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Absorbance and Concentration Measurement
Absorbance links the light a solution takes up to the concentration of what is dissolved in it. Colorimeters work with fixed filters; spectrophotometers select any wavelength across the visible range.
- Spectrophotometers
- 340 – 1020 nm
- Colorimeters
- 400 – 700 nm
- Modes
- %T · Abs · Conc
- Bandwidth
- 2 nm
Instruments
All spectrophotometers →Recommended instruments
Method
How it is measured
01
Select
Choose a filter or set the wavelength where the analyte absorbs most.
02
Zero
Set 100 %T with a blank in the cuvette.
03
Read
Absorbance of the sample gives concentration through a standard or K factor.
Applications
Where it is measured
Questions
Frequently asked
Colorimeter or spectrophotometer?
A colorimeter is simple and economical for methods with a fixed filter. A spectrophotometer sets any wavelength, which suits method development and a wider range of tests.
Are cuvettes supplied?
Spectrophotometers ship with two 10 mm glass cuvettes; the K-factor colorimeter ships with five glass sample tubes.
Application support
Comparing colorimeters and spectrophotometers?
Share the tests you run. A specialist will recommend the right instrument.
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