Huang Guanxing, Chen Zongyu, Wang Jia, Hou Qinxuan, Zhang Ying
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, China.
Hebei Key Laboratory of Groundwater Remediation, Shijiazhuang, 050061, China.
Environ Sci Pollut Res Int. 2016 Mar;23(5):4594-601. doi: 10.1007/s11356-015-5701-2. Epub 2015 Oct 31.
The present study focused on the influence of temperature variation on the aging mechanisms of arsenic in soils. The results showed that higher temperature aggravated the decrease of more mobilizable fractions and the increase of less mobilizable or immobilizable fractions in soils over time. During the aging process, the redistribution of both carbonate-bound fraction and specifically sorbed and organic-bound fraction in soils occurred at various temperatures, and the higher temperature accelerated the redistribution of specifically sorbed and organic-bound fraction. The aging processes of arsenic in soils at different temperatures were characterized by several stages, and the aging processes were not complete within 180 days. Arsenic bioaccessibility in soils decreased significantly by the aging, and the decrease was intensified by the higher temperature. In terms of arsenic bioaccessibility, higher temperature accelerated the aging process of arsenic in soils remarkably.
本研究聚焦于温度变化对土壤中砷老化机制的影响。结果表明，随着时间推移，较高温度加剧了土壤中更易迁移组分的减少以及较不易迁移或固定组分的增加。在老化过程中，土壤中碳酸盐结合态组分以及专性吸附态和有机结合态组分在不同温度下均发生了重新分布，且较高温度加速了专性吸附态和有机结合态组分的重新分布。不同温度下土壤中砷的老化过程具有几个阶段特征，且在180天内老化过程并未完成。老化显著降低了土壤中砷的生物可利用性，且较高温度加剧了这种降低。就砷的生物可利用性而言，较高温度显著加速了土壤中砷的老化过程。
