【摘要】 利用 X 射线衍射(XRD)仪、扫描电镜 X 射线能谱(SEM/EDX)仪研究大气降尘矿物成分和颗粒物形貌特征。结果表明,韶关市大气降尘主要矿物成分为伊利石、斜长石、绿泥石、石英、方解石、白云石和无定型非晶质物等, 大气颗粒物形貌可分为4种类型：粒状、片状单矿物,链状集合体,圆球状飘珠和不规则粒状集合体。伊利石、绿泥石来源于地面扬尘,方解石、白云石来源于建筑扬尘,无定型非晶质物来源于工业烟尘。粒状、片状单矿物是地面扬尘的标志,链状集合体和圆球形飘珠是工业烟尘的标志,不规则粒状集合体是建筑扬尘的标志。大气降尘矿物成分和形貌特征是判别污染物来源的重要标志。更多还原

【Abstract】 In order to study mineral composition and morphology of atmospheric dust fall and to estimate the source of the particles, the authors employed XRD and SEM/EDX to perform investigations in such aspects in Changsha City.The results reveal that the main minerals are illite,plagioclase,chlorite,quartz,calcite,dolomite and amorphous matter,with the illite and chlorite derived from the surface raised dust,and the amorphous from the industrial ash.There are four morphological types,namely grained and flaky individual mineral,chain-like aggregates,spherical flying beads and irregular aggregates,with the chain-like and spherical ag- gregates being indicators of industrial ash,and other particles derived from other sorts of raised dust.The mineral composition and morphology of atmospheric dust fall serve as important criteria in identifying pollution sources.更多还原