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首页> 外文期刊>Microchemical Journal: Devoted to the Application of Microtechniques in all Branches of Science >Inhibition of rhodamine B-ferricyanide chemiluminescence by Au nanoparticles toward the sensitive determination of mercury (II) ions
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Inhibition of rhodamine B-ferricyanide chemiluminescence by Au nanoparticles toward the sensitive determination of mercury (II) ions

机译：金纳米粒子对罗丹明B-铁氰化物化学发光的抑制对汞（II）离子的灵敏测定

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摘要

A new high sensitive, selective, and simple method based on the inhibited effect of gold nanoparticles (Au NPs) on rhodamine B (RB)-ferricyanide (Fe(CN)(6)(3-)) chemiluminescence (CL) system has been developed for the determination of Hg2+ in environmental samples. This study is the analytical exploiting of Au NPs inhibiting effect on CL system. RB-Fe(CN)(6)(3-) causes a high emission intensity in alkaline condition but undergoes an intense extinction in the presence of Au NPs. This decreasing effect can be attributed to the energy transfer and collisions between RB molecules and Au NPs. Moreover, it is observed that the CL intensity is gradually restored in the presence of mercury (II) due to RB molecules release from the surfaces of Au NPs. Based on this effect, sensitive, and selective turn-on CL assay was developed for the determination of Hg2+. Under the optimized conditions, CL calibration curve was drawn as a function of Hg2+ concentration, which is linear over the range of 0.013-4.67 mu g L-1 (0.067-233 nmol L-1) with limit of detection (3s) and quantification (10s) of 5.42 and 18 ng L-1, respectively. The relative standard deviations (RSD%, n = 5) were about 0.7-2.1% for the different concentrations of Hg2+. The presented assay was satisfactorily applied to the quantification of Hg2+ in the environmental (tap, rain, and river) water samples, which shows good sensitivity and reliability in comparison with the other nanoparticle-based methods; the recoveries were 97-102%. (C) 2015 Elsevier B.V. All rights reserved.
机译：一种基于金纳米颗粒（Au NPs）对若丹明B（RB）-铁氰化物（Fe（CN）（6）（3-））化学发光（CL）系统的抑制作用的高灵敏，选择性，简单的新方法用于测定环境样品中的Hg2 +。这项研究是对Au NPs对CL系统的抑制作用的分析开发。 RB-Fe（CN）（6）（3-）在碱性条件下会导致高发射强度，但在Au NPs的存在下会强烈熄灭。这种降低的作用可以归因于RB分子和Au NP之间的能量转移和碰撞。此外，观察到由于RB分子从Au NPs的表面释放，在汞（II）存在下CL强度逐渐恢复。基于此效应，开发了灵敏的选择性开启CL分析法来测定Hg2 +。在最佳条件下，绘制了作为Hg2 +浓度的函数的CL校准曲线，该曲线在0.013-4.67μg L-1（0.067-233 nmol L-1）的范围内呈线性，检测限为（3s）和定量（10s）分别为5.42和18 ng L-1。对于不同浓度的Hg2 +，相对标准偏差（RSD％，n = 5）约为0.7-2.1％。提出的测定方法可令人满意地用于环境（自来水，雨水和河流）水样中Hg2 +的定量，与其他基于纳米颗粒的方法相比，该方法显示出良好的灵敏度和可靠性;回收率为97-102％。 （C）2015 Elsevier B.V.保留所有权利。

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