Li Peng-Zhi, Li Qian, Shi Jin-Hui, Gao Hui-Wang, Yao Xiao-Hong
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
Huan Jing Ke Xue. 2018 Jul 8;39(7):3067-3074. doi: 10.13227/j.hjkx.201712231.
PM and total suspended particulate (TSP) samples were synchronously collected in Qingdao from June to July 2016. The total and water-soluble concentrations of 12 trace elements in these samples were analyzed to investigate their distribution characteristics in fine and coarse particles as well as their dry deposition fluxes. The results showed that the total mass concentrations of Al, Fe, Sr, Mn, and Ba, which are expected to mainly originate from crustal sources, were generally distributed in the coarse particles, and the part mass in the coarse mode accounted for 55%-60% of their total concentrations. Cr, Ni, V, Zn, Pb, As, and Cd, which mainly originate from anthropogenic contributors, generally existed in fine particles where the part mass accounted for 65%-85% of their total concentrations. The soluble mass concentrations of trace elements, whether from crustal or anthropogenic sources, were mainly distributed in the fine particles. The proportions of Al, Fe, Mn, and Ba in soluble mass concentration existing in the fine particles were 50%-80% and 70%-90% for Cr, Ni, V, Zn, Pb, As, and Cd. The solubility of trace elements was higher in fine particles than in coarse particles. The soluble concentrations of trace elements exhibited a positive correlation with acid compounds, and the solubility exhibited a negative correlation with pH in the fine particles, implying that acidification processes play a key role in determining the solubility of trace elements in fine particles. The soluble fractions in the total dry deposition flux of Al and Fe were only 1%-2%; that of Sr, Ba, Cr, and Pb were about 30%-40%; and that of Mn, Ni, V, Zn, As, and Cd were about 50%-60%. The atmospheric deposition of soluble Fe supported phytoplankton carbon production of (194±150) mg·(m·d), contributing about 10% of the primary productivity in the Yellow Sea.
2016年6月至7月期间，在青岛同步采集了PM和总悬浮颗粒物（TSP）样本。分析了这些样本中12种微量元素的总量和水溶性浓度，以研究它们在细颗粒物和粗颗粒物中的分布特征及其干沉降通量。结果表明，预计主要源自地壳源的Al、Fe、Sr、Mn和Ba的总质量浓度一般分布在粗颗粒物中，粗模态部分质量占其总浓度的55%-60%。主要源自人为源的Cr、Ni、V、Zn、Pb、As和Cd一般存在于细颗粒物中，其部分质量占总浓度的65%-85%。微量元素的可溶性质量浓度，无论是来自地壳源还是人为源，主要分布在细颗粒物中。细颗粒物中可溶性质量浓度中Al、Fe、Mn和Ba的比例为50%-80%，Cr、Ni、V、Zn、Pb、As和Cd为70%-90%。微量元素在细颗粒物中的溶解度高于粗颗粒物。微量元素的可溶性浓度与酸性化合物呈正相关，在细颗粒物中溶解度与pH呈负相关，这意味着酸化过程在决定微量元素在细颗粒物中的溶解度方面起关键作用。Al和Fe总干沉降通量中的可溶性部分仅为1%-2%；Sr、Ba、Cr和Pb约为30%-40%；Mn、Ni、V、Zn、As和Cd约为50%-60%。可溶性Fe的大气沉降支持浮游植物碳产量为（194±150）mg·(m·d)，约占黄海初级生产力的10%。
