基于银汞齐抑制三角纳米银刻蚀比色法检测水中汞离子
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摘要
构建了一种基于汞离子存在下,银汞齐的形成抑制了三角纳米银被氯离子刻蚀的比色法检测水中汞离子的方法。当汞离子不存在时,由于氯离子的刻蚀,纳米银的形状由三角形纳米盘变成圆盘,溶液颜色由蓝色变成黄色。当汞离子存在时,汞离子被还原成汞原子强烈吸附在纳米三角银表面,汞充当纳米三角银的保护剂,抑制了氯离子对纳米三角银的刻蚀。随着汞离子浓度的增大,纳米三角银在450 nm处表面等离子共振峰发生红移,并伴随着颜色从黄色变为棕色,紫色,最后变为蓝色。在最佳反应条件下,该方法的线性范围为5~100 nmol/L,检出限为0.83 nmol/L。其它重金属离子对汞离子检测无干扰。将该方法用于实际水样中汞离子的检测,得到了满意的结果。
A highly specific and sensitive colorimetric method for Hg~(2+)detection,based on the inhibition of triangular Ag nanoprisms( tri-AgNPs) from being etched by chloride ion in the presence of Hg~(2+)was presented. In the absence of Hg~(2+),owing to etching by chloride,the shape of the triAgNPs is changed from triangle nanoplates to round nanodisks,along with the solution color change from blue to yellow. In the presence of Hg~(2+),Hg~(2+)is reduced to Hg,which is strongly adsorbed on the surface of tri-AgNPs and thereby acts as a protective agent. To prevent the etching by chloride ion,a gradual red shift of the surface plasmon resonance( SPR) absorption band at 450 nm and a distinct color change of the tri-AgNPs from yellow to brown,purple,and blue is observed as the concentration of Hg~(2+)increases. Under the optimum reaction conditions,the linear detection range of the method is 5 ~ 100 nmol/L with the limit of detection as low as 0. 83 nmol/L. Otherwise,there is almost no interference from other heavy metal ions. The method is applied in detection of real water samples,and satisfactory results are obtained. This method has the advantages of simplicity,sensitivity and low cost.
A highly specific and sensitive colorimetric method for Hg~(2+)detection,based on the inhibition of triangular Ag nanoprisms( tri-AgNPs) from being etched by chloride ion in the presence of Hg~(2+)was presented. In the absence of Hg~(2+),owing to etching by chloride,the shape of the triAgNPs is changed from triangle nanoplates to round nanodisks,along with the solution color change from blue to yellow. In the presence of Hg~(2+),Hg~(2+)is reduced to Hg,which is strongly adsorbed on the surface of tri-AgNPs and thereby acts as a protective agent. To prevent the etching by chloride ion,a gradual red shift of the surface plasmon resonance( SPR) absorption band at 450 nm and a distinct color change of the tri-AgNPs from yellow to brown,purple,and blue is observed as the concentration of Hg~(2+)increases. Under the optimum reaction conditions,the linear detection range of the method is 5 ~ 100 nmol/L with the limit of detection as low as 0. 83 nmol/L. Otherwise,there is almost no interference from other heavy metal ions. The method is applied in detection of real water samples,and satisfactory results are obtained. This method has the advantages of simplicity,sensitivity and low cost.
引文
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[6]Du J J,Yin S Y,Jiang L,et al.,Chem.Commun.,2013,49(39):4196
[7]Wang G L,Zhu X Y,Jiao H J,et al.,Biosens.Bioelectron.,2012,31(1):337
[8]Wang C I,Huang C C,Lin Y W,et al.,Anal.Chim.Acta,2012,745,124
[9]Dong Z,Li Y,Xie L J,et al.Chin J Anal Lab,2016,35(12):1398董哲,李阳,谢立娟,等.分析试验室,2016,35(12):1398
[10]Metraux G S,Mirkin C A.Adv.Mater.,2005,17(4):412
[11]Li Y L,Li Z H,Gao Y X,et al.,Nanoscale,2014,6(18):10631
[12]Sener G,Uzun L,Denizli A.Anal.Chem.,2014,86(1):514
[13]Gu Z,Zhao MX,Sheng YW,et al.,Anal.Chem.,2011,83(6):2324
[14]Wang Y W,Wang L X,An F P,et al.,Anal.Chim.Acta,2017,980,72
[15]Liu D B,Qu W S,Chen W W,et al.,Anal.Chem.,2010,82(23):9606
[16]Zhang H,Xia Y S.ACS Sens.,2016,1(4):384
[17]Kumar V V,Anthony S P.Sens.Actuators,B,2016,225:413
[18]Deng L,Ouyang X Y,Jin J Y,et al.,Anal.Chem.,2013,85(18):8594