Pyridine is an important intermediate in the production of pesticides and pharmaceuticals, as well as an important solvent in the polymer and textile industries. Important derivatives of pyridine include niacin and niacinamide (essential vitamins for human health), chlorophenylpiromin (an antihistamine), cetylpyridine salt (an insecticide and preservative), isoniazid (an important...

Spectrophotometry: It is a qualitative, quantitative and structural analysis method based on the absorption characteristics of material molecules to the wavelength of 200-760nm electromagnetic wave. Simple operation, high accuracy and good reproducibility. Light with a long wavelength (low frequency) has less energy, and light with a short wavelength (high frequency) has more energy....