BS ISO 5647:2019 pdf free

BS ISO 5647:2019 pdf free.Paper and board – Determination of titanium dioxide content
Transfer the ash to a 250 ml glass beaker. Add 4 g of ammonium sulphate (5.3) and 10 ml of the sulphuric acid (5.2). Mix well and cover the beaker with a watch glass. Heat in a fume hood until fumes of sulphur trioxide are evolved and continue heating for 30 min. Allow the solution to cool to room temperature and then carefully add it, drop by drop, to about 50 ml of water contained in another beaker.
Allow the solution to cool and decant it into a 100 ml volumetric flask. Rinse both beakers with water and add the rinsings to the flask. Finally, make up to the mark with water and mix well.
Into one of a series of six 50 ml volumetric flasks, place 25,0 ml of the reagent blank solution (Clause 9).Into the remaining five 50 ml volumetric flasks, transfer the quantities of the standard titanium dioxide solution (5.5), shown in Table 1. To each flask, add 7,5 ml of the hydrogen peroxide solution (5.6), and make up to the mark with the diluted sulphuric acid (5.4), and mix well.
Into one of a series of five 50 ml volumetric flasks, place 25,0 ml of the reagent blank solution (Clause 9) and add 2,5 ml of the potassium chloride solution (5.7). Into the remaining four 50 ml volumetric flasks,transfer 2,5 ml of the potassium chloride solution (5.7) and add the quantities of the standard titanium dioxide solution (5.5) shown in Table 2. For each flask, make up to the mark with the diluted sulphuric acid (5.4), and mix well.
Carry out a reagent blank determination (Table 2, term 0) following the same mode of operation and utilizing the same quantities of reagent specified in 11.1.1 but omitting the standard titanium solution (5.5). Aspirate this solution into the flame and adjust the instrument to zero absorbance against the reagent blank test solution.
Aspirate the series of titanium calibration solutions (11.1.1) in succession into the flame and measure the absorbance for each. Take care to keep the aspiration rate constant throughout the preparation of the calibration graph. Spray water through the burner after each measurement.BS ISO 5647 pdf free download.