A novel sensing membrane for the determination of ferric ions in aqueous solutions. Issue 7 (4th March 2015)

• Record Type: Journal Article
• Authors: Fu, Wenjuan; Guo, Xiangfeng; Jia, Lihua; Ding, Ying
• Is Part Of: Analytical methods. Volume 7:Issue 7(2015)
• Page Start: 3089
• Page End: 3095
• Publication Date: 2015-03-04
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c5ay00133a
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : A new sensing membrane is proposed for the determination of Fe 3+ over other common metal ions in an aqueous solution based on the quenching of the fluorescence intensity of the membrane by Fe 3+ . The fluorescence intensity of the membrane showed distinct changes towards Fe 3+ with fast response, satisfactory stability and excellent sensitivity. Abstract : A new fluorescent sensing membrane, in which a naphthalimide derivative containing two long hydrophobic hydrocarbon chains, amphiphilic molecule castor oil polyoxyethylene ether and PVC were respectively used as the fluorescent indicator, plasticizer and matrix, for specific recognition of Fe 3+ was prepared based on the physical entrapment method. The results show that the fluorescence of the sensing membrane is selectively quenched by Fe 3+ ions over other common metal ions in aqueous solutions. A good linear response range of the sensing membrane is achieved from 5.0 × 10 −5 to 1.5 × 10 −3 M ( R 2 = 0.9906), with a detection limit of 4.0 × 10 −7 M. The sensing membrane shows good reversibility, a fast response of less than 20 s and satisfactory stability with a relative standard deviation of ±1.5%. Moreover, it was successfully applied in the detection of Fe 3+ in tap water with recovery in the range of 97.6–101.2%.