Atomic Absorption Spectrometer
This instrument is used to determine the concentration of metals in water samples, particularly lead and copper, through the absorption of optical radiation (light) by free atoms in the gaseous state. After a small amount of sample is atomized in a graphite-coated furnace, free atoms absorb element-specific wavelengths of light emitted from hollow cathode lamps. Utilizing the Beer-Lambert law, the amount of light absorbed is linearly correlated to the concentration of analyte present. Ultimately, concentration measurements are determined from a working curve after calibrating the instrument with standards of known concentration.