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- Title
腐植酸和Cd<sup>2+</sup>对黏土胶粒在饱和多孔介质中迁移的影响.
- Authors
唐章; 杨新瑶; 闫馨予; 张海燕; 杨悦锁
- Abstract
With the aim to explore the impact of humic acid(HA)and cadmium ion(Cd2+)on the transport of clay colloids in saturated po⁃ rous media, co-transport column experiments were performed using montmorillonite and kaolinite colloids as surrogates. Results showed that the deposition rate of kaolinite colloids was the highest in the absence of HA and Cd2+(3.72 min-1), lower in the presence of only Cd2+ (2.82 min-1), even lower in the presence of both HA and Cd2+(2.01 min-1), and the lowest in the presence of only HA(0.46 min-1). The sim⁃ ilar trend in changing deposition rate in response to the variability of CdCd2+ and/or HA was also observed for montmorillonite colloids, i.e., the rate was 1.02 min-1 in the absence of HA and Cd2+, 0.97 min-1 in the presence of only Cd2+, 0.85 min-1 in the presence of both HA and Cd2+, and 0.30 min-1 in the presence of only HA. These results demonstrated the consistent role of HA and Cd2+ in the mobility of both clay col⁃ loids; HA and Cd2+ both promoted the transport of the two clay colloids. The effect of HA was stronger than that of Cd2+. Moreover, an antago⁃ nistic interaction between humic acid and cadmium ions occurred, rendering the combined effect of the two lower than that of only HA. Based on the particle size and zeta potential measurement of the clay colloids, we speculated that HA and Cd2+ promoted the colloid mobili⁃ ty via different mechanisms:HA achieved this by modifying the surface electrical properties of the clay colloids, while Cd2+ achieved this by inducing particle aggregation. These findings improve current knowledge on the translocation and concentration distribution of natural soil colloids in the environment.
- Publication
Journal of Agro-Environment Science, 2019, Vol 38, Issue 1, p111
- ISSN
1672-2043
- Publication type
Article
- DOI
10.11654/jaes.2018-0056