宁波市镇海区大气降尘矿物组成及来源解析

为探讨宁波市镇海区大气降尘矿物组成及来源，用X射线衍射法分析了镇海区6个土地功能区2019年12月至2020年11月4个季度的大气降尘样品的矿物组成和含量，并开展了矿物来源解析。结果显示，降尘中以石英、长石、碳酸盐类矿物和黏土矿物为主，年均质量分数分别为29.2%、33.3%、24.2%和7.7%,且不同功能区各季度降尘中矿物含量普遍有显著差异。来源解析表明，镇海区降尘中矿物来源主要以地面扬尘输入为主，同时周边源区输入及人类活动和工业密集区燃煤等输入对降尘矿物组成有较显著影响，除黏土矿物、碳酸盐类矿物和长石类矿物之外，其他矿物的含量还与不同季节的气温和风向有关。

Mineral Composition and Source Apportionment of Atmospheric Dust Fall in Zhenhai District of Ningbo City

In order to explore the mineral composition and source of atmospheric dust fall in the Zhenhai District of Ningbo,the dust fall samples collected in four seasons from december,2019 to november,2020 in six land functional zones in Zhenhai District have been analyzed by X-ray diffraction,based on which the source analysis of minerals has been conducted.The results showed that the dust fall was mainly composed of quartz,feldspar,carbonates and clay minerals,which the annual mean contents were 29.2%,33.3%,24.2% and 7.7%,and there were significant differences in minerals content among dust fall from different land functional zones throughout the year.The source analysis indicated that the minerals of dust fall in Zhenhai District mainly came from ground dust.Additionally,the import of surrounding areas,human activities and coal combustion in industrial areas were considered to play an important role in this process.In addition,the contents of other minerals apart from clay minerals,carbonates and feldspathoid were also related to the temperature and wind direction in different seasons.