1.How does sample matrix matching affect detection accuracy?
If the standard substance used to calibrate the instrument has a significantly different chemical composition and metallurgical process from the cold-rolled coil being tested, systematic errors will be introduced.
Core factor. Matrix mismatch is one of the most common causes of inaccurate results.
2.How do instrument standardization conditions affect detection accuracy?
The parameters of the instrument, such as the excitation source, optical path, and detector, need to be optimized for different types of samples (such as ultra-low carbon steel).
Important factors. Inappropriate parameters can directly affect the accuracy and stability of the analysis.
3.How does the range of sample content affect the accuracy of detection?
For the determination of elements with extremely low content (such as carbon content in the range of 0.002% to 0.03%), the relative standard deviation of the results may be large (minimum 2% and maximum 21%), but the fluctuation range of the absolute error is very small (approximately ±0.0001%).
Precision fluctuations. The lower the content, the greater the relative fluctuation of the results may be, but the absolute error is still within a controllable range.
4.How do sample condition and preparation affect detection accuracy?
The surface of cold-rolled steel sheets may contain oxide layers, oil stains, or inclusions. If the sample surface is not prepared smoothly or cleanly, it will interfere with the excitation and collection of spectra.
Basic prerequisites. Improper surface treatment can directly lead to analysis failure or data errors.
5.What are some suggestions for improving the accuracy of testing?
Selecting appropriate reference materials: It is essential to select reference materials that match the matrix of the cold-rolled coil product being tested for instrument calibration. This is the primary prerequisite for ensuring accuracy.
Optimizing instrument conditions: Adjust and optimize the standardized operating conditions of the instrument according to the specific testing task (e.g., determining ultra-low carbon).
Standardizing sample preparation: Ensure that the surface of the sample to be tested is clean, flat, and free of oxide scale and obvious stains.