GB/T 6609.1-2018 in English

1. Standard Overview

Inductively coupled plasma atomic emission spectrometry (ICP-AES) is an authoritative method for determining trace elements in alumina and is widely used in the fields of metallurgy and materials science. This standard is applicable to the detection of a variety of elements in alumina, including sodium, potassium, iron, copper, magnesium, calcium, zinc, vanadium, titanium, gallium, manganese, lithium, beryllium, chromium, boron, etc.

2. Technical Interpretation

This method dissolves the sample and introduces it into the ICP spectrometer, using argon plasma to excite the elements in the test solution and detect the intensity of its characteristic spectral lines. The key steps include:

• Sample pretreatment: acid dissolution using a polytetrafluoroethylene sealed sample dissolver or a microwave digestion system.
• Matrix matching method correction: eliminate the interference of matrix elements on the determination.
• Working curve drawing: use standard solutions to establish concentration-intensity relationships.

3. Comparison of operation steps

4. Precision analysis

The specific values of repeatability limit (r) and allowable difference can be determined by linear interpolation to ensure data reliability. For example:

• When the mass fraction is 0.01%, the repeatability limit is 0.001%
• When the mass fraction is 0.5%, the allowable difference is 0.025%

5. Implementation suggestions

In practical applications:

1. Preferably choose a microwave digestion system to improve dissolution efficiency.
2. Regularly calibrate the instrument to ensure the accuracy of the working curve.
3. Use standard samples for quality control.