重庆城区大气颗粒物的元素、离子及物相组成研究

Study on the Element,Ion and Phase Composition of Airbrone Dust in Chongqing City

采用 X-射线能谱 ( EDX)、傅立叶红外光谱 ( FT- IR)、X-射线衍射 ( XRD)对重庆市区大气颗粒污染物的元素组成、离子、物相组成进行了研究。 EDX检出了 S、Cl、K、Ca、Ti、Cr、Mn、Fe、Cu、Se、Sr、Zr、Rb、Ga、Hg、Zn、Ni等元素 ,FT- IR光谱发现主要存在 SO2 - 4 、NH+ 4 和 NO- 3,XRD结果表明存在 Ca SO4· 2 H2 O、α- Si O2 、( NH4) 2 Ca( SO4) 2 ·2 H2 O、( NH4) 2 SO4等 4个主要物相以及 Fe3O4、Ca CO3等物相。初步讨论了重庆大气颗粒物的污染来源及其时间。

The element,ion and phase composition of airborne particles in Chongqing city was investigated by using Energy-Dispersion X-ray spectroscopy(EDX),Fourier Transfer Infrared spectroscopy(FT-IR) and X-ray diffraction(XRD).The results show that there are the elements of S,Cl,K,Ca,Ti,Cr,Mn,Fe,Cu,Se,Sr,Zr,Rb,Ga,Hg,Zn,Ni and so on (from EDX),the ions of SO 2- 4?NH + 4,NO - 4(from FT-IR),and the phases of CaSO 4·2H 2O?(NH 4) 2SO 4?α-SiO 2?(NH 4) 2Ca(SO 4) 2·H 2O,Fe 3O 4,CaCO 3 in the airborne particles.Meanwhile,the source of this pollution and its distribution with space and time were discussed in brief.