| 腐植酸和Cd2+对黏土胶粒在饱和多孔介质中迁移的影响 |
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| 引用本文： | 唐章,杨新瑶,闫馨予,张海燕,杨悦锁.腐植酸和Cd2+对黏土胶粒在饱和多孔介质中迁移的影响[J].农业环境科学学报,2019,38(1):111-116. |
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| 作者姓名： | 唐章 杨新瑶 闫馨予 张海燕 杨悦锁 |
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| 作者单位： | 沈阳大学区域污染环境生态修复教育部重点实验室, 沈阳 110044,沈阳大学区域污染环境生态修复教育部重点实验室, 沈阳 110044,沈阳大学区域污染环境生态修复教育部重点实验室, 沈阳 110044,黑龙江省水文地质工程地质勘察院, 哈尔滨 150030,沈阳大学区域污染环境生态修复教育部重点实验室, 沈阳 110044;吉林大学地下水环境与资源教育部重点实验室, 长春 130021 |
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| 基金项目： | 国家自然科学基金面上项目（41672248，41471409）；辽宁省创新团队项目（LT2015017）；辽宁省特聘教授项目；沈阳市中青年科技创新人才项目（RC170244）；黑龙江省国土资源科技研究项目（201507） |
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| 摘 要： | 为探究地下水中腐植酸(HA)和Cd~(2+)复合污染物对黏土胶粒在饱和多孔介质中迁移的影响,本文选择蒙脱石和高岭石两种黏土胶粒作为研究对象,采用同步注射柱实验,在饱和石英砂柱中分别同步注射黏土胶粒与腐植酸、Cd~(2+)或腐植酸+Cd~(2+)混合液,来研究腐植酸和Cd~(2+)与黏土胶粒的共迁移。结果显示:高岭石在石英砂柱中的沉降速度依次为:无Cd~(2+)无腐植酸(3.72 min-1)仅有Cd~(2+)(2.82 min-1)Cd~(2+)与腐植酸共存(2.01 min-1)仅有腐植酸(0.46 min-1);蒙脱石在石英砂柱中的沉降速度依次为:无Cd~(2+)无腐植酸(1.02 min-1)仅有Cd~(2+)(0.97 min-1)Cd~(2+)与腐植酸共存(0.85 min-1)仅有腐植酸(0.30 min-1)。研究结果表明,腐植酸和Cd~(2+)对蒙脱石和高岭石胶粒的迁移效果比较一致,它们均能促进两种黏土胶粒的迁移,促进作用腐植酸最强而Cd~(2+)较弱;腐植酸和Cd~(2+)之间存在拮抗作用,即二者的加合作用反而小于腐植酸单独作用。通过对黏土胶粒的粒径和Zeta电位进行测试分析,可推测腐植酸和Cd~(2+)是通过不同的机理来促进黏土胶粒的迁移:腐植酸通过改变黏土胶粒表面的电性来抑制黏土胶粒的沉降,而Cd~(2+)通过促使黏土胶粒聚凝来降低其沉降。这些发现有助于更好地理解天然土壤胶粒在环境中的迁移和浓度分布。
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| 关 键 词： | 黏土胶粒 Cd2+ 腐植酸 饱和多孔介质 共迁移 |
| 收稿时间： | 2018/1/10 0:00:00 |
Influence of humic acid and cadmium on the transport of clay colloids in saturated porous media |
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| TANG Zhang,YANG Xin-yao,YAN Xin-yu,ZHANG Hai-yan and YANG Yue-suo.Influence of humic acid and cadmium on the transport of clay colloids in saturated porous media[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2019,38(1):111-116. |
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| Authors: | TANG Zhang YANG Xin-yao YAN Xin-yu ZHANG Hai-yan and YANG Yue-suo |
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| Institution: | Key Lab of Eco-restoration of Regional Contaminated Environment Ministry of Education, Shenyang University, Shenyang 110044, China,Key Lab of Eco-restoration of Regional Contaminated Environment Ministry of Education, Shenyang University, Shenyang 110044, China,Key Lab of Eco-restoration of Regional Contaminated Environment Ministry of Education, Shenyang University, Shenyang 110044, China,Hydrogeology and Engineering Geology Exploration Institute of Heilongjiang Province, Haerbin 150030, China and Key Lab of Eco-restoration of Regional Contaminated Environment Ministry of Education, Shenyang University, Shenyang 110044, China;Key Laboratory of Groundwater Environment and Resources, Ministry of Education, Jilin University, Changchun 130021, China |
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| Abstract: | With the aim to explore the impact of humic acid(HA) and cadmium ion(Cd2+) on the transport of clay colloids in saturated porous 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 similar trend in changing deposition rate in response to the variability of Cd2+ 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 colloids; HA and Cd2+ both promoted the transport of the two clay colloids. The effect of HA was stronger than that of Cd2+. Moreover, an antagonistic 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 mobility 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. |
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| Keywords: | clay colloids Cd2+ HA saturated quartz sand co-transport |
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