Atomic Emission Spectroscopy AES
Atomic emission spectroscopy (AES) is a technique used to determine the elemental composition of a sample by measuring the emission of light from atoms in the sample. When an atom is excited, its electrons move to a higher energy level. When the electrons return to their original energy level, they emit light at a specific wavelength. The wavelength of the emitted light is characteristic of the element, so by measuring the wavelength of the light, it is possible to identify the element.
What are the official methods of moisture content determination?
There are several official methods for determining the moisture content of a sample. These methods include:
- Karl Fischer Titration: This method is used to determine the moisture content of liquids and solids. The sample is dissolved in a solvent and then titrated with a Karl Fischer reagent. The Karl Fischer reagent reacts with the water in the sample, and the endpoint of the titration is reached when all of the water has reacted.
- Loss on Drying: This method is used to determine the moisture content of solids. The sample is heated in an oven at a specific temperature for a specific period of time. The loss in weight of the sample is due to the loss of moisture.
- Gas Chromatography: This method is used to determine the moisture content of gases. The sample is passed through a gas chromatograph, and the moisture is separated from the other gases. The moisture is then detected and measured.
The choice of which method to use depends on the type of sample and the desired accuracy of the results.