Abstract：The carbon quantum dots were prepared by hydrothermal method with glucose as carbon source. Then its surface amination was conducted with ethanediamine. On the basis of fact that the fluorescence of aminated carbon quantum dots could be quenched by copper ions, a new determination method of trace copper by fluorescence quenching method was established. 1.0 mL of aminated carbon quantum dots, the copper ion solution with various concentrations and 1.0 mL of phosphate buffer solution at pH 7.7 were added into colorimetric tube. The solution was diluted to 5 mL with water. After the solution was mixed uniformly and reaction at room temperature for 20 min, the relative fluorescence intensity of testing system at the maximum excitation/emission wavelength of 465 nm/522 nm (λex/λem) was measured. The results showed that the concentration of copper ion in range of 4.0×10-6-3.8×10-5 mol/L was linear to its corresponding relative fluorescence intensity. The correlation coefficient was 0.994 6. The detection limit was 4.5×10-7 mol/L. The proposed method was applied to the determination of trace copper in the local irrigation water sample and arable soil sample. The results were consistent with those obtained by atomic absorption spectrometry(AAS). The relative standard deviations (RSD, n=5) were 3.2% and 2.3%. The recoveries were between 92% and 108%.
刘建波,张萍,范广,等.微波消解样品-火焰原子吸收光谱法测定美白化妆品中铅和铜[J].理化检验:化学分册,2011,47(5):520-522.LIU Jian-bo,ZHANG Ping,FAN Guang,et al.FAAS determination of lead and copper in whitening cosmetics with microwave assisted sample digestion[J].Physical Testing and Chemical Analysis Part B:Chemical Analysis,2011,47(5):520-522.
[2]
于刚,秦朋,陈丕茂,等.微波消解-石墨炉原子吸收光谱法测定壳聚糖膜中铜离子含量[J].食品科学,2015,36(2):201-203.YU Gang,QIN Peng,CHEN Pi-mao,et al.Atomic absorption spectrophotometry determination of copper ion in chitosan membrane by microwave digestion and graphite furnace[J].Food Science,2015,36(2):201-203.
[3]
陈金忠,陈凤玲,丁振瑞,等.电感耦合等离子体原子发射光谱法测定自来水中铜汞和铅[J].理化检验:化学分册,2011,47(2):417-418.CHEN Jin-zhong,CHEN Fen-ling,DING Zhen-rui,et al.ICP-AES determination of copper mercury and lead in tap water[J].Physical Testing and Chemical Analysis Part B:Chemical Analysis,2011,47(2):417-418.
[4]
葛昌华,潘富友,梁华定,等.2,7-双(5-羧基-1,3,4-三氮唑偶氮)-H酸和过氧化氢催化动力学光度法测定痕量铜的研究[J].冶金分析,2011,31(5):49-52.GE Chang-hua,PAN Fu-you,LIANG Hua-ding,et al.Catalytic kinetic spctrophotometric determination of trace copper with 2,7-bi(5-carboxy-1,3,4-triazole)-H acid and hydrogen peroxide[J].Metallurgical Analysis,2011,31(5):49-52.
[5]
尹赫南,戴伟建,张思宝,等.CdTe量子点-双硫腙荧光开关测定铜[J].冶金分析,2013,33(7):21-24.YIN He-nan,DAI Wei-jian,ZHANG Si-bao,et al.Determination of copper based on fluorescence switch of CdTe quantum dots-dithizone[J].Metallurgical Analysis,2013,33(7):21-24.
[6]
王佳佳,连曼,熊杰,等.新型水溶性咪唑基硅量子点制备及用于果蔬中痕量铜的荧光检测[J].分析化学,2016,44(3):367-376.WANG Jia-jia,LIAN Man,XIONG Jie,et al.Synthesis of novel water-soluble silicon quantum dots with imidazole groups and its application in fluorescent detection of trace copper in fruits and vegetables[J].Chinese Journal of Analytical Chemistry,2016,44(3):367-376.
[7]
李敏,孔慧芳,郭志慧.基于铜离子与DNA相互作用的铜离子检测[J].高等学校化学学报,2016,37(7):1269-1275.LI Min,KONG Hui-fang,GUO Zhi-hui.Detection of copper ion based on the interaction between DNA molecules and copper ions[J].Chemical Journal of Chinese Universities,2016,37(7):1269-1275.
[8]
侯国忠,焦晨旭,王磊,等.对叔丁基杯
[4]
芳烃修饰碳糊电极测定痕量铜[J].现代化工,2016,36(10):184-188.HOU Guo-zhong,JIAO Chen-xu,WANG Lei,et al.Determination of Cu2+ in carbon paste electrode modified by p-tert-butyl-calix
[4]
arene[J].Modern Chemical Industry,2016,36(10):184-188.
[9]
娄庆,曲松楠.基于超级碳点的水致荧光“纳米炸弹”[J].中国光学,2015,8(1):91-98.LOU Qing,QU Song-nan.Water triggered luminescent "nano-bombs" based on supra-carbon-nanodots[J].Chinese Optics,2015,8(1):91-98.
王莉,吕婷,阮枫萍,等.水热法制备的荧光碳量子点[J].发光学报,2014,35(6):706-709.WANG Li,L Ting,RUAN Feng-ping,et al.Synthesis of photoluminescent carbon nanoparticles by hydrothermal method[J].Chinese Journal of Luminescence,2014,35(6):706-709.
