Inhaltsverzeichnis
REFLEX Analytical offers a comprehensive selection of UV-Vis-NIR cuvettes and cells precision fabricated from high quality UV Quartz, IR Quartz and glass materials. Most absorption cuvettes have two clear windows to allow maximum light transmittance through the sample linearly. Contrarily, scattering and fluorescence applications require the signal to be measured at 90 degrees to the light beam. For example, fluorescence cuvettes have all four sides polished to help with successful fluorescence experiments.
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- Transmission drops significantly in the mid IR, and at 4200 nm there is complete absorption.
- When ordering choose the cuvette or cell type, material and pathlength.
- They are often designed so that the light beam travels a distance of 1 cm through the contents, but the path length can vary from 1 or 2 mm all the way up to 10 cm.
Disposable cuvettes can be used in some laboratories where the beam light is not high enough to affect the absorption tolerance and consistency of the value. Fingerprints and droplets of water disrupt light rays during measurement, so low-lint gauze or cloth may be used to wipe clean the outer surface of a cuvette before use. Mild detergent or ethanol may be applied, followed by rinsing with tap water. Acid and alkali are avoided due to their corrosive effects on glass, and acetone is unsuitable when working with plastic cuvettes.
Uv
This precise value is used as the sample pathlength in the Beer's Law calculation to determine solution concentrations. For solutions with absorption coefficients that are too high for a standard path length cuvette, we have cuvettes with path lengths 1 cm cuvette as short as 1 mm. You can achieve a ten-times reduction in absorbance by simply swapping cuvettes, rather than wasting time and solvent by needing to dilute your solutions. IR quartz cuvettes are suitable for wavelengths from 250nm to 3,500nm. Sub-micro cuvettes hold a measuring volume of 20 microliters (µl) to 350 µl. This cuvette is designed to measure through a specific z dimension, so it must match the beam’s height.
Lab4us Quartz Micro Cuvette Cell Black Walls
All our in-stock UV fused quartz cuvettes are made by diffusion bonding method. Quartz is heated to a high temperature and then adhered together by applying pressure. UV quartz cuvettes made in such method have much stronger chemical resistance and better life time than cuvettes made in other way such as being glued together. Disposable cells have a major advantage in that being single-use new from the box, they are always "clean" if stored properly.
Biochrome Scientific
Sapphire cuvettes are the most expensive, though provide the most durable, scratch-resistant, and transmissible material. The transmission extends from UV light to mid-infrared, ranging from 250 to 5,000 nm. Sapphire can withstand the extreme natural condition of some sample solutions and variances in temperature.