If wet beakers are used, a systematic error is introduced and the calibration curve for the determination will be inaccurate.
Spectrophotometry is a method of analysis that depends on the interaction of light with matter. Usually, the absorbance of light depends on the concentration of the sample.
In order to use the spectrophotometric method, a calibration curve is first prepared and used to determine the concentration of the unknown sample. A dry beaker should be used to avoid dilution of the standard solutions used for calibration. If they are diluted, a systematic error is introduced and the calibration curve for the determination will be inaccurate.
The slope of the of this experiment is a measure of sensitivity and a wet beaker will give the false impression of low sensitivity.
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