Chemical analysis methods of rare earth ferrosilicon alloy and rare earth ferrosilicon magnesium alloy - Part 3: Determination of magnesia content - Inductively coupled plasma atomic emission spectrometry
1 Scope
This part of GB/T 16477 specifies the methods for determining the magnesia content of rare earth ferrosilicon alloy and rare earth ferrosilicon magnesium alloy.
This part is applicable to the determination of magnesia content in the rare earth ferrosilicon alloy and rare earth ferrosilicon magnesium alloy, with a measuring range of 0.30%~3.00%.
2 Principle
The test portion shall be leached and separated by potassium dichromate solution, and the content of magnesia shall be determined by inductively coupled plasma atomic emission spectrometry in dilute hydrochloric acid medium at the wavelength of 280.270 nm.
3 Reagents and materials
3.1 Hydrochloric acid (1+1).
3.2 Potassium dichromate solution (40 g/L): Weigh 40 g of potassium dichromate, place it in a 250 mL beaker and dissolve it with water, transfer the solution into a 1,000 mL volumetric flask, dilute it to the scale with water and mix it well.
3.3 Magnesia standard stock solution: Weigh 0.2500 g of magnesia (purity > 99.99%) pre-scorched to constant weight at 850°C and cooled to room temperature in a desiccator, place it in a 150 mL beaker, add 10 mL hydrochloric acid (see 3.1) to heat and dissolve, cool to room temperature, transfer the solution to a 250 mL volumetric flask, dilute to the scale with water and mix well. The solution contains 1 mg of magnesia per 1 mL.
3.4 Magnesia standard solution: Pipette 5.00 mL of magnesia standard stock solution (see 3.3) in a 100 mL volumetric flask, add 2 mL of hydrochloric acid (see 3.1), dilute to the scale with water and mix well. This solution contains 50 μg of magnesia per 1 mL.
Chemical analysis methods of rare earth ferrosilicon alloy and rare earth ferrosilicon magnesium alloy - Part 3: Determination of magnesia content - Inductively coupled plasma atomic emission spectrometry
1 Scope
This part of GB/T 16477 specifies the methods for determining the magnesia content of rare earth ferrosilicon alloy and rare earth ferrosilicon magnesium alloy.
This part is applicable to the determination of magnesia content in the rare earth ferrosilicon alloy and rare earth ferrosilicon magnesium alloy, with a measuring range of 0.30%~3.00%.
2 Principle
The test portion shall be leached and separated by potassium dichromate solution, and the content of magnesia shall be determined by inductively coupled plasma atomic emission spectrometry in dilute hydrochloric acid medium at the wavelength of 280.270 nm.
3 Reagents and materials
3.1 Hydrochloric acid (1+1).
3.2 Potassium dichromate solution (40 g/L): Weigh 40 g of potassium dichromate, place it in a 250 mL beaker and dissolve it with water, transfer the solution into a 1,000 mL volumetric flask, dilute it to the scale with water and mix it well.
3.3 Magnesia standard stock solution: Weigh 0.2500 g of magnesia (purity > 99.99%) pre-scorched to constant weight at 850°C and cooled to room temperature in a desiccator, place it in a 150 mL beaker, add 10 mL hydrochloric acid (see 3.1) to heat and dissolve, cool to room temperature, transfer the solution to a 250 mL volumetric flask, dilute to the scale with water and mix well. The solution contains 1 mg of magnesia per 1 mL.
3.4 Magnesia standard solution: Pipette 5.00 mL of magnesia standard stock solution (see 3.3) in a 100 mL volumetric flask, add 2 mL of hydrochloric acid (see 3.1), dilute to the scale with water and mix well. This solution contains 50 μg of magnesia per 1 mL.
4 Instrument
4.1 Full-spectrum direct-reading plasma emission spectrometer with resolution < 0.006 nm (at 200 nm).
4.2 Light source: Argon plasma light source, using power not less than 1.0 kW.
4.3 Oscillator.
Contents of GB/T 16477.3-2010
Foreword i
1 Scope
2 Principle
3 Reagents and materials
4 Instrument
5 Specimen
6 Analytical procedures
7 Calculation and expression of analysis results
8 Precision
9 Quality assurance and control
