前处理方法对微量沙尘气溶胶样品矿物实验结果的影响

Influence of Pretreatment Method on the Result of Mineralogical Analysis for Low Mass Dust Aerosol Samples

为了探讨前处理方法对微量沙尘气溶胶样品矿物分析结果的影响,对2002年春季甘肃敦煌采集的3次沙尘暴样品分别进行了5次重复前处理和矿物分析实验研究.X射线衍射分析显示,8种沙尘气溶胶组成矿物的5次实验结果的标准偏差相对于平均值均较小.同时计算的石英、斜长石、方解石、伊利石、绿泥石和高岭石等沙尘气溶胶的主要组成矿物的相对标准偏差均小于10%,表明前处理方法对微量沙尘气溶胶样品的矿物分析结果影响较小.

The objective of this research was to discuss the influence of pretreatment on the result of mineralogical analysis for low mass dust aerosol samples.Three dust aerosol samples were collected at Dunhuang during three dust storm events in spring,2002.Each sample was operated by the pretreatment method and X-ray diffraction experiment for five times.The results show that little variation was observed for eight major minerals content among the five experiments,and the standard deviations for most minerals are also relatively low compared with their average values.The relative standard deviations were also calculated,which showed that major components of quartz,plagioclase,illite,kaolinite,chlorite,and calcite had the lower variability(less than 10%) while the small quantities minerals of potassium feldspar and dolomite had high variability(up to 10%).The results proved that this pretreatment method did not influence mineralogical analysis result for low mass aerosol samples.