巯基乙酸修饰的CdTe量子点荧光光度法测定赤泥中痕量镍.pdf

第27卷第7期
化学研究与应用
Vol.27、No.7
2015年7月
Chemical Research and A pplication
July, 2015
文章编号:1004-1656(2015)07-1024-05
巯基乙酸修饰的CdTe量子点荧光光度法测定
赤泥中痕量镍
罗道成2*,罗铸
(1.湖南科技大学化学化工学院,湖南湘潭411201;
2.煤炭清洁利用与矿山环境保护湖南省重点实验室,湖南湘潭411201)
摘要:用巯基乙酸(TGA)作稳定剂,采用水相合成法制备了巯基乙酸修饰的 Cdte量子点(TGA- Cdte QDS)。
基于镍离子在pH10.0的Na2BO,缓冲溶液中对Cdre量子点的荧光具有较强的猝灭作用,建立了一种测定
镍离子的荧光光度方法。结果表明,在最佳试验条件下,镍离子浓度在2.0x10~mlL1-7.8x10°mol·L'范
围内与CdTe量子点的相对荧光强度呈良好的线性关系,其线性回归方程为△F=1.0089+0.0308c(pml
L),相关系数r=0.9987,检出限1.5x107molL。样品中的镍经2-羟基4-仲辛氧基二苯甲酮肟(NS30)磺
化煤油萃取分离后,大多数常见离子不干犹测定。方法应用于赤泥中痕量镍的测定,測定结果与催化光度法
相符,加标回收率在98.3%~104.2%之间
关键词;CdTe量子点;镍;荧光光度法;豌基乙酸;赤泥
中图分类号:0657.3文献标志码;A
Fluorophotometric determination of trace nickel
in red mud with thioglycolic acid modified Cdte quantum dots
LUO Dao-cheng
LUO Zh
2. Hunan Provincal Key Laboratory of Clean Coal and Mine Environmental Protection, Xiangtan 411201, H)ina
(I School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Ch
Abstract: Thioglycolic acid(TGA) modified C Te quan um dots(tga-cdte QDS)of high fluorescence was prepared in aqueous so-
lu ion with thioglycolic acid as stabilizer. A new fluorophotometric method for the determination of nickel ions was developed based
on the strongger fluorescence quenching effect of Cdte QDS inna B, 0, buffer solution of PH 10. 0. The results showed that the rela
tive fluorescence intensity of Cdte quantum dot was proportional to the concentration of nickel ions in the range of 2.0x 10 mol
I 1-7.8x 10mol-i the linear regression equation was A F=1.089+.0308 c(umol L, ) the correlation coeficient was
0.9987, and the detection limit was 1.5 x 10 mol under optimal ximen al conditions. After nickel in samples having
been extracted and separated with solvent of N530-coal oil sulfonated, most common ions would not interfere with the analytical re-
sults. The proposed method have been applied to the determination of trace nickel in red mud, the determination results were con
sistent with those obtained by catalytic spectrophotometric method, and the recoveries of standard addition were 98.3%0-104. 29
Key words: Cdte quantum dots nickel; fluorophotometry; thioglycolic acid; red mud
收稿日期;2014-12-01;修回日期:2015-0201
联系人简介:罗道成(1967-),男,教授,主要从事化学工程和分析化学研究。E-mail:luodaocheng21e126.com