Crude oil samples from various oil fields of Pakistan have been analysed for metal ions by using a mixed solvent system as well as by dry ashing procedure. It has been found possible to eliminate the use of organo-metallic standards hence in both cases pure metals or inorganic salts are used as reference materials. Absorbance of trace metals has been measured in an air-acetylene flame.
Z U KIRMANI ,J ANWAR ,F NAHID ,
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