Traditional Culture Encyclopedia - Traditional festivals - Why lead standard solution appears negative value by graphite furnace atomic absorption spectrometry.
Why lead standard solution appears negative value by graphite furnace atomic absorption spectrometry.
Possible reasons:
1, the blank absorption value of the sample is too high, and the standard solution will be negative if it is reduced with low concentration standard solution.
2. During the heating process, the ashing temperature is too high, which leads to most lead loss in the ashing stage, and the value is either unstable or negative.
Send the brand model and temperature rise curve of the instrument.
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