CAJ | 학술논문

在Britton-Robinson（BR）（pH 为9．0）缓冲介质中，微量 Hg（Ⅱ）离子能诱使被巯基乙酸钠包被的AuNPs发生聚集，以此诱发局域表面等离子体共振（localized surface plasmon resonance，LSPR）散射峰的出现，随着 Hg（Ⅱ）浓度的不断增加，体系在548 nm的LSPR散射信号显著增强，其散射强度与 Hg（Ⅱ）的浓度具有相关性，且在0．08～0．8μmol·L-1范围内呈现一定的线性关系，由此构建了以 Hg（Ⅱ）为目标分析物的LSPR散射分析检测方法，检测限为8 nmol·L-1。研究了体系的LSPR散射光谱以及吸收光谱，利用扫描电镜考察了AuNPs与 Hg（Ⅱ）反应前后粒径的变化情况，发现单独的AuNPs呈现良好的分散状态，当加入 Hg（Ⅱ）后，AuNPs呈现聚集状态。同时探讨了体系反应机理，结果表明Hg（Ⅱ）的加入与AuNPs表面的羧基发生螯合作用诱导了AuNPs的聚集。考察了体系对金属离子 Hg（Ⅱ）的选择性，实验中选择了一系列的金属离子与AuNPs作用，其结果表明 Hg（Ⅱ）与AuNPs作用的LSPR散射信号增强效果最为明显，而其余离子即使在浓度较高时其LSPR散射强度依然较弱，说明了实验设计方案对 Hg（Ⅱ）具有优异的选择性。此外，研究了体系酸度，离子强度以及稳定剂对体系的影响。实验所建立起来的方法操作简单，分析速度快速，检测灵敏度较高。该方法已经成功用于环境水样中痕量 Hg（Ⅱ）的检测。
재Britton-Robinson（BR）（pH 위9．0）완충개질중，미량 Hg（Ⅱ）리자능유사피구기을산납포피적AuNPs발생취집，이차유발국역표면등리자체공진（localized surface plasmon resonance，LSPR）산사봉적출현，수착 Hg（Ⅱ）농도적불단증가，체계재548 nm적LSPR산사신호현저증강，기산사강도여 Hg（Ⅱ）적농도구유상관성，차재0．08～0．8μmol·L-1범위내정현일정적선성관계，유차구건료이 Hg（Ⅱ）위목표분석물적LSPR산사분석검측방법，검측한위8 nmol·L-1。연구료체계적LSPR산사광보이급흡수광보，이용소묘전경고찰료AuNPs여 Hg（Ⅱ）반응전후립경적변화정황，발현단독적AuNPs정현량호적분산상태，당가입 Hg（Ⅱ）후，AuNPs정현취집상태。동시탐토료체계반응궤리，결과표명Hg（Ⅱ）적가입여AuNPs표면적최기발생오합작용유도료AuNPs적취집。고찰료체계대금속리자 Hg（Ⅱ）적선택성，실험중선택료일계렬적금속리자여AuNPs작용，기결과표명 Hg（Ⅱ）여AuNPs작용적LSPR산사신호증강효과최위명현，이기여리자즉사재농도교고시기LSPR산사강도의연교약，설명료실험설계방안대 Hg（Ⅱ）구유우이적선택성。차외，연구료체계산도，리자강도이급은정제대체계적영향。실험소건립기래적방법조작간단，분석속도쾌속，검측령민도교고。해방법이경성공용우배경수양중흔량 Hg（Ⅱ）적검측。
Heavy-metal ions pose severe risks for human health and the environment. In particular,mercury-based pollutants are of great environmental concern because of the high toxicity of many Hg compounds. It is important to monitor the levels of po-tentially toxic metal Hg(Ⅱ)in aquatic ecosystems. Gold nanoparticles (AuNPs)as nanomaterials have been generally studied. It is because their unique electrical,chemical,optical,and catalytic properties,AuNPs have caused widespread interest for ap-plications in biological and chemical analysis and detection. In the present work,the authors took advantage of the aggregation-induced localized surface plasmon resonance (LSPR)light scattering signal change of sodium thioglycolate functionalized AuNPs in aqueous solutions to develop a highly efficient optical sensor for Hg(Ⅱ). The as-modified AuNPs demonstrate that high nega-tive charge densities exist on their surfaces at pH 9. 0 Britton-Robinson (BR)buffer solution.The AuNPs occur aggregate in so-lution through chelation in the presence of Hg(Ⅱ). The scanning electron microscope (SEM)images for the AuNPs display typ-ical shapes of these AuNPs as regular and almost individual spherical particles. The color change of the AuNPs solution was in-duced by the addition of Hg(Ⅱ)and it immediately changed from red to purple due to the aggregation. Under optimum condi-tions,a good linear relationship was obtained from 0. 08 to 0. 8μmol·L-1 with a correlation coefficient of 0. 997 6,and the limit of detection (LOD)was 8. 0 nmol·L-1. PEG20000 was employed as a system stabilizer. The proposed method has an excellent selectivity for Hg(Ⅱ)in aqueous medium over other metal ions. The optimum test of reaction conditions,including the amount of AuNPs,pH value,reaction stability and ionic strength,were also investigated. This method has been used for determination of Hg(Ⅱ)successfully in environmental water sample. This approach manifested several advantages including short analysis time,high sensitivity,low cost,excellent selectivity and ease of operation.