UV-Vis spectroscopy is a powerful analytical technique that has diverse applications in various fields. However, when choosing a spectrophotometer, it is important to understand the differences between colorimetric and analytical models.
Colorimetric spectrophotometers are designed for simple absorbance measurements to determine concentration based on a single wavelength. They have specifications suited for basic quality control applications but lack capabilities for advanced analysis.
On the other hand, analytical UV-Vis spectrophotometers are high-performance research grade instruments ideal for applications requiring high resolution absorbance spectra and quantification of multiple analytes simultaneously. They offer specifications and features beyond the scope of colorimeters.
Key Differences
Wavelength range: Colorimeters typically have a narrow fixed wavelength, while analytical spectrophotometers can scan a broad range from UV to NIR.
Resolution: Colorimeters provide low resolution spectra insufficient for complex samples. Analytical instruments have high optical resolution for separation of overlapping absorption bands.
Signal-to-noise ratio: Due to their enhanced optical design, analytical spectrophotometers achieve a lower detection limit and better signal-to-noise performance.
Measurement time: A full spectrum from an analytical spectrophotometer takes seconds whereas colorimeters only measure at one wavelength which is faster.
Applications
Colorimeters are well suited for low complexity qualitative and quantitative QC methods like dissolved oxygen, chemical oxygen demand and pH. They are used extensively in food, water treatment and medical testing.
Analytical spectrophotometers are highly recommended for applications requiring identification of components, kinetics studies and quantification of multiple analytes simultaneously as in pharmaceuticals, biotechnology, polymers and academic research.
Drawellanalytical offers a wide selection of colorimeters and high performance split beam UV visible spectrophotometers to suits varied analysis needs.
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