内蒙古沙漠与沙尘粒子中磷形态分布特征及其环境意义
Distribution characteristics of phosphorus forms in the sand-dust and the desert particles in Inner Mongolia and its environmental significance
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摘要: 根据我国中路沙尘暴的影响范围和移动路径,应用颗粒物中磷的连续浸提技术,选择研究了8个站位的颗粒物样品中磷的赋存形态和分布特征.研究结果表明,各粒级样品中无机磷(IP)含量范围在300.16—1916.99 μg·g-1,占总磷(TP)比率86.11%—99.84%,TP含量主要受IP控制,有机磷(POrg)含量远低于IP,彼此之间表现为负相关关系;沙尘粒子Y1—Y4(呼和浩特,2005年—2010年沙尘暴期间收集)的TP、IP、生物可交换磷(BP)和可交换态磷(Pex)含量远高于沙尘暴源地及沿途地区地表颗粒物,这与沙尘暴源地及影响区域磷污染状况及地质环境条件关系密切;粒径小于57 μm的颗粒物样品的TP、IP、PCa含量均高于自然粒径颗粒物样品.Abstract: Based on the covered area and the movement route of the middle-path sandstorms, 8 sampling sites were selected for collecting sand dust and desert particles. Phosphorus forms and distributions in the samples were analyzed with the sequential extraction methods. The results showed that the concentration of inorganic phosphorus (IP) in the samples was in the range of 300.16 to 1916.99 μg·g-1, with a ratio of 86.11%—99.84% to total phosphorus (TP), indicating that the samples were predominanted by IP. Organic phosphorus(POrg)concentrations in the samples were lower than IP, and exhibited a negative correlation with each other. The contents of TP, IP, BP (bioavailable phosphorus) and Pex (exchangable phosphorus) in the sand-dust particles (Y1—Y4) collected during sandstorm in Hohhot in the period of 2005—2010 were higher than that of the particulates from the areas of the sandstorm source and routes. The high contents were closely associated with the phosphorus pollution in the sandstorm source area and the condition of geologic environment;The contents of TP, IP and PCa (calcium bound phosphorus) in the particles of <57 μm sizes were higher than those of the particles of the natural sizes.
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