GB/T 3253.3-2008Methods for chemical analysis of antimony and antimony trioxide - Determination of lead content - Flame atomic absorption spectrometric method (English PDF)

Foreword

GB/T 3253 "Methods for chemical analysis of antimony and antimony trioxide," a total of 11 parts.

--- GB/T 3253.1 chemical analysis of antimony trioxide and arsenic content of molybdenum blue spectrophotometric determination of arsenic --- GB /antimony trioxide and chemical analysis of iron content measured T 3253.2 phenanthroline spectrophotometry --- GB/T 3253.3 antimony trioxide and chemical analysis of lead content - Flame Atomic Absorption Spectrometry --- Determination of GB/T 3253.4 antimony trioxide and sulfur content of chemical analysis methods --- GB/T 3253.5 antimony trioxide and chemical analysis of copper content - Flame Atomic Absorption Spectrometry --- GB/T 3253.6 and antimony trioxide of selenium content - Atomic Fluorescence Spectrometry --- GB T 3253.7 antimony trioxide and chemical analysis methods Determination of bismuth content / --- Determination of GB/T 3253.8 antimony trioxide and antimony trioxide amount of chemical analysis methods --- Determination of GB/T 3253.9 antimony trioxide and chemical analysis of cadmium content --- Determination of GB/T 3253.10 antimony trioxide and chemical analysis of mercury content Determination --- GB/T 3253.11 antimony trioxide and analysis of lead, copper, bismuth, cadmium, iron, selenium, chromium, arsenic, mercury, tin content This is Part 3:

This Part replaces GB/T 3253.3-2001 "Methods for chemical analysis of lead, antimony, copper content determination" (lead part), GB/T 3254.3-1998 "Methods for chemical analysis of antimony trioxide determination of lead content." Compared with GB/T 3253.3-2001, GB/T 3254.3-1998, This section has the following changes.

--- Canceled dithizone spectrophotometry, atomic absorption spectrometry retention;

--- Detection limit extends from 0.010% to 0.0020%;

--- Complements the precision and quality assurance and control provisions.

1 Scope

This section provides the determination of antimony and antimony trioxide in lead content.

This section applies to the determination of lead content of antimony and antimony trioxide in. Measurement range. 0.0020% to 0.75%.

2 Method summary

Sample with nitric acid or hydrochloric acid and hydrobromic acid dissolved and evaporated to dryness, repeat adding hydrobromide volatile except antimony. In dilute hydrochloric acid medium, using air - B Alkyne flame atomic absorption spectrometer wavelength 283.3nm measured absorbance of lead, antimony trioxide and other impurities do not interfere Determination.

3 Reagents

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 Ratio of not less than 0.8.

Atomic absorption spectrometer reference operating conditions.

--- Wavelength 283.3nm;