ISO 19976-2:2019 pdf free
ISO 19976-2:2019 pdf free.Copper, lead and zinc sulfide concentrates一Determination of cadmium
The test sample is dissolved in hydrochloric acid, nitric acid and hydrofluoric acid with a final stage perchloric acid digestion. Yttrium is added as an internal standard to solutions of dissolved samples,reference materials and calibration solutions and cadmium determined by ICP-AES.
Weigh, to the nearest 0,1 mg, 1,000 0 g of cadmium metal (5.7) into a 250 ml beaker. Add 10 ml of water and 5 ml of nitric acid (5.4). Cover and warm gently (if necessary) until the cadmium metal is dissolved.Heat to remove nitrogen oxides, then allow to cool, and add about 50 ml of water. Transfer the solution to a 1 000 ml one-mark volumetric flask, add 40 ml of hydrochloric acid (5.2), fill up nearly to the mark with water, mix and cool to room temperature. Then fill up exactly to the mark with water and mix again. Pipette 10,00 ml of cadmium standard solution (5.9) into a 100 ml one-mark volumetric flask. Add 18 ml of hydrochloric acid (5.2), fill up nearly to the mark with water, mix and cool to room temperature.Then fill up exactly to the mark with water and mix again.
Weigh, to the nearest 0,1 mg, 1,269 9 g of yttrium trioxide (299,99 %) and transfer to a 250 ml beaker. Add 100 ml of hydrochloric acid (5.3) and heat gently until the metal is dissolved, then cool to room temperature. Transfer to a 1 000 ml one-mark volumetric flask, fill up nearly to the mark with hydrochloric acid (5.3), mix and cool to room temperature, then fill up exactly to the mark with hydrochloric acid (5.3) and mix again.
Pipette 50,00 ml of yttrium standard solution (5.11) into a 250 ml one-mark volumetric flask. Add 40 ml of hydrochloric acid (5.2), fill up nearly to the mark with water, mix and cool to room temperature, then fill up exactly to the mark with water and mix again.ISO 19976-2 pdf free download.
