GB/T 4103.8-2012Methods for chemical analysis of lead and lead alloys - Part 8: Determination of tellurium content (English PDF)

3.1

Unless otherwise stated, the use of analytical reagent only recognized in the analysis; the water is distilled or deionized water or equivalent purity,

Shall comply with the provisions of GB/T 6682's.

3.2

instruments shall be within the test cycle, the performance indicators should meet the technical parameters required for verification; glass containers GB/T 12808,

GB/T 12809, GB/T 12806 specified in Class A, with reference to the specific use requirements GB/T 12810 in.

4 a method of hydride generation - atomic fluorescence spectrometry

4.1 Determination of Range

This method is suitable for lead ingots, lead-calcium alloy in the determination of tellurium content was measured in the range of 0.0005% to 0.0050% (mass fraction).

4.2 Principle

Sample with nitric acid - tartaric acid dissolved lead to form lead sulfate precipitate in hydrochloric acid and tellurium separation medium, tellurium is reduced to potassium borohydride tellurium.

Hydride with argon gas into the quartz furnace atomizer, the fluorescence intensity was measured tellurium in atomic fluorescence spectroscopy.

4.3 Reagents

4.3.1

tartaric acid, pure class distinctions.

4.3.2

nitrate (rho1.42g/mL), pure class distinctions.

4.3.3

hydrochloric acid (rho1.19g/mL), pure class distinctions.

4.3.4

sulfuric acid (rho1.84g/mL), pure class distinctions.