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Problem with calibration curve
When performing analysis of alkali and alkaline earth metals, I can't get my calibration curve. The reason is that absorbance of my blank solution is much higher than absorbance of my standard solution (absorbance of standards get negative values).
I don't have this problem when performing analysis of transition metals, only alkali and alkaline earth metals.
I would like to ask if anybody ever had similar problem and how can I solve it.
I use PerkinElmer Atomic Spectroscopy standards and as a blank solution I use 1% nitric acid.