新型光化学敏感膜用于六价铬的测定
Use of New Photochemical-Sensing Membrane in Determination of Hexavalent Chromium
摘 要
研制了基于新型分子导线化合物2-(2-(4-(2-(4-(2-(2,5-二庚基-4-(2-(噻吩-2-基)乙炔基)苯基)乙炔基)苯基)乙炔基)-2,5-二庚苯基)乙炔基)噻吩(简称FDB)测定铬(Ⅵ)的光化学敏感膜.研究表明:铬(Ⅵ)对固定于聚氯乙烯膜中的FDB有可逆荧光猝灭作用.敏感膜最佳组成为:55.0 mg聚氯乙烯、105.0 mg邻苯二甲酸二异辛酯(DIOP)和5.0 mg四苯硼钠(NaTPB).选用最大激发波长为371 nm,发射波长为407 nm,在0.60 mol·L-1硫酸溶液中,测定铬(Ⅵ)的线性范围为3.78×10-6~1.26×10-3mol·L-1,检出限(3S/N)为5.16×10-7mol·L-1,响应时间小于1 min.敏感膜具有良好的重现性、可逆性和选择性,其他常见金属离子不干扰测定.应用于环境水中铬(Ⅵ)的测定,测定值与国标GB/T 7468-1987的测定结果相符,回收率为96.0%~106.3%.
分子导线化合物
六价铬
Photochemical sensing membrane
Molecular conductor wire compound
Chromium(Ⅵ)
Abstract
A new type of photochemical-sensing membrane for the determination of Cr(Ⅵ),based on the reversible fluorescence-quenching of the conductor wire compound,2-(2-(4-(2-(4-(2-(2,5-diheptyl-4-(2-thiophenyl-2-)-ethinyl)-phenyl)-ethinyl)-phenyl)-ethinyl)-2,5-diheptophenyl)-ethinyl) thiophene (FDB in short) was prepared by mixing an appropriate amount of FDB dissolved in 2 mL of tetrahydrofuran with 55.0 mg of polyvinyl chloride (PVC),105.0 mg of diiso-octyl-o-phthalate (DIOP) and 5.0 mg of sodium tetraphenylboron,and making into membrane.Fluorescence detection was made in a 0.60 mol·L-1 H2SO4 solution at the wavelengths of (λex) 371 nm and (λem) 407 nm.Linearity range for determination of Cr(Ⅵ) was kept between 3.78×10-6-1.26×10-3mol·L-1.Detection limit (3S/N) of 5.16×10-7mol·L-1 was found for the method.Time of response was less than 1 min.No interference by those common metal ions was observed.The proposed method was applied to the analysis of samples of lake and river water,giving results in consistency with the results found by the method of GB/T 7468-1987.Values of recovery found were in the range of 96.0%-106.3%.
中图分类号 O657.3
所属栏目 试验与研究
基金项目 湖南城市学院科技计划项目(08C004);国家高技术研究发展计划(863计划,2007AA06Z402);上海市科委创新行动计划项目(08520510400)
收稿日期 2009/1/12
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备注尹志芳(1978-),女,湖南省邵东人,讲师,硕士,主要从事光化学传感器及膜分离研究.
引用该论文: YIN Zhi-fang,HUANG Shan-sheng,ZHONG Tong-sheng,LONG Li-ping,DONG Rong-pin,ZHOU Zi-yin. Use of New Photochemical-Sensing Membrane in Determination of Hexavalent Chromium[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2009, 45(11): 1257～1260
尹志芳,黄杉生,钟桐生,龙立平,董蓉萍,周子茵. 新型光化学敏感膜用于六价铬的测定[J]. 理化检验－化学分册, 2009, 45(11): 1257～1260
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参考文献
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【2】HASSAN S S M,El-SHAHAWI M S,OTHMAN A M,et al.A Potentiometric rhodamine-B based membrane sensor for the selective determination of chromium ions in wastewater[J].Analytical Science,2005,21(6):673-678．
【3】ALFAYA A A S,GUSHIKEM Y.The preparation and application of silica-zirconia xerogel as potentiometric sensor for chromium(Ⅵ)[J].Journal of Colloid and Interface Science,1999,209(2):428-434．
【4】陈焕文,徐抒平,于爱民,等.二苯碳酰二肼柠檬酸盐光度法快速测定水中铬(Ⅵ)[J].高等学校化学学报,2002,23(10):1873-1876．
【5】KUMAR P S,LEE S T,VALLABHAN C P G,et al.Desing and development of an LED based fiber optic evanescent wave sensor for simultaneous detection of chromium and nitrite traces in water[J].Optics Communications,2002,214(1/6):25-30．
【6】SCINDIA Y M,PANDEY A K,REDDY A V R,et al.Chemically selective membrane optode for Cr(Ⅵ) determination in aqueous samples[J].Analytical Chimica Acta,2004,515(2):311-321．
【7】CHWASTOWSKA J,SKWARA W,STERLINSKA E,et al.Speciation of chromium in mineral waters and salinas by solid-phase extraction and graphite furnace atomic absorption spectrometry[J].Talanta,2005,66(5):1345-1349．
【8】GIL R A,CERUTTI S,GSQUEZ J A,et al.Preconcentration and speciation of chromium in drinking water samples by coupling of on-line sorption on activated carbon to ETAAS determination[J].Talanta,2006,68(4):1065-1070．
【9】刘峥,王学燕.催化动力学光度法测定痕量铬[J].分析化学,1996,24(2):164-166．
【10】赵桦萍.催化动力学光度法测定水中痕量铬——应用β-环糊精作增敏剂[J].理化检验-化学分册,2007,43(10):488-489．
【11】王玉宝,陈玉静,唐清华,等.离子交换纤维分离富集催化光度法测定痕量铬(Ⅵ)[J].理化检验-化学分册,2007,43(12):1085-1087．
【12】PRESSMAN M A,ALDSTADT H J.A comparative study of diffusion samplers for the determination of hexavalent chromium by sequential injection spectrophotometry [J].Microchemical Journal,2003,74(1):47-57．
【13】张海松,杨秀岑,伍莉萍.流动注射化学发光同时测定废水中的三价铬和六价铬[J].分析化学,1995,23(10):1148-1150．
【14】赵萍,顾爱平.流动注射光度法测定铬(Ⅵ)[J].理化检验-化学分册,2007,43(8):696-670．
【15】徐瑞银.萃取光度法测定电镀废水中的微量Cr(Ⅵ)[J].光谱学与光谱分析,2003,23(6):1221-1223．
【16】阎俊英,王庆林,刘德龙.萃取光度法测定高纯氧化钐中的铬[J].光谱实验室,2001,18(4):491-494．
【17】龙立平,王柯敏,杨荣华,等.荧光熄灭的苦味酸光化学传感器[J].分析化学,2003,31(4):414-419．
【18】曾恚恚,王柯敏,秦臻,等.基于荧光熄灭的二氧化硫选择性光化学敏感膜的研究[J].高等学校化学学报,1993,14(2):180-184．
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