YS/T 239.7-2010Methods for chemical analysis of antimony trisulfide. Part 7: Determination of lead content. Flame atomic absorption spectrometric method (English PDF)

Foreword

YS/T 239 "Methods for chemical analysis of antimony trisulfide" There are seven sections.

--- Part 1. Determination of antimony content cerium sulfate titration;

--- Part 2. Determination of the amount of sulfur compounds and combustion titration method;

--- Part 3. Determination of free sulfur content and combustion titration method;

--- Part 4. aqua regia insolubles - Gravimetric method;

--- Part 5. Determination of arsenic content of arsenic molybdenum blue spectrophotometric method;

--- Part 6. Determination of iron content of phenanthroline spectrophotometry;

--- Part 7. Determination of lead content by flame atomic absorption spectrometry.

This is Part 7.

This section is in accordance with GB/T 1.1-2009 given rules drafted.

Division into new parts.

This standard by the national non-ferrous metals Standardization Technical Committee (SAC/TC243) centralized.

1 Scope

This section YS/T 239 provides for antimony trisulfide determination of lead content.

This section applies to the determination of the amount of lead antimony trisulfide. Measurement range. 0.0020% mass fraction of Pb to 0.050%.

2 Method summary

Sample dissolution with hydrochloric acid and nitric acid evaporated, the repetitive addition hydrobromide volatile antimony. In dilute hydrochloric acid medium, using air - acetylene flame at Atomic absorption spectrometer wavelength 283.3nm measured absorbance lead.

3 Reagents

Unless otherwise indicated, the reagents used in this section refer to water and recognized analytical reagent and tertiary water.

3.1 hydrochloride (rho1.19g/mL).

Nitrate 3.2 (rho1.42g/mL).

3.3 hydrobromide (rho1.50g/mL).

3.4 hydrochloride (11).

3.5 nitric acid (11).

4 Instrument

Atomic absorption spectrometer, with a lead hollow cathode lamp.

Under optimum working conditions for those who can reach the following indicators can be used.

--- Characteristic concentration. a solution in the measurement matrix consistent solution, characterized in lead concentration should not exceed 0.20µg/mL.

--- Precision. standard solution with the highest concentration of 10 times the absorbance measurements, the standard deviation should not exceed the average absorbance of 1.0%;

With the lowest concentration of standard solution (not "zero" concentration of the standard) measuring the absorbance of 10 times, the standard deviation should not exceed the maximum 0.5% concentration of the standard average absorbance.

--- Linear curve. The curve is divided into five sections according to concentration, absorbance difference between the absorbance difference between the highest and the lowest segment of the segment