Atomic absorption
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Why does setting the curve value to above 0.99995 not work when using backtesting samples? ? ? ? How to determine whether a standard sample is useful? ? ?
The regression of the standard curve prepared upstairs meets the measurement requirements; what does it mean that the retest standards were not used? If measurements are taken within the range of the standard curve, the results should be close to those of the standard samples; a slight difference is normal. When creating a regression curve, each point is usually measured twice as well. If the reference sample used for backtesting differs significantly from the one used to create the curve, large deviations may occur.
As a supplementary note, if linear regression of the first order is chosen and there are deviations in the measurement of the standard samples, it may be advisable to use a quadratic linear relationship for the standard curve.
I’m not quite clear about the question upstairs; please explain it more clearly so that we can discuss it and improve together.