BS ISO 7530-1:2015 pdf download – Nickel alloys — Flame atomic absorption spectrometric analysis Part 1 : Determination of cobalt, chromium, copper, iron and manganese

BS ISO 7530-1:2015 pdf download – Nickel alloys — Flame atomic absorption spectrometric analysis Part 1 : Determination of cobalt, chromium, copper, iron and manganese 4.12 Copper standard solution, 1,000 g/l. Weigh 1 g ± 0,001 g of copper (Cu ≥ 99,9 %) and transfer it into a 400 ml beaker. Add 50 ml of nitric acid (4.2), cover with a watch glass, and allow to stand until the reaction ceases. Heat to complete dissolution, boil to remove nitrogen oxides, and evaporate just to dryness. Cool, add 25 ml of hydrochloric acid (4.3), and evaporate just to dryness. Add again 25 ml of hydrochloric acid (4.3) and repeat the evaporation. Dissolve the salts in 50 ml of hydrochloric acid (4.4) and heat if necessary. Cool, transfer into a 1 000 ml one-mark volumetric flask, dilute to the mark with water, and mix well. 1 ml of this solution contains 1,000 mg of copper. 4.13 Copper standard solution, 0,100 g/l. Transfer 10,0 ml of copper standard solution (4.12) into a 100 ml one-mark volumetric flask and add 5 ml of hydrochloric acid (4.3). Dilute to the mark with water and mix well. Prepare this solution immediately prior to use. 1 ml of this solution contains 0,100 mg of copper. 4.14 Copper standard solution, 0,025 g/l. Transfer 5,0 ml of copper standard solution (4.12) into a 200 ml one-mark volumetric flask and add 10 ml of hydrochloric acid (4.3). Dilute to the mark with water and mix well. Prepare this solution immediately prior to use. 1 ml of this solution contains 0,025 mg of copper. 4.15 Iron standard solution, 1,000 g/l. Weigh 1 g ± 0,001 g of iron (Fe ≥ 99,9 %) and transfer it into a 400 ml beaker. Add 30 ml of hydrochloric acid (4.4) and cover with a watch glass. Heat to initiate the reaction and complete dissolution. Cool to about 50 °C, cautiously add 1 ml of hydrogen peroxide (4.7), and bring to the boil to oxidize the iron. Cool,transfer into a 1 000 ml one-mark volumetric flask, and add 35 ml of hydrochloric acid (4.3). Dilute to the mark with water and mix well. 1 ml of this solution contains 1,000 mg of iron. 4.16 Iron standard solution, 0,050 g/l. Transfer 10,0 ml of iron standard solution (4.15) into a 200 ml one-mark volumetric flask and add 10 ml of hydrochloric acid (4.3). Dilute to the...