Why is baseline calibration necessary for silicate analyzers?
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Since silicate analyzers have zero-point calibration, why is baseline calibration still necessary?
Because during the determination of silicate, all solutions of reagents prepared, as well as the containers and utensils used, may have a background level of silicate. Since silicate is an extremely weak anion, it is very difficult to remove it completely during water purification, and the background blank value may vary from time to time; therefore, some manufacturers of pre-made reagents include the reagent blank value labeled with the batch number in the reagent kit. If the reagents are prepared manually, it is necessary to subtract the reagent blank during the measurement in order to perform an actual zero-point correction of the standard curve.
It is mainly to eliminate the impact of reagents on the instrument
So what are the conceptual and physical differences between the two?
Your question is too complex; I am unable to understand it accurately. I'm sorry.
I’m sorry for not making myself clear; what I mean is the difference between baseline calibration and zero-point calibration during curve calibration.