基于银离子复合多壁碳纳米管修饰电极测定砖茶中的痕量氟
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摘要
制备了银离子复合多壁碳纳米管修饰玻碳电极,并用于测定砖茶中的氟含量。采用循环伏安法、线性扫描伏安法对修饰电极进行表征。Fe_2(SO_4)_3-NaF在修饰电极上显示出较好的电化学活性。对电解液pH、共存离子、扫描速率等实验条件进行了优化测试。在最佳条件下,电流响应与F-在5×10~(-4)～1×10~(-7)mol/L(R~2=0. 973 8)范围内呈线性关系,检出限为7. 8×10~(-8)mol/L(S/N=3)。用于砖茶样品的测定,回收率在94. 8%～102. 1%之间。
A novel silver ion and multi-walled carbon nanotubes composite modified glassy carbon electrode( AgMWNT/GCME) is prepared for determining trace fluoride in brick tea. Ag-MWNT/GCME is characterized by cyclic voltammetry( CV) and linear sweep voltammetry( LSV).Fe_2(SO_4)_3-NaF exhibits good electrochemical activity on AgMWNT/GCME.Experimental conditions,including electrolyte p H,coexisting ions and scanning rate are studied and optimized.Under the optimal conditions,there exists linear relationship between the current response and the logarithm concentration of F-in the range from 5×10~(-4) to 1×10~(-7) mol·L-1( R~2= 0. 973 8),with a detection limit of 7. 8×10~(-8) mol·L-1( S/N= 3).The average recovery of F-in the detection of brick tea ranges from 94. 8% to 102. 1%.
A novel silver ion and multi-walled carbon nanotubes composite modified glassy carbon electrode( AgMWNT/GCME) is prepared for determining trace fluoride in brick tea. Ag-MWNT/GCME is characterized by cyclic voltammetry( CV) and linear sweep voltammetry( LSV).Fe_2(SO_4)_3-NaF exhibits good electrochemical activity on AgMWNT/GCME.Experimental conditions,including electrolyte p H,coexisting ions and scanning rate are studied and optimized.Under the optimal conditions,there exists linear relationship between the current response and the logarithm concentration of F-in the range from 5×10~(-4) to 1×10~(-7) mol·L-1( R~2= 0. 973 8),with a detection limit of 7. 8×10~(-8) mol·L-1( S/N= 3).The average recovery of F-in the detection of brick tea ranges from 94. 8% to 102. 1%.
引文
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[26]黄压压.泾渭茯砖茶水溶性氟浸出量研究[J].食品科技,2013,38(2):83-85.
[2]王茹茹,肖孟超,李大祥,等.黑茶品质特征及其健康功效研究进展[J].茶叶科学,2018,38(2):113-124.
[3]蒋金星,何华锋,桂安辉,等.中国黑茶的起源与加工工艺[J].中国农学通报,2017,33(25):70-75.
[4]刘建宇,刘丹,张辉,等.安化黑茶化学成分及药理活性研究进展[J].中草药,2017,48(7):1449-1457.
[5]施莉婷,江和源,张建勇,等.茶叶香气成分及其检测技术研究进展[J].食品工业科技,2018,39(12):347-351.
[6]杨金燕,苟敏.中国土壤氟污染研究现状[J].生态环境学报,2017,26(3):506-513.
[7]杨成,罗绪强,王娅,等.大气污染影响下凯里植物、土壤氟含量特征[J].中国农学通报,2012,28(19):76-79.
[8]钟秋生,林郑和,陈常颂,等.不同品种茶树对氟富集的差异研究[J].茶叶通讯,2018,45(1):20-23.
[9]马立锋,石元值,阮建云,等.我国茶叶氟含量状况研究[J].农业环境科学学报,2002,21(6):537-539.
[10]董璐,陈伟,姚培杰,等.西安市氟中毒病区水氟含量与儿童氟斑牙和龋齿的关系[J].中国学校卫生,2018,39(1):101-103.
[11]戴力维.饮水氟含量与人体健康[J].中国城乡企业卫生,2017,32(11):30-33.
[12]王波涛.地方性氟中毒患者血清化学元素及血清酶含量研究[J].中国地方病防治杂志,2016,31(2):185-186.
[13]张卫江,王祥梅,徐姣.氟离子选择电极法测定氟化锂含量[J].现代化工,2015,35(12):165-167.
[14]Paz S,Jaudenes J R,Guti2Rrez A J,et al.Determination of fluoride in organic and non-organic wines[J].Biological Trace Element Research,2017,178(1):153-159.
[15]Shen J,Gagliardi S,Mccoustra M R,et al.Effect of humic substances aggregation on the determination of fluoride in water using an ion selective electrode[J].Chemosphere,2016,159(1):66-71.
[16]Kaushik Sanyal,Misra N L.Direct determination of fluorine in highpurity water samples using vacuum sample chamber total reflection X-ray fluorescence spectrometry[J].Journal of Analytical Atomic Spectrometry,2018,3(5):876-882.
[17]Liu S H,Yuan Q D,Chen P,et al.Determination of the content of fluorine and chlorine in inorganic insulation materials by ion chromatography[J].Key Engineering Materials,2018,768(4):41-45.
[18]Zhang C,Koepke J,Wang L,et al.A practical method for accurate measurement of trace level fluorine in Mg-and Fe-bearing minerals and glasses using electron probe microanalysis[J].Geostandards&Geoanalytical Research,2016,40(3):351-363.
[19]严鹏飞,吴亮,姚静,等.原位水解-硝酸镧电位滴定法测定钛合金化铣腐蚀溶液中总氟化物[J].应用化学,2018,35(6):729-734.
[20]谭和平,周黎黎.茶叶中氟化物的测试方法研究[J].中国测试,2014,40(5):58-60.
[21]Hakan ?ift?i,Yasemin Oztekin,Uˇgur Tamere,et al.Development of poly(3-aminophenylboronic acid)modified graphite rod electrode suitable for fluoride determination[J].Talanta,2014,18(3):202-207.
[22]Najari S,Bagheri H,Monsef-Khoshhesab Z,et al.Amperometric hydrazine sensor using a glassy carbon electrode modified with gold nanoparticle-decorated multiwalled carbon nanotubes[J].Ionics,2018,(1):1-11.
[23]齐国鹏,姜峰.银纳米粒子复合材料在电化学传感器中的应用研究进展[J].化工新型材料,2017,45(9):12-16.
[24]董绍俊,车广礼,谢远武.化学修饰电极[M].北京:科学出版社,2003:18-19.
[25]陈巧玲,胡叶碧,李忠海.砖茶中氟的释放条件与饮用摄入量的研究[J].现代食品科技,2010,26(9):934-936.
[26]黄压压.泾渭茯砖茶水溶性氟浸出量研究[J].食品科技,2013,38(2):83-85.
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