The Interference And Elimination Of Analyzing Atomic Absorptions Of The Heavy Metal

Heavy metals in the environmental sample are generally analyzed by adopting the spectrum methods of the Atomic Absorption Spectrophotometry (AAS). But there might be the four common interferences in AAS: The spectrum interference, the physics interference, the chemistry interference and the ionization interference.The spectrum interference mainly comes from the light source and the atomizing instrument, including many layer lines interference, the superposed table lines interferences, the background table lines absorption( the light spreading and molecule absorption). Changing the gap's width examination can remove many layer lines interference. Selecting effective table line of the more anti- interference. However the molecule absorption is usually brought of by an acid radical ion. Using aqua of different densities of a little familiar sour as medium here , carrying on the flames method examination respectively to the Cd, Pb, Cr. As a result, carry on statistics to the examination analysis and get a conclusion. It has a great infection to the graphite stove measuring to use context absorb interference. Commencing with analyzing the reason for its creation,Consider that the methods of dispelling interferences are to improving base body about graphite stove and sample.Because the chemistry interference is more complicated, I find out some compendious methods of dispelling interferences by carrying on analyzing its procreant reason and combining myself practice of experience. Such methods as these: add the solvents of improving and solvents of releasing, use high temperature flame, chemistry apart and standard addition, etc.Pass the research analysis enunciation: Atomic Absorption Spectrometers should install the negative pole light of single element; Add the solvents of improving base body or solvents of releasing and utilizes appropriately flame type and state, etc.