Dynamic arsenic aging processes and their mechanisms in nine types of   Chinese soils

doi:10.1016/j.chemosphere.2017.08.086

CORC > 北京大学 > 城市与环境学院

	Dynamic arsenic aging processes and their mechanisms in nine types of Chinese soils
	Wang, Yanan ; Zeng, Xibai ; Lu, Yahai ; Bai, Lingyu ; Su, Shiming ; Wu, Cuixia
刊名	CHEMOSPHERE
	2017
关键词	Arsenic (As) Soil types Aging mechanism Approximate aging equilibrium time Kinetic equation fitting CONTAMINATED SOILS COMPETITIVE ADSORPTION SEQUENTIAL EXTRACTION DIFFUSIVE GRADIENTS PHOSPHATE RELEASE ACTIVATED ALUMINA SOUTHEAST CHINA CLAY-MINERALS BIOACCESSIBILITY KINETICS
DOI	10.1016/j.chemosphere.2017.08.086
英文摘要	Although specific soil properties controlling the arsenic (As) aging process have been studied extensively, few investigations have attempted to determine how soil types influence As bioavailability and fractionations in soils. Nine types of soil were selected from typical grain producing areas in China, and the bioavailability and fractionations of As during aging were measured. Results showed that available As in all soils rapidly decreased in the first 30 days and slowly declined thereafter. In spiked soils, As easily became less available and less toxic in low pH soils compared to high pH soils, demonstrating the importance of soil pH on As availability. Results from fitting kinetic equations revealed that the pseudo second-order model described the As aging processes well in all soils (R-2 = 0.945-0.999, P < 0.01, SE = 0.09-4.25), implying that the mechanism for As aging combined adsorption, external diffusion, and internal diffusion. Fe oxides were more important than Al oxides for determining the As aging rate (vertical bar k vertical bar). Based on these results, we are the first to propose the approximate aging equilibrium time (7) for As, which was mainly influenced by soil clay content. The shortest time for approximate stabilization of As aging was 28 d in latosol soils (LS), while the longest approximate equilibrium time was 169 d in cinnamon soils (CS). Individual soil properties controlling the variation in different As fractionations further confirmed that the influences of soil types on As aging were the result of the combined effects of soil properties and a time-consuming redistribution process. (C) 2017 Elsevier Ltd. All rights reserved.; National Natural Science Foundation of China [41401280]; SCI(E); ARTICLE; 404-412; 187
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/470396]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Wang, Yanan,Zeng, Xibai,Lu, Yahai,et al. Dynamic arsenic aging processes and their mechanisms in nine types of Chinese soils[J]. CHEMOSPHERE,2017.
APA	Wang, Yanan,Zeng, Xibai,Lu, Yahai,Bai, Lingyu,Su, Shiming,&Wu, Cuixia.(2017).Dynamic arsenic aging processes and their mechanisms in nine types of Chinese soils.CHEMOSPHERE.
MLA	Wang, Yanan,et al."Dynamic arsenic aging processes and their mechanisms in nine types of Chinese soils".CHEMOSPHERE (2017).