title: Optical test strip for trace Hg(II) based on doped sol-gel film.
abstract: Optical test strip based on the use of Br-PADAP as a sensitive reagent immobilised into sol-gel thin film for detection of Hg(II) in aqueous solution had been thoroughly carried out. It has a square-sensing zone (1.0 cm x 1.0 cm) containing the sensitive reagent necessary to produce response to trace level of mercury. This method offer sensitivity and simplicity in detecting Hg(II) as no prior treatment or extraction is required. A linear response was attained in the Hg(II) concentration in the range of 0.5-2.5 ppm with calculated limit of detection of 6.63 ppb. This method also showed a reproducible result with relative standard deviation (R.S.D.) of 2.15% and response time of approximately 5 min. Interference studies showed that Al(III), Co(II) and Ni(II) significantly interfered during the determination. The developed sensor has been validated against Atomic Absorption Spectroscopy method and proven comparable.
authors.affiliation: Chemistry Department, Faculty of Science and Environmental Studies, Universiti Putra Malaysia, 43400 Serdang, Selangor D.E., Malaysia. azah@science.upm.edu.my
authors.forename: Nor Azah
authors.initials: NA
authors.lastname: Yusof
authors.forename: Wan Abdul Rahman Wan Abdul
authors.initials: WA
authors.lastname: Kadir
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D005782:Gels; D006863:Hydrogen-Ion Concentration; D008628:Mercury / Q000032:analysis*; D055095:Optics and Photonics / Q000295:instrumentation*; D011934:Reagent Strips / Q000737:chemistry*; D013053:Spectrophotometry
chemical_list: D001391:Azo Compounds; D005782:Gels; D011934:Reagent Strips; C037882:2-(5-bromo-2-pyridylazo)-5-diethylaminophenol; D008628:Mercury