GB/T 7739.14-2019Methods for chemical analysis of gold concentrates - Part 14: Determination of thallium content - Inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry (English PDF)

2.1 Method summary

The sample is decomposed by hydrochloric acid, nitric acid, hydrofluoric acid and perchloric acid, and is rich in polyurethane foam in the presence of hydrogen peroxide and iron salt in a mixed acid medium.

Set, separate the ruthenium from the impurity element, and desorb it in a boiling water bath with a dilute nitric acid solution, selected by inductively coupled plasma atomic emission spectrometer

Under the conditions, the spectral intensity of the lanthanum element in the test solution was measured at a wavelength of 190.801 nm, and the amount of ruthenium was calculated by a standard curve method.

2.2 Reagents or materials

Analytically pure reagents and secondary deionized water were used in the analysis unless otherwise stated.

2.2.1

Hydrochloric acid (rho = 1.19 g/mL).

2.2.2

Nitric acid (rho = 1.42 g/mL).

2.2.3

Hydrofluoric acid (rho=1.13g/mL).

2.2.4

Perchloric acid (rho = 1.68 g/mL).

2.2.5

Hydrogen peroxide (30%).

2.2.6 Hydrochloric acid solution (1 9)

Mix 1 part hydrochloric acid (2.2.1) with 9 parts of water, and use it now.

2.2.7 Dilute nitric acid solution (1 99)

1 part nitric acid (2.2.2) is mixed with 99 parts of water and is now ready for use.

2.2.8 Mixed acid (1 1)

3 parts of hydrochloric acid (2.2.1), 1 part of nitric acid (2.2.2) and 4 parts of water are mixed and used now.

2.2.9 Ferric chloride solution (50g/L)

Weigh 242.5g FeCl3. 6H2O in a 500mL beaker, add water to dissolve, add

Add 30 mL of mixed acid (2.2.8), transfer to a 1000 mL volumetric flask, dilute to the mark with water, and mix.

(2.2.2) Dilute to the mark with water and mix. 1 mL of this solution contained 50 µg of hydrazine.