Abstract:
Objectives To analyze and evaluate the change of chemical components, such as rare earth elements, in the atmospheric particulates during sand-dust weather.
Methods The daily concentration of particulate matter in aerodynamic diameter ≤2.5 μm (PM2.5) and ≤10 μm (PM10) were measured by air samplers in Baotou city during the spring of 2005 and 2006 respectively.The content of chemical components in particulates was determined by the inductively coupled plasma -mass spectrometer.All data were analyzed statistically by software SPSS 13.0.
Results In comparison with the non-sand-dust weather, the levels of La, Ce, Pr, Nd, Sm, Eu and Gd in the PM2.5 during sand-dust weather in 2005 were higher (P < 0.05), and the levels of Dy, Tm and Lu in the PM10 in 2006 during the sand-dust weather were also higher (P < 0.05).
Conclusions The level of rare-earth elements, such as La and Ce, increased in the particulates during the sand-dust weather and the content distribution of components in particulates were the same as that in the crust of the earth.It is suggested that the sources of sand-dust is from the rare-earth mining area in the vicinity.
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