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MY class call instrumental chemistry. I want report about FTIR. I will send my friend report. take a look on it and write my report. Do not copy anything.


FTIR, which stands for Fourier Transform Infrared Spectroscopy, is a technique used to obtain spectrums of absorption and emission (for our purposes; many other purposes exist). An FTIR spectrometer, the instrument that uses the FTIR technique, simultaneously collects spectral data in a wide spectral range. The term Fourier Transform Infrared Spectroscopy originates from the fact that a Fourier transform (a mathematical process) is required to convert the raw data into the actual spectrum. Since no two compounds produce identical spectrums, infrared spectroscopy can be used for identification of compounds based on their individual unique characteristics.

An internal standard is a chemical substance that is very similar, but not identical, to the chemical species of interest in the samples. It is added in a constant amount to all samples. The purpose of the internal standard is that it can be used for calibration by plotting the ratio of the analyte signal to the internal standard signal as a function of the analyte concentration of the standards. This is done to correct for the loss of analyte during sample preparation.

The compound being used in this experiment is xylene, which is aromatic. There are three isomers of xylene, depending on the relative positions of the methyl groups to one-another: o-xylene, m-xylene, and p-xylene, as shown below.


Figure 1: Three Isomers of Xylene


In this lab, we will prepare various solutions of the xylene isomers following the procedure in the Experimental Section below. Using the data collected, we will use sample data (solutions 1-9) of our known solution concentrations/ratios to determine the components of xylene isomers present in solutions 10 & 11, our unknown samples.


Experimental Section:

Obtain 11 2mL volumetric flasks, and add the following (refer to Figure 2) to it precisely, using a separate, clean, dry, 1mL calibrated pipet for each solution. To solutions 4-11 was added 0.10mL of the internal standard, o-xylene. All solutions are then diluted to 2.0mL by adding the amount of Cyclohexane indicated in Figure 2.