GB/T 4325.1-2013Methods for chemical analysis of molybdenum - Part 1: Determination of lead content - Graphite furnace atomic absorption spectrometry (English PDF)

1 Scope

GB/T 4325 This section specifies the method for determination of molybdenum in lead content.

This section applies to molybdenum trioxide, ammonium molybdate, molybdenum powder, molybdenum bar of lead contents. Measurement range. 0.0001% to 0.0100%.

2 Method summary

Sample was dissolved hydrogen peroxide. In nitric acid medium with argon as a protective gas, graphite furnace atomic absorption spectrometer wavelength 283.3nm

Lead measured absorbance.

3 Reagents

Unless otherwise indicated, this part of water as a secondary water or water for more than two. The reagents were used pure class distinctions.

4 Instrument

Graphite furnace 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. the test solution and measurement matrix consistent solution, characteristic concentration of lead should be less than 1.6ng/mL;

--- Precision. measure up to 10 times the standard solution, the absorbance of the standard deviation should not exceed 0.8% of the mean absorbance; 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 concentration standard

The average absorbance of standard solution of 0.4%;

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

Ratio of not less than 0.7.