Plastics Technology Laboratories  

Ultra-Violet/Visible (UV/VIS) Spectrophotometry

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UV/VIS Spectrophotometry is used to determine the absorption or transmission of UV/VIS light (180 to 820 nm) by a sample. It can also be used to measure concentrations of absorbing materials based on developed calibration curves of the material.

Test Procedure:
A sample is placed in the UV/VIS beam and a graph of the transmittance or absorbance versus the wavelength is obtained.

Alternatively, samples are prepared in known concentrations and their absorbance is read by the UV/VIS Spectrophotometer. Results are then graphed to make a calibration curve from which the unknown concentration can be determined by its absorbance.

Specimen size:
Transparent plastics or films.
Solutions of transparent solids.

A spectrum of percent transmittance or absorbance versus wavelength.
The concentration can be found by mathematical methods based on Beer’s Law

Equipment Used:
Hewlett Packard Diode Array UV/VIS Spectrophotometer

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**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. For more information please contact a Intertek PTL Technical Representative at . Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.

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