基于溴化氢诱导下纳米金氧化刻蚀比色法检测六价铬
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摘要
设计了一种基于纳米金被六价铬氧化刻蚀的高灵敏度、高专一性的比色传感器来检测六价铬。当溴化氢存在时,由能斯特方程得到Cr6+/Cr3+的标准电势高于Au+/Au的标准电势。因此,当六价铬存在时,纳米金被刻蚀成小粒径的纳米粒子,导致在520 nm处的吸光度不断降低,650 nm处的吸光度则不断增大。六价铬的浓度在0.1~100μmol/L范围内,对数值与吸光度变化值呈良好的线性关系,线性方程为y=0.083 32x+0.082 86,相关系数R为0.99,检出限为0.06μmol/L,其他金属离子几乎不存在干扰。本方法用于自来水样品中六价铬的测定,实验结果令人满意。
A highly sensitive and specific colorimetric sensor for Cr(Ⅵ) detection based on the oxidation etching of gold nanoparticles by Cr(Ⅵ) was designed. In the presence of hydrogen bromide,based on the Nernst equation,the electron potential of Cr(Ⅵ)/Cr(Ⅲ) is higher than that of Au(I)/Au(0).Thus,the gold nanoparticles are etched to nanoparticles with smaller particle size,which leads to the gradual decrease of the absorbance value at 520 nm,and the gradual increase of the absorbance value at 650 nm.There is a good linear relationship between the absorbance change and the logarithm of the Cr(Ⅵ) concentrations in the range of 0. 1 ~ 100 μmol/L.Its regression equation is y = 0. 083 32 x+0. 082 86,and the correlation coefficient is 0. 99,with a low detection limit of 0. 06 μmol/L,and there is almost no interference from other metal ions.The method is applied to the detection of Cr(Ⅵ) in tap water with a satisfactory result.
A highly sensitive and specific colorimetric sensor for Cr(Ⅵ) detection based on the oxidation etching of gold nanoparticles by Cr(Ⅵ) was designed. In the presence of hydrogen bromide,based on the Nernst equation,the electron potential of Cr(Ⅵ)/Cr(Ⅲ) is higher than that of Au(I)/Au(0).Thus,the gold nanoparticles are etched to nanoparticles with smaller particle size,which leads to the gradual decrease of the absorbance value at 520 nm,and the gradual increase of the absorbance value at 650 nm.There is a good linear relationship between the absorbance change and the logarithm of the Cr(Ⅵ) concentrations in the range of 0. 1 ~ 100 μmol/L.Its regression equation is y = 0. 083 32 x+0. 082 86,and the correlation coefficient is 0. 99,with a low detection limit of 0. 06 μmol/L,and there is almost no interference from other metal ions.The method is applied to the detection of Cr(Ⅵ) in tap water with a satisfactory result.
引文
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[15]XIN Jun-wei,ZHANG Fu-qiang,GAO Yue-xia.A rapid colorimetric detection method of trace Cr(Ⅵ)based on the redox etching of Agcore-Aushellnanoparticles at room temperature[J].Talanta,2012,101(1):122-127.
[2]LY N H,OH C H,JOO S W.A submicromolar Cr(Ⅲ)sensor with a complex of methionine using gold nanoparticles[J].Sens.Actuators B-Chem.,2015,219:276-282.
[3]YE Jia-hai,WANG Yi-xin,BAI Yang.A highly selective turn-on fluorescent chemodosimeter for Cr(Ⅵ)and its application in living cell imaging[J].RSC Adv.,2014,4(6):2 989-2 992.
[4]SUI Chao-xia,LIU Ying-fan,ZHANG Wen-hao.Cd TeCd Se nanocrystals capped with dimethylaminoethanethiol as ultrasensitive fluorescent probes for chromium(Ⅵ)[J].Microchim.Acta,2014,181(3/4):347-353.
[5]徐根良,肖不松,肖敏.重金属废水处理技术综述[J].水处理技术,1991,17(2):77-86.
[6]WANG Hua-jian,DU Xian-mei,WANG Meng.Using ionpair reversed-phase HPLC ICP-MS to simultaneously determine Cr(Ⅲ)and Cr(Ⅵ)in urine of chromate workers[J].Talanta,2010,81(4/5):1 856-1 860.
[7]HOSSEINI M,GUPTA V K,GANJALI M R.A novel dichromate-sensitive fluorescent nano-chemosensor using new functionalized SBA-15[J].Anal.Chim.Acta,2012,715(1):80-85.
[8]KORSHOJ L E,ZAITOUNA A J,LAI R Y.Methylene blue-mediated electrocatalytic detection of hexavalent chromium[J].Anal.Chem.,2015,87(5):2 560-2 564.
[9]YOUSEFI S M,SHEMIRANI F.Selective and sensitive speciation analysis of Cr(Ⅵ)and Cr(Ⅲ)in water samples by fiber optic-linear array detection spectrophotometry after ion pair based-surfactant assisted dispersive liquid-liquid microextraction[J].J.Hazard.Mater.,2013,254/255(1):134-140.
[10]HOSSEINI M S,BELADOR F.Cr(Ⅲ)/Cr(Ⅵ)Speciation determination of chromium in water samples by luminescence quenching of quercetin[J].J.Hazard.Mater.,2009,165(1):1 062-1 067.
[11]ZHENG Min,XIE Zhi-gang,QU Dan.On-off-on fluorescent carbon dot nanosensor for recognition of chromium(Ⅵ)and ascorbic acid based on the inner filter effect[J].ACS Appl.Mater.Interf.,2013,5(24):13 242-13 247.
[12]LEE J S,HAN Ming-su,MIRKIN C A.Colorimetric detection of mercuric ion(Hg2+)in aqueous media using DNA-functionalized gold nanoparticles[J].Angew.Chem.Int.Ed.,2007,46(22):4 093-4 096.
[13]LIU Xiao-jun,WU Zhang-jian,ZHANG Qing-quan.Single gold nanoparticle-based colorimetric detection of picomolar mercury ion with dark-field microscopy[J].Anal.Chem.,2016,88(4):2 119-2 124.
[14]TURKEVICH J,STEVENSON P C,HILLIER J.A study of the nucleation and growth processes in the synthesis of colloidal gold[J].Discuss.Faraday Soc.,1951,11(1):55-75.
[15]XIN Jun-wei,ZHANG Fu-qiang,GAO Yue-xia.A rapid colorimetric detection method of trace Cr(Ⅵ)based on the redox etching of Agcore-Aushellnanoparticles at room temperature[J].Talanta,2012,101(1):122-127.