ChemLab: Techniques



Flasks, Beakers, & Graduated Cylinders



Volumetric Flasks


Analytical Balance

pH Meter: Analog

pH Meter: Digital

Spectrometer: Analog

Spectrometer: Digital

Spectrometer: Scanning

Top-loading Balance




Quantitative Transfer


Vacuum Filtration

ChemLab Home

Digital Spectrometer

A digital spectrometer measures the amount of visible light absorbed by a colored solution. This can be read as Absorbance or % Transmittance.

Setting Up the Spectrometer

First, check that the instrument is turned on. You will hear the fan and see light coming out of the right side of the instrument.

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Next press the A/T/C button to select Absorbance mode. The current mode appears on the display.
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Set the wavelength to the desired value using the nm and nm buttons. The wavelength is displayed on the LCD.
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Fill a curet with your blank solvent and dry the outside of the cuvet carefully.
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Insert your blank cuvet in the sample compartment and close the cover.
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Press 0 ABS/100% T to set the absorbance of the blank to zero.
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After a few moments the absorbance and wavelength will be displayed. The absorbance should be zero.
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Remove the blank and insert a dry sample cuvet.
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The absorbance value of the sample will now be shown on the LCD.
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