青岛大气气溶胶中微量元素浓度及溶解度的粒径谱分布

发布时间：2018-01-09 04:04

本文关键词：青岛大气气溶胶中微量元素浓度及溶解度的粒径谱分布　出处：《中国环境科学》2017年03期 　论文类型：期刊论文

【摘要】：利用2016年1~3月在青岛采集的Anderson分级气溶胶样品,分析其中10种微量元素总浓度和溶解态浓度,讨论了微量元素的浓度及溶解度的粒径谱分布特征及大气酸化过程的影响.结果表明,微量元素总浓度的粒径谱多数呈现单峰分布,Fe、Al、Ba、Sr等地壳元素总浓度的50%~60%出现在2.1~7.0μm粗粒子上;Cd、As、Zn、Pb等人为元素总浓度的60%~70%出现在0.43~2.1μm细粒子上;但Mn和Ni的粒径谱分布没有明显优势.溶解态微量元素的粒径谱也多呈现单峰分布,70%左右的Fe、Al、Ba、Sr、Mn集中在0.43~4.7μm粒子上;80%左右的Cd、As、Zn、Pb集中在0.43~2.1μm细粒子上;Ni的粒径谱分布与其总浓度的相似,在各粒级上无明显优势.微量元素溶解度的粒径谱分布呈现细粒子中的高于粗粒子中的,尤其是地壳元素这种分布趋势更为明显.气溶胶pH值的粒径谱分布特征及其与微量元素溶解度的显著相关关系表明,大气酸化过程是控制微量元素溶解度随粒径变化的主要因子.
[Abstract]:The month of 2016 1~3 collected in Qingdao Anderson classification of aerosol samples, the analysis of the 10 kinds of trace elements and the concentration of total dissolved concentration, the effect of concentration and solubility of trace elements in particle size distribution characteristics and atmospheric acidification process are discussed. The results showed that the total concentrations of trace elements in particle size spectra showed most of the unimodal distribution, Fe Al, Ba, Sr, etc. the total concentration of 50%~60% crustal elements appear in the 2.1~7.0 m Cd, coarse particles; As, Zn, Pb et al for the elements of the total concentration of 60%~70% in 0.43~2.1 m fine particles; but Mn and Ni particle size distribution have significant advantages. The dissolved trace elements. Size spectra also show unimodal distribution, about 70% of the Fe, Al, Ba, Sr, Mn concentration in 0.43~4.7 m particle; about 80% of the Cd, As, Zn, Pb on 0.43~2.1 m fine particles; the particle size of Ni spectrum distribution and total concentration is similar to that of no obvious advantage in the particle size on the trace element. The solubility of prime size spectra showing the distribution of fine particles is higher than that of the coarse particles, especially the crust elements distribution trend is more obvious. That was a significant correlation between the pH value of the aerosol size spectra and distribution characteristics of trace elements and the solubility of atmospheric acidification process is the main factor to control the micro element solubility with the particle size change.

【作者单位】：中国海洋大学环境科学与工程学院;中国海洋大学海洋环境与生态教育部重点实验室;
【基金】：国家重大科学研究计划项目(2014CB9537002) 国家自然科学基金资助项目(41210008,41176097)
【分类号】：X513
【正文快照】： 大气气溶胶的干湿沉降带来的微量元素对海洋生物生长有着重要影响[1-3],这种影响从根本上决定于沉降的微量元素的溶解度(通常以微量元素溶解态浓度占总浓度的百分比来表征)[4-5].气溶胶中微量元素溶解度主要受气溶胶来源及大气物理、化学过程等的影响[4].在气溶胶长距离迁移过

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