title: A fluorometric paper-based sensor array for the discrimination of heavy-metal ions.
abstract: A fluorometric paper-based sensor array has been developed for the sensitive and convenient determination of seven heavy-metal ions at their wastewater discharge standard concentrations. Combining with nine cross-reactive BODIPY fluorescent indicators and array technologies-based pattern-recognition, we have obtained the discrimination capability of seven different heavy-metal ions at their wastewater discharge standard concentrations. After the immobilization of indicators and the enrichment of analytes, identification of the heavy-metal ions was readily acquired using a standard chemometric approach. Clear differentiation among heavy-metal ions as a function of concentration was also achieved, even down to 10(-7)M. A semi-quantitative estimation of the heavy-metal ion concentration was obtained by comparing color changes with a set of known concentrations. The sensor array was tentatively investigated in spiked tap water and sea water, and showed possible feasibility for real sample testing.
authors.affiliation: Laboratory of Instrumentation and Analytical Chemistry, Key Lab of Separation Science for Analytical Chemistry of CAS, Dalian Institute of Chemical Physics, CAS, Dalian, Liaoning 116023, PR China. fengl@dicp.ac.cn
authors.forename: Liang
authors.initials: L
authors.lastname: Feng
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Li-Ya
authors.initials: LY
authors.lastname: Niu
authors.forename: Ying-Shi
authors.initials: YS
authors.lastname: Guan
authors.forename: Chun-Feng
authors.initials: CF
authors.lastname: Duan
authors.forename: Ya-Feng
authors.initials: YF
authors.lastname: Guan
authors.forename: Chen-Ho
authors.initials: CH
authors.lastname: Tung
authors.forename: Qing-Zheng
authors.initials: QZ
authors.lastname: Yang
mesh_terms: D001896:Boron Compounds; D005456:Fluorescent Dyes; D005470:Fluorometry / Q000379:methods*; D019216:Metals, Heavy / Q000032:analysis*; D010209:Paper; D062065:Wastewater / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D001896:Boron Compounds; D005456:Fluorescent Dyes; D019216:Metals, Heavy; D062065:Wastewater; D014874:Water Pollutants, Chemical; C095489:4,4-difluoro-4-bora-3a,4a-diaza-s-indacene