BS ISO 6101-4:2014 pdf free

BS ISO 6101-4:2014 pdf free.Rubber – Determination of metal content by atomic absorption spectrometry
After ashing, allow the crucible and its contents to cool to ambient temperature. Add 20 cm3 of concentrated hydrochloric acid (4.1). Heat the mixture on the steam bath (5.9) for at least 10 min.Do not let the reaction mixture boil. Allow to cool to ambient temperature and transfer the solution quantitatively, with the aid of water, to a 50 cm3 one-mark volumetric flask (5.5). If the ash is not totally dissolved, proceed as follows.
Transfer the solution and the undissolved ash quantitatively, with the aid of water, to a platinum crucible (5.10). Add a few drops of concentrated sulfuric acid (4.3) and 5 cm3 of hydrofluoric acid (4.5). Heat on the electric hotplate or heated sand bath (5.8) in a fume cupboard and evaporate until dry while stirring with a platinum rod (5.10). Repeat this digestion with the same quantities of sulfuric and hydrofluoric acids two more times.
Allow to cool to ambient temperature, add 20 cm3 of concentrated hydrochloric acid (4.1), heat for 10 min and transfer quantitatively, with the aid of water, to a 50 cm3 one-mark volumetric flask (5.5).
Dilute to the mark with water and mix thoroughly. Insoluble matter might settle and, if so, shall be filtered off using a filter crucible (5.4) just before making spectrometric measurements in accordance with 7.3.
Test solutions should contain approximately 12 % hydrochloric acid. If evaporation, etc., has reduced or increased this concentration, adjust accordingly with concentrated hydrochloric acid (4.1) or water.
Dissolution of inorganic residue using nitric acid – Alternative method
Add 10 cm3 of dilute nitric acid (4.7) to the cooled residue. Cover with a watch glass and heat on a steam bath (5.9) for at least 30 min. Allow to cool to ambient temperature. Filter the contents of the crucible into a 50 cm3 one-mark volumetric flask, rinsing the crucible and making up to the mark with dilute
nitric acid (4.7).
Into a series of five 100 cm3 one-mark volumetric flasks (5.5), introduce using pipettes (5.6) the volumes of standard manganese solution (4.9) indicated in Table 1. Dilute to the mark with 1 + 2 hydrochloric acid (4.2) or dilute nitric acid (4.7) and mix thoroughly.BS ISO 6101-4 pdf download.