What is atomic absorption spectroscopy?
Atomic Absorption Spectroscopy is an analysis technique for rapid trace metal analysis. It is based on element specific wavelength light absorption by ground state atoms in the flame or electrothermal graphite furnace.

It's wide applications in the analysis for trace metals in soils, lakes, rivers, oceans, and drinking water, pharmaceuticals, foods and beverages, geological and mineralogical samples, petroleum products, biological fluids and specimens and forensic analysis. 

How to select model of atomic absorption spectrometer?
It is common to get detect limit in ppm levels using flame to select ATA3500 and a higher sensitivity of ppb levels when we using graphite furnace atomisation to select ATA6500.