0,1 °C. 6.3 Measuring pipettes and/or measuring cylinders. 6.4 Oven, adjustable to a temperature up to (150 ± 3) °C. 6.5 Connecting hoses, flexible and made of inert material [polytetrafluoroethylene (PTFE) or silicone]. 6.6 Molecular sieve, with moisture indicator, pore size 0,3 nm, dried in an oven set at 150 °C and cooled down to room temperature in a desiccator before use. 6.7 Balance, capable of weighing with an accuracy of ± 0,1 g or less. 7 Sampling Unless otherwise specified, sampling shall be conducted according to EN ISO 3170 or EN ISO 3171 and/or in accordance with the requirements of national standards or regulations for the sampling. It is important that the laboratory receives a sample which is truly representative and has not been damaged or changed during transport and storage. Store the sample in the dark at about 4 °C and measure it as soon as possible after receipt.BS EN 14112  pdf download.