Dimethylformamide (DMF) can be tested for purity using a variety of methods. One common technique is gas chromatography (GC), where a sample of DMF is injected into a GC system. The sample’s components are separated based on their volatility and interaction with the stationary phase in the column. Identification and quantification of impurities can be determined from the resultant chromatogram. Another technique is nuclear magnetic resonance (NMR) spectroscopy that analyzes chemical shifts and coupling constants of protons and carbon atoms within the DMF molecule to give information on the molecular structure and the impurities present. Furthermore, assessing the purity of DMF can be done using the complementary methods of density measurement and refractive index determination.
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