Cells

Cells

Samples are placed in cells for measurements. The figure above shows the ten available shapes of sample cells. Generally, the square cell with an optical path length of 10 mm is used. However, in cases where absorption is low, a cell with a longer optical path length is used, whereas when absorption is high, a cell with a shorter optical path length is used. The following describes the relationship between absorption strength (absorbance) and optical path length. This formula can be used to determine the appropriate optical path length.

Absorbance A = E•C•L
E: Absorption coefficient
C: Concentration of sample
L: Optical path length

A square cell with a stopper is generally used to measure volatile liquid samples, and a micro-cell is used to measure a sample with a small volume. Sample cells are made of the three materials given below. The wavelength range in which measurement is possible is fixed for each material as indicated:

Fused silica (S cells): 190 to 2500 nm
Glass (G cells): 320 to 2500 nm
Fused silica (IR cells): 220 to 3200 nm

Name No.
Square cell Optical path length 10mm 1
Optical path length 20mm 6
Optical path length 50mm 6
Optical path length 100mm 6
Square cell with stopper Optical path length 10mm 2
Semi-micro cell Optical path length 10mm 3
Semi-micro black cell Optical path length 10mm 3'
Micro black cell Optical path length 10mm 8
Super-micro black cell Optical path length 10mm 7
Optical path length 5mm 7'
Cylindrical cell Optical path length 10mm

4
Optical path length 20mm
Optical path length 50mm
Optical path length 100mm
Short path cell Optical path length 1mm
5
Optical path length 2mm
Optical path length 5mm

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