Optosensing of hydrochloric acid based on the fluorescence quenching of a flavone copolymer |
| |
Authors: | Wanhui Liu Jianghong Tang Ying Wang Guoli Shen and R Yu |
| |
Institution: | (1) College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P.R. China, CN;(2) Analytical Center, Yantai University, Yantai, 264005, P.R. China, CN;(3) College of Chemistry and Chemical Engineering, Southwest Normal University, Chongqing, 400715, P.R. China, CN |
| |
Abstract: | An optical fiber sensor for the continuous determination of hydrochloric acid is presented. It is based on the fluorescence
quenching of a flavone containing copolymer membrane by hydrochloric acid. The quenching efficiency is greatly enhanced in
the presence of Fe(III). This enhancement is attributed to the primary inner filter effect, as well as the formation of a
complex between the 4′-N,N-dimethylaminoflavone group in the copolymer and the Fe(III) species extracted from hydrochloric
acid solution. The optical response is linear and reversible for 0.10–6.00 mol L–1 HCl with a response time of the order of a second. The standard deviations for repeated alternative measurements of 0.20
and 2.00 mol L–1 hydrochloric acid are 0.32% and 0.46% (n = 10), respectively, indicating a good reproducibility. Because of the covalently bonding of the dye to polymer, the sensor
exhibits also a good stability. Selectivity has also been evaluated for some potential interferents. The sensor in conjunction
with a flow-injection system can be used for on-line determination of hydrochloric acid.
Received: 15 January 1998 / Revised: 14 April 1998 / Accepted: 18 April 1998 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|