The wavelength of the emissions are determined by a detector. Most atoms will emit light at different wavelengths so scientists may use this information to identify atoms in a sample. The intensity of emission is related to the amount of an atom in the sample. Scientist may use the wavelength and intensity to determine both the identity and amount of an atom. ICP-AES is often used for the detection of toxins, such as heavy metals. It may also be used for chemical studies.