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• W2393048979 abstract "Particles and gases are removed from the atmosphere by wet deposition (rain, fog and dew) and dry deposition. The wet deposition process is a major pathway of acidic pollutants from the atmosphere to the biosphere. Dew has attracted great interest and has been extensively studied on its amount. The chemistry of dew has received little attention. In order to discuss the dew ecology efficiency and reveal the air status of surface layer in the Sanjiang Plain, pH and the concentrations of 26 types of metal elements such as K, Na, Ca, Mg were monitored and analyzed. The experiment was organized in the Sanjiang Mire Wetland Experimental Station (47°35' N, 133°31' E), Chinese Academy of Sciences, located in Tongjiang, Heilongjiang Province, Northeast China. Carex lasiocarpa is the dominant plant, and it is selected as the typical experiment plot. Carex lasiocarpa dew was collected form mid July to mid September in 2008 and late May to early September in 2009. The results showed that the mean pH of Carex lasiocarpa dew was (6.42±0.23) and the acid dew never occurred in the research area. Therefore, dew can not damage protective surfaces on leaves, interfere with guard cells and poison plant cells from the aspect of pH. The types of metal element in Carex lasiocarpa dew were abundant. K, Mg, Ca are the nutrient elements and Mn, Cu, Cr, Zn, Na, Mo, V, As, Fe, Ni are the trace elements. They were all can be monitored in Carex lasiocarpa dew. The mean concentrations of Cd, Be, Co, Se, Mo, Th, U and Tl were below 1.0 μg/L. The mean concentrations of Pb, As, Ni, Cr, V, Ag, Cu and Zn were between 1.0 μg/L and 100 μg/L. The mean concentrations of Na, Al, Fe and Ba were between 100 μg/L and 1000 μg/L. The mean concentrations of K, Mg, Ca and Mn were higher than 1 000 μg/L. Carex lasiocarpa dew can provide nutrient elements and trace elements to plant. The metal elements in Carex lasiocarpa surface water and dry deposition were the main sources of metal in dew. The contents of K, Ca, Na, Mg, Mn, Fe, Zn in Carex lasiocarpa dew were higher than those in rain obviously and it demonstrated that dew can offer more nutrient elements than rain. This phenomenon attributed to the evaporation effect on dew samples as it was exposed to longer time than rain. Dew can reveal the air pollution status and it is significant to monitor the chemistry character of dew. The trace amount of Pb, Ba, Se, As, Co, Cr, Cu in Carex lasiocarpa dew implied that there is no automobile exhaust, coal combustion or industrial pollution in this area. Dew formation is a local phenomenon, significantly influenced by microclimatic ambiance, land profile, and favorable meteorological conditions. Analyzing chemistry character of dew is a simple and useful method to reveal the status of surface layer. This method can provide the assessment of air pollution and judge the quality of air. Formation of acidic dew is critical to assess corrosion process. Consequently, dew should pay much more attention to collect and analyze." @default.
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• W2393048979 date "2011-01-01" @default.
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• W2393048979 title "Metal Concentrations of Dew Collected from Carex lasiocarpa in Sanjiang Plain" @default.
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