Interested to Buy Any Domain ? << Click Here >> for more details...
why KBr is used in FTIR SPECTROSCOPY and why is it necessary
to triturate KBr during FTIR analysis?
- 25 Answers
- 122911 Views
- Hikal, Lupin, Wockhardt, I also Faced
- E-Mail Answers
Answer Posted / bem nyax
This method exploits the property that alkali halides become plastic when subjected to pressure and form a sheet that is transparent in the infrared region. Potassium bromide (KBr) is the commonest alkali halide used in the pellets. Cesium iodide (CsI) may also be used to measure the infrared spectrum in the 400 to 250 cm-1 low-wavenumber region.
The preparation method for 13 mm-diameter pellets is described below. Approximately 0.1 to 1.0 % sample is well mixed into 200 to 250 mg fine alkali halide (the example of KBr is used below) powder and then finely pulverized and put into a pellet-forming die. A force of approximately 8 tons is applied under a vacuum of several mm Hg for several minutes form transparent pellets. Degassing is performed to eliminate air and moisture from the KBr powder. Inadequate vacuum may result in easily broken pellets that scatter light. Before forming the KBr powder into pellets, pulverize it to 200 mesh max. and then dry at approximately 110 °C for two to three hours. Note that rapid heating can oxidize some of the KBr powder to KBrO3, causing a brown discoloration. After drying the powder, store it in a desiccator.
When performing measurements, the background can be measured with an empty pellet holder inserted into the sample chamber. However, background measurements on a pellet holder with a pellet of KBr only, that contains no sample, can correct for infrared light scattering losses in the pellet and for moisture adsorbed on the KBr.
Reference >> http://www.shimadzu.com/an/ftir/support/ftirtalk/talk8/intro.html
| Is This Answer Correct ? | 14 Yes | 0 No |
Post New Answer View All Answers
mahagenco syllabus for the post of chemist
cefoperozone and sulbactam inj. hplc test method
What is rs test why we are performing rs test?
what is the structure of DOWEX-50
What is the diffrence in japan mkt requirement in analytical method validation over US?
How to start the dissolution development for unknown tab?
for which product require to do content uniformity? what is limit of cu?
What is a difference between potency and purity?
How much is the standard area for glc analysis
for inorganic molecules require to do RS, Assay and disso?
From where require to take the RLD sample?
Why we check moisture,ash & AIA in product
What is the diference between residual solvents and organic volatile matter
A ha tc is actual defination of retention time?
How can the GC or HPLC method is selected to determine the impurity profile in drug product?
