ISO 10203:2015 pdf free

ISO 10203:2015 pdf free.Iron ores – Determination of calcium – Flame atomic absorption spectrometric method
Dissolve 5,0 g pure iron (4.7) in 50 ml of hydrochloric acid (4.2) and oxidize by adding nitric acid (4.4) drop by drop. Evaporate until a syrupy consistency is obtained. Add 20 ml of hydrochloric acid (4.2) and dilute to 200 ml with water. Dissolve 17 g of sodium carbonate (4.1) in water, add carefully to the iron solution, and heat to remove carbon dioxide. Transfer the cooled solution to a 1 000 ml one-mark volumetric flask, dilute to volume with water, and mix.
Dissolve 50 g of lanthanum chloride (LaCl3-7H2O) [of mass fraction of calcium less than 0,002 %] in 50 ml of hydrochloric acid (4.2) and 300 ml of hot water. Cool and dilute to 11.
Dissolve 1,248 7 g of dried calcium carbonate (CaCO3) [minimum purity 99,9 % (mass fraction), dried at 105 °Cfor 1 h] in 100 ml of hydrochloric acid (4.2), diluted 1 + 3. When dissolved, cool, transfer to a 1 000 ml one-mark volumetric flask, dilute to volume with water, and mix. Transfer 10 ml of this solution to a 200 ml one-mark volumetric flask, dilute to volume with water, and mix.
Using pipettes, transfer 2,0 ml, 5,0 ml, 10,0 ml, 15,0 ml, and 20,0 ml portions of the calcium standard solutions (4.10) to 200 ml volumetric flasks (see next paragraph). Add 6 ml of hydrochloric acid (4.2), 60 ml of background solution (4.8), and 40 ml of lanthanum chloride solution (4.9) to each flask. Dilute all the solutions to volume with water and mix. Prepare a zero calcium calibration solution by transferring 60 ml of the background solution to a 200 ml volumetric flask. Then add 6 ml of hydrochloric acid (4.2) and 40 ml of lanthanum chloride solution (4.9). Dilute all the solutions to volume with water and mix.
Ordinary laboratory apparatus, including one-mark pipettes and one-mark volumetric flasks complying with the specifications of ISO 648 and ISO 1042, respectively, and the following.
All glassware, volumetric flask lids, and the platinum crucibles shall first be washed in hydrochloric acid (diluted 1 + 1) and then in water.ISO 10203 pdf download.