BS ISO 13605:2018 pdf free.Solid mineral fuels – Major and minor elements in coal ash and coke ash – Wavelength dispersive x-ray fluorescence spectrometric method. Discs may be prepared by the casting or press-quenching technique. Both methods will produce glass discs of adequate quality. If the casting technique is used, the sample may be fused with the flux in a crucible and then poured into a separate mould; if an appropriately shaped crucible is used, the fusion may be carried out and the glass allowed to cool in the same crucible. A conventional electric furnace, high-frequency furnace, or gas burner may be used for heating. Disc-making machines are available commercially, and these may be used to fuse and cast the discs. Prior to measurement, discs shall be inspected visually, paying particular attention to the analytical surface. The discs shall not contain undissolved material, and shall be whole and free from crystallization and bubbles. Defective discs shall be re-fused or discarded and substitute discs prepared. Laboratory-prepared ashes for XRF analysis should be freshly prepared; if not, It will be necessary to reheat these to the ashing temperature and hold for 15 mm at this temperature prior to preparation of the XRF…

ISO 11723:2016 pdf free download.Solid mineral fuels Determination of arsenic and selenium Eschka’s mixture and hydride generation method Combustibles minéraux solides — Dosage de l’arsenic et du sélénium— Mélange d’Eschka et méthode par production d’hydrure. 5.4 Potassium iodide solution, 500 g/l. Dissolve 50 g of analytical reagent (AR) grade Kl in distilled water and adjust the volume to 100 ml (for determination of As). 5.5 Sodium borohydride solution. Weigh 1,50 g of sodium borohydride (NaBH4) and 0,4 g of sodium hydroxide (NaOH) into a plastic bottle of 125 ml capacity and add 100 ml of distilled water. Prepare freshly on the day of use. Alternatively, commercially available pressed pellets of sodium borohydride may be used. 5.6 Arsenic stock solution (100 mg/i). Dissolve 0,132 0 g ± 0,000 5 g of arsenic trioxide (As203 of 99,9 % purity, dried at 110 °C for 1 h) in 25 ml of 20 % KOH solution. Add approximately 50 ml of water and 20 ml of hydrochloric acid (52). Adjust the volume with water to 1 litre in a volumetric flask. Alternatively, dissolve 0,416 5 g ± 0,000 5 g of sodium arsenate (Na2HAsO4.7H20) in approximately 100 ml of water. Add 10 ml of…