文章摘要
王道涵, 李泽龙, 汤家喜.东乌珠穆沁旗草原砂土对汞的吸附特征及其影响因素[J].水土保持学报,2019,33(1):301~305
东乌珠穆沁旗草原砂土对汞的吸附特征及其影响因素
Adsorption Characteristics and Influencing Factors of Mercury in Sandy Soil of Dong Ujimqin Banner Prairie
投稿时间:2018-08-22  
DOI:10.13870/j.cnki.stbcxb.2019.01.047
中文关键词: 氯化汞  砂土  吸附
英文关键词: mercuric chloride  sandy soil  adsorption
基金项目:国家自然科学基金项目(41501548);辽宁省教育厅科学技术研究项目(LJYL021);大学生创新训练项目(201710147000014,201710147000215)
作者单位E-mail
王道涵, 李泽龙, 汤家喜 辽宁工程技术大学环境科学与工程学院, 辽宁 阜新 123000 tangjiaxi1986@163.com 
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中文摘要:
      以东乌珠穆沁旗的草原砂土为研究对象,采用正交试验设计的方法,研究了土壤/溶液(固/液)、初始汞浓度、溶液pH、腐殖酸、硝酸钠浓度对东乌珠穆沁旗草原砂土吸附HgCl2的影响。结果表明:固/液越小,初始汞浓度越大,土壤吸附能力越强;土壤对汞的吸附量随溶液pH,外源腐殖酸浓度,硝酸钠浓度的增大而呈现先增大后减小的趋势,当溶液pH为7.5,外源腐殖酸浓度为0.6 mg/g,硝酸钠浓度为0.08 mg/L时,土壤对汞的吸附量分别达到最大。影响砂土吸附HgCl2的因素大小依次为初始汞浓度 > 固/液 > pH > 硝酸钠浓度 > 腐殖酸浓度。草原地区砂土对汞的吸附动力学过程与Lagergren准二级动力学模型拟合有较好的相关性,表明该吸附过程主要以化学吸附为主,且吸附过程不可逆。
英文摘要:
      Taking the grassland sandy soil of East Wuzhumuqi as the research object, and simulating mercury deposition, orthogonal experiment was adopted. The effects of soil/solution ratio, initial mercury concentration, pH, humic acid and concentration of sodium nitrate on the adsorption of grassland sandy soil for HgCl2 were studied through the method of orthogonal experimental design. The mercury determination in soil were determined by water bath digestion atomic fluorescence spectrometry. The results showed that the smaller the soil/solution ratio was, the larger the initial mercury concentration and the stronger the soil adsorption capacity. The amount of mercury adsorbed by soil was affected by the amount of humic acid, the concentration of sodium nitrate and solvent pH, and the adsorption amount increased first and then decreased with the increasing of the above three factors. When the solvent pH was 7.5, the concentration of exogenous humic acid was 0.6 mg/g and the concentration of sodium nitrate was 0.08 mg/L, the soil adsorption capacity reached the maximum. The factors affected the adsorption of sand for HgCl2 followed the order of initial mercury concentration > soil/solution ratio > pH > sodium nitrate concentration > humic acid content. Fitting experimental data showed that the accumulation behavior of mercury in sandy soil accorded with the adsorption kinetics process and well correlated with Lagergren quasi-second-order kinetic model, which indicated that the adsorption process was mainly chemical adsorption and the adsorption process was irreversible.
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