GB/T 3884.19-2017Methods for chemical analysis of copper concentrates - Part 19: Determination of thallium content - Inductively coupled plasma mass spectrometry (English PDF)

3.1

Hydrochloric acid (p = 1.19 g/mL).

3.2

Nitric acid (p = 1.42 g/mL).

Hydrofluoric acid (rho = 1.13 g/mL).

3.4

Perchloric acid (rho = 1.68g/mL).

3.5 hydrochloric acid mixed acid (3

1).

Nitric acid (1 1).

3.7

Thallium standard stock solution Weigh 0.2795g thallium trioxide (wTl2O3 >= 99.99%) placed in a.200mL beaker, covered with a watch glass,

Slowly add 25mL nitric acid (3.6) dissolved, get rid of nitrogen oxides, remove the cooling to room temperature, wash the watch glass and the wall with water, into

250mL volumetric flask, diluted with water to the mark, mix well. 1mL of this solution contains 1mg thallium.

3.8

thallium standard solution A. Pipette Thallium standard stock solution (3.7), by stepwise dilution method, adding 3mL nitric acid (3.2), diluted with water

To the mark, mix well. The final solution 1 mL contains 1 µg of thallium.

3.9 thallium standard solution B

Pipette thallium standard solution A (3.8), by gradual dilution, add 3mL of nitric acid (3.2), diluted with water to

Scale, mix well. The final solution 1 mL contains 10 ng thallium.

3.10

iridium standard stock solution Weigh 0.1000g iridium powder (wIr >= 99.99%), placed in 50mL glass tube, was added 8mL hydrochloric acid (3.1), 2mL hydrogen peroxide, sealing tube. Dissolved at 150 °C 48h, cooling, open tube. Pipette the test solution into 100mL volumetric flask,

Add 10mL hydrochloric acid (3.1), diluted with water to the mark, mix well. 1 mL of this solution contains 1 mg iridium.

3.11 iridium standard solution

Draw iridium standard stock solution (3.10), by gradual dilution, adding 3mL of nitric acid (3.2), diluted with water

To the mark, mix well. The final solution 1 mL contains 10 ng iridium.

3.12

Argon (wAr >= 99.99%).