摘要
使用高分辨率环境扫描电镜和图像分析技术对北京PM10中矿物颗粒的微观形貌和粒度分布特征进行了研究.结果表明,北京PM10中的矿物颗粒按其形貌、组成特点可以分为单矿物和矿物集合体2类;矿物颗粒多以不规则的形态出现;形态规则的矿物主要是硫酸盐类矿物,是大气化学反应的产物,形态不规则的矿物是来自扬尘的原生矿物.不同类型污染产生的PM10中矿物颗粒的粒度分布特征表现不同,在沙尘暴样品和道路扬尘样品中矿物颗粒的粒度峰值在1～2.5μm;在局地扬尘的样品中,矿物颗粒的粒度较粗,主要分布在1～2.5μm和2.5～10μm.
Microscopy and size-distribution of mineral particles in Beijing PM_(10) was studied by high resolution Environmental Scanning Electronic Microscopy (ESEM) and image analysis technologies (IA). The ESEM analysis showed that minerals in PM_(10) had regular and irregular shapes, being composed of single minerals or mineral aggregates, respectively. Minerals with irregular shapes were popular in PM_(10). Energy-dispersive X-ray analyzer (EDX) analysis indicated that minerals with regular shapes were mainly sulfates, which were the production of atmospheric chemical reaction, while minerals with irregular shapes were mainly primary minerals, originated from geological sources. Three categories of mineral particles in PM_(10), the dust storm particles, local fugitive dusts and roadside dusts, were characterized for their size distributions. The number-size distribution of the dust storm and roadside dust particles had unimodal pattern with the peak in range of 1-2.5?μm, however, the number-size distribution of the local fugitive dust particles displayed major size ranges of 1-2.5?μm and 2.5-10?μm
出处
《环境科学学报》
CAS
CSCD
北大核心
2005年第7期863-869,共7页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.40275040)
上海市科委AM基金(No.0318)~~
关键词
矿物颗粒
微观形貌
粒度分布
可吸入颗粒物(PM10)
mineral particles
micro- morphology
size-distribution
airborne in halable particles (PM_(10))
