GB/T 23273.2-2009Methods for chemical analysis of cobalt oxalate - Part 2: Determination of lead content - Electrothermal atomic absorption spectrometry (English PDF)

1 Scope

GB/T 23273 provisions of this part of the determination of the amount of lead in cobalt oxalate.

This section applies to the determination of lead content of cobalt oxalate. Measurement range. 0.001% to 0.01%.

2 Method summary

Sample decomposition with nitric acid, in dilute nitric acid medium, graphite furnace atomic absorption spectrometer at a wavelength of 283.3nm, Zeeman effect deduction back

King, measuring the absorption peak area, according to the standard curve matching cobalt matrix calculations lead content.

3 Reagents

Analysis of water are two of water or equivalent purity. After dilute nitric acid used in the experiment containers are treated with hot, clean water.

4 Instrument

Atomic absorption spectrometer with graphite furnace atomizer with Zeeman effect background subtraction function, autosampler, with the female lead in hollow

Pole lamp.

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

--- Sensitivity. basically the same test solution and measurement solution, characteristic mass of lead should be less than 50pg.

--- 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%;

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

0.5% of the mean absorbance of the standard solution.

--- 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 0.70.