Atomic absorption spectrophotometer laboratory of the Central Instrumentation laboratory of DUVASU, Mathura is equipped with Perkin Elmer model AAnalyst 400 and HGA 900. AAS is a sophisticated instrument that aids in analyzing the concentration of heavy metals and other elements of nutritional and biological importance in biological/ liquid samples on the basis of absorption of energy from specific wavelengths i.e. 190-900 nm of light. The equipment is equipped with Flame, Mercury Hydride Generation (MHG) and Graphite Furnace for analysis of of Pb, Cd, Hg, As, Ni, Mb, Ca, Fe, Mn, Cu, Zn, Na, Cr and Se etc.