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 10 mm | 1 |
| Optical path length 20 mm | 6 | |
| Optical path length 50 mm | 6 | |
| Optical path length 100 mm | 6 | |
| Square cell with stopper | Optical path length 10 mm | 2 |
| Semi-micro cell | Optical path length 10 mm | 3 |
| Semi-micro black cell | Optical path length 10 mm | 3' |
| Micro black cell | Optical path length 10 mm | 8 |
| Super-micro black cell | Optical path length 10 mm | 7 |
| Optical path length 5 mm | 7' | |
| Cylindrical cell | Optical path length 10 mm | 4 |
| Optical path length 20 mm | ||
| Optical path length 50 mm | ||
| Optical path length 100 mm | ||
| Short path cell | Optical path length 1 mm | 5 |
| Optical path length 2 mm | ||
| Optical path length 5 mm | ||
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Applications
| Documents | Date Creation Date |
|---|---|
2019-04-19 |
News / Events
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FTIR TALK LETTER Vol. 43 has been published
The article about the Introduction to the Spectrum Advisor can be used on all Shimadzu FTIR systems controlled by LabSolutions IR. Learn the key points of infrared spectral analysis for aliphatic unsaturated hydrocarbons and aromatics.
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Analytical Solutions for Microplastics
Shimadzu provides analytical and measuring instruments for the study of a variety of plastic materials: for R&D, characteristic evaluation of raw materials, quality control for plastic products, and deterioration analysis. With these diverse techniques, Shimadzu provides optimal solutions for microplastics research.
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Shimadzu has released the IRSpirit-X Series
IRSpirit FTIR spectrophotometers are extremely compact, but can still be used with standard accessories from Shimadzu and other manufacturers. IRSpirit instruments come with IR Pilot software, which offers 23 application programs without the need for parameter setup. Measure multiple samples with just a few clicks.
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Shimadzu has released the MAP-100
The MAP-100 automates the typical steps needed to isolate microplastics. This improves the reproducibility of the analytical workflow, enables lab technicians to focus on other tasks, and makes handling of reagents safer.
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Latest issue of Shimadzu Journal, featuring Forensics / Toxicology, has come out.
This issue focuses on "Forensics / Toxicology", an area where science and technology are particularly important and needed. It starts with two customer interviews.
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Cellulose nanofibers
Given that cellulose nanofibers（CNFs）offer attractive physical characteristics, such as light weight, strength, and hardness, they not only enable materials with advanced functionality, but are expected to be used as a reinforcing material that can reduce the weight of composite materials.