Partitioning behavior and influence factors of heavy metals between settled dust and its extracted water phase:a case study of Nanchang city
WANG Xiao1, NIE Ming-hua1,2, YAN Cai-xia1, SHENG Yan-ru1, CHEN Jie1, DING Ming-jun1
1. Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, School of Geography and Environment, Jiangxi Normal University, Nanchang 330022; 2. Key Laboratory of Eco-geochemistry, Ministry of Natural Resource, Beijing 100037, China
Abstract:The spatial distribution of heavy metal concentrations in dust and its dissolved phase in different functional areas and bus stations was analyzed in Nanchang City. In addition, the influence of the physicochemical properties of dust and its dissolved phase on the partitioning behavior of heavy metals in the solid-liquid phase of dust was investigated by combining various analytical techniques. Results showed that the concentrations of total heavy metals in the dust and its dissolved phase in Nanchang city were 310~4393μg/g and 2.17~55.62μg/g. The spatial distribution of the heavy metals in the dust and its dissolved phase might be influenced by the traffic arteries with high traffic flow and the wear of automobile tire parts, and the high-value areas were mainly located near Nanchang County Government, some colleges and universities, passenger stations and driving schools. Results of the risk assessment indicated that the comprehensive ecological risk of heavy metals from dust in Nanchang City was generally at a medium level, and Cr and As had a certain carcinogenic risk. The percentage of heavy metals in the dissolved phase in the dust (i.e. K value) was ordered as follows:Ni>Mn>Cu>As>Cr>Zn>Pb. The higher K values were primarily located in the densely populated areas, traffic roads, and near passenger stations. Most of the physicochemical properties of the dust and its dissolved phase had a significant positive correlation with the distribution of Pb, As and Mn, and the higher dissolved organic carbon and humification degree in the dissolved phase had a dominant effect on the release of heavy metals from dust to the dissolved phase.
王筱, 聂明华, 晏彩霞, 盛燕茹, 陈洁, 丁明军. 重金属在灰尘及其水溶解相中的分布特征及其影响因素——以南昌市为例[J]. 中国环境科学, 2022, 42(6): 2862-2877.
WANG Xiao, NIE Ming-hua, YAN Cai-xia, SHENG Yan-ru, CHEN Jie, DING Ming-jun. Partitioning behavior and influence factors of heavy metals between settled dust and its extracted water phase:a case study of Nanchang city. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(6): 2862-2877.
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