FTIR, or Fourier Transform Infrared Spectroscopy, is a method used to identify and analyze the chemical composition of materials by measuring the absorption of infrared radiation.
While FTIR can offer valuable insights into the presence of certain functional groups and compounds in a sample, it is not usually used as the primary method to determine the purity of a material.
4 Key Points to Consider
1. Chemical Identification vs. Purity Measurement
FTIR is excellent for identifying the functional groups present in a material, which helps in understanding the general composition.
However, determining purity involves quantifying the amount of a specific component or the concentration of impurities relative to the main component.
This requires a method that can measure concentrations, which FTIR does not directly provide.
2. Quantitative Analysis
For quantitative analysis, techniques like gas chromatography (GC), high-performance liquid chromatography (HPLC), or mass spectrometry (MS) are more suitable.
These methods are designed to separate and quantify individual components, which is essential for determining purity.
3. Purity Definitions and Standards
There is no universally accepted definition of high purity, but it generally refers to materials with certain individual impurities held to levels below 0.1 ppm.
This level of precision is beyond the capabilities of FTIR, which is more qualitative than quantitative.
4. Application of FTIR in Purity Assessment
While FTIR itself may not determine purity, it can be used in conjunction with other techniques.
For example, FTIR can identify unknown impurities that might be quantified by other methods.
It can also confirm the absence of certain contaminants or unwanted compounds, which indirectly supports purity claims.
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