CAJ | 학술논문

纳米Ag的大量生产和使用增加了其进入土壤环境的风险，其在土壤中的环境行为受纳米Ag胶体稳定性和土壤理化性质的影响。为探究纳米Ag颗粒在土壤上的吸附行为，选取四种不同理化性质的土壤，考察了土壤pH、有机质和二价阳离子Ca2+对纳米Ag在土壤上吸附的影响。结果表明，纳米Ag在酸性土壤的吸附量高于中性土壤，当土壤酸碱性相似时土壤有机质含量越高纳米Ag在其表面的吸附量越高，纳米Ag在四种土壤上的吸附等温线都能较好地利用Freundlich方程进行拟合；Ca2+的存在均增加了纳米Ag在四种土壤上的吸附量，Ca2+浓度在0.1~10 mmol·L-1范围内，纳米Ag在中性土壤上的吸附量随Ca2+浓度的增加而增加，而在酸性土壤上则随着Ca2+浓度的增加，出现先增加后减小的趋势。这一结果有助于了解纳米银在不同性质土壤上的吸附行为，为评价纳米Ag在环境中的毒性和生态风险提供了有用信息。
납미Ag적대량생산화사용증가료기진입토양배경적풍험，기재토양중적배경행위수납미Ag효체은정성화토양이화성질적영향。위탐구납미Ag과립재토양상적흡부행위，선취사충불동이화성질적토양，고찰료토양pH、유궤질화이개양리자Ca2+대납미Ag재토양상흡부적영향。결과표명，납미Ag재산성토양적흡부량고우중성토양，당토양산감성상사시토양유궤질함량월고납미Ag재기표면적흡부량월고，납미Ag재사충토양상적흡부등온선도능교호지이용Freundlich방정진행의합；Ca2+적존재균증가료납미Ag재사충토양상적흡부량，Ca2+농도재0.1~10 mmol·L-1범위내，납미Ag재중성토양상적흡부량수Ca2+농도적증가이증가，이재산성토양상칙수착Ca2+농도적증가，출현선증가후감소적추세。저일결과유조우료해납미은재불동성질토양상적흡부행위，위평개납미Ag재배경중적독성화생태풍험제공료유용신식。
Large amount of silver nanoparticles(AgNPs)are being used in a wide range of aspects, which exhibited great risk to soil envi-ronment. The environmental fates of AgNPs in soil are markedly affected by AgNP stability and soil physicochemical properties. In this study,isothermal sorption of AgNPs on four types of soils with different physicochemical properties was investigated in the presence and the absence of Ca2+. The sorption isotherms of AgNPs on soils were well described with Freundlich isotherm equation. Soil pH and organic matter significantly affected the sorption of AgNPs by soils. The sorption amount of AgNPs on the acid soils was higher than that on the neutral soils. At the same soil pH,soil organic matter increased the AgNPs sorption capacity. The presence of Ca2+generally increased the sorption capacity of AgNPs on these soils, but such effect showed slight difference between neutral and acid soils. In neutral soil, AgNPs sorption ca-pacity increased with increasing Ca2+concentrations from 0.1 mmol·L-1 to 10 mmol·L-1, whereas in acidic soil the sorption capacity showed“first increase and then decrease”over Ca concentrations. These results would be beneficial for environmental risk assessment of AgNPs.