Atomic absorption spectrometry was carried out on a Perkin Elmer Model AAnalys
800 with hollow cathode lamp (HCL) and electrode less discharge lamp (EDL). Electrode discharge lamp was used for volatile and non-volatile toxic heavy metals analysis under optimum operating conditions with an air-acetylene flame and argon gas. The instrument was controlled by a personal computer using Winlab software. Graphite furnace was used to measure (non-volatile) Pb and Cd metals and flow injection-mercury hydride system was used to determine (volatile) As and Hg metals.