ISO 19976-2:2019 pdf free.Copper, lead and zinc sulfide concentrates – Determination of cadmium -Acid digestion and inductively coupled plasma atomic emission spectrometric method.
3 Terms and definitions
No terms and definitions are listed in this document.
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4 Principle
The test sample is dissolved in hydrochloric acid, nitric acid and hydrofluoric acid with a final stage perchioric 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.
5 Reagents
During the analysis, use only reagents of recognized analytical grade and distilled water or water of equivalent purity.
5.1 Hydrochloric acid, concentrated (p2 1,19 g/rnl).
5.2 Hydrochloric acid, dilute 1+1. Slowly add 500 ml of concentrated hydrochloric acid (5.1) to
500 ml of water while stirring.
5.3 Hydrochloric acid, dilute 1+9. Slowly add 50 ml of concentrated hydrochloric acid (&1) to 450 ml of water white stirring.
5.4 Nitric acid, concentrated (P20 142 g/rnI).
5.5 Hydrofluoric acid, concentrated (P20 1,15 g/ml).
5.6 Perchloric acid, concentrated (P20 1,70 g/ml).
5.7 Cadmium metal, minimum purity 99,99 %.
5.8 Cadmium, standard solution, 1 ml contains 1 rng of Cd.
Weigh, to the nearest 0,1 mg, 1,000 0 g of cadmium metal (51) into a 250 ml beaker. Add 10 ml of water and 5 ml of nitric acid (5A). Cover and warm gently (if necessary) until the cadmium metal Is dissolved. [teat 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 tip exactly to the mark with water and mix again.
5.9 Cadmium, standard solution, 1 ml contains 100 ig of Cd.
Pipette 1000 ml of cadmium standard solution (5L8) into a 100 ml one-mark volumetric flask. Add 20 ml of hydrochloric acid (&Z). 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.
5.10 Cadmium, standard solution, 1 ml contains 10 pig of Cd.
Pipette 10,00 ml of cadmium standard solution (5,9) into a 100 ml one-mark volumetric flask. Add 18 ml of hydrochloric acid (52), 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.
5.11 Yttrium standard solution, 1 ml contains 1 rngofY.
Weigh, to the nearest 0,1 mg, 1,269 9 g of yttrium trioxide (99,99 %) and transfer to a 250 ml beaker. Add 100 ml of hydrochloric acid (53) 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 (53) and mix again.
5.12 Yttrium, standard solution, 1 ml contains 200 pig of Y.
Pipette 50,00 ml of yttrium standard solution (5.d1) into a 250 ml one-mark volumetric flask. Add 40 ml of hydrochloric acid (52). 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.
6 Apparatus
Ordinary laboratory equipment and the following.
6.1 Volumetric glassware, of class A conforming with ISO 385, Iso 648 and ISO 1042, and used in accordance with ISO 4787.ISO 19976-2 pdf download.