Abstract
Three kinds of plant leaves, Chinese white poplar, arborvitae and pine needles were evaluated as a biomonitor for air pollution studies. Thirty-two trace elements have been determined by using relative and the K0 methods of instrumental Neutron Activation Analysis (NAA). The results indicated that Chinese white poplar leaves are a good biomonitor in particular seasons and the pine needles are better than arborvitae for yearly monitoring. Air pollution in Beijing city using poplar as a biomonitor for 46 sampling sites was evaluated. The results indicate some sites are seriously polluted by some elements. In general, northeast in Beijing is a clean area and southwest is relatively polluted.
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