Optical test strip for trace Hg(II) based on doped sol-gel film.
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.
Yusof
Nor Azah
NA
Chemistry Department, Faculty of Science and Environmental Studies, Universiti Putra Malaysia, 43400 Serdang, Selangor D.E., Malaysia. azah@science.upm.edu.my
Kadir
Wan Abdul Rahman Wan Abdul
WA
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
D001391:Azo Compounds; D005782:Gels; D011934:Reagent Strips; C037882:2-(5-bromo-2-pyridylazo)-5-diethylaminophenol; D008628:Mercury