GB/T 5121.18-2008Methods for chemical analysis of copper and copper alloys - Part 18:Determination of magnesium content (English PDF)

1 Scope

This section specifies the determination of copper and copper alloy magnesium content.

This section applies to the determination of copper and copper alloy magnesium content. Measurement range. 0.015% to 1.00%.

2 Method summary

The sample is dissolved in nitric acid and hydrofluoric acid. In nitric acid medium, using air - acetylene flame atomic absorption spectrometer wavelength 285.2nm

Measured absorbance magnesium. Silicon, aluminum, titanium and beryllium interference, adding strontium nitrate eliminate; other coexisting elements copper, nickel, lead and zinc do not interfere

Determination.

3 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.

4 Instrument

Atomic absorption spectrometer, with a magnesium hollow cathode lamp.

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

--- Sensitivity. consistent with the measurement solution matrix solution features magnesium concentration should not exceed 0.01µg/mL;

--- Precision. measuring the absorbance of the standard solution 10 times the highest concentration, the standard deviation does not exceed 1.0% of the mean absorbance; with

The lowest concentration standard solution (not a "zero" standard solution) absorbance measured 10 times, and the standard deviation should not exceed the maximum standard solution

0.5% was the average absorbance;

--- 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 should not be less than 0.7.

5 Sample

Thickness of less than 1mm debris.

Step 6 Analysis