GB/T 4103.5-2012Methods for chemical analysis of lead and lead alloys - Part 5: Determination of bismuth content (English PDF)

3.1

Unless otherwise stated in the analysis using only confirmed analytically pure reagents; the distilled or deionized water or equivalent purity water,

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 applicable to the determination of lead, secondary lead and lead-bismuth alloy of bismuth content - Determination of bismuth content in the range of 0.0001% to 0.06% (Mass fraction).

4.2 Principle

The sample is dissolved in nitric acid, thiourea - ascorbic acid in the presence of hydrochloric acid medium, bismuth (III) by potassium borohydride reduction of bismuth hydride,

With argon gas into the quartz furnace atomizer, the fluorescence intensity was measured on a bismuth atomic fluorescence spectrometer.

4.3 Reagents

4.3.1

nitrate (rho1.42g/mL) (excellent pure).

4.3.2

hydrochloric acid (rho1.19g/mL) (excellent pure).

4.3.3

nitric acid (12).