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dc.contributor.authorOdeh, Imad
dc.contributor.authorShakhsher, Ziad
dc.contributor.authorJaber, Suha
dc.contributor.authorKhateeb, Mahmood
dc.contributor.authorAl-Rimawi, Fuad
dc.date.accessioned2018-09-08T13:50:03Z
dc.date.available2018-09-08T13:50:03Z
dc.date.issued2012-04-04
dc.identifier.citationOdeh, Z. Shakhsher, S. Jaber, M. Khateeb and F. Al-Rimawi, "An Optical Sensor Based on Polyvinyl Benzyl Malonate Cross-Linked with Divinyl Benzene Dispersed in a Hydrogel Membrane for Detection of Some Heavy Metals," American Journal of Analytical Chemistry, Vol. 3 No. 4, 2012, pp. 283-287. doi: 10.4236/ajac.2012.34038.en_US
dc.identifier.issn2156-8278
dc.identifier.urihttps://dspace.alquds.edu/handle/20.500.12213/862
dc.description.abstractIn previous work we have developed a dicarboxylate functionalized polymer that demonstrated chemical sensing. It showed good response to pH changes as well as to varying concentrations of copper and calcium ions. Our recent investi- gations showed interesting results upon testing the functionalized sensing polymer on heavy metals. This sensor is composed of microspheres of polyvinyl benzyl malonate lightly-cross-linked with divinyl benzene dispersed in a hy- drogel membrane. The response of the optical sensor is based on the interaction between the metal cations with the de-protonated functional group. The polymer, thus, undergoes shrinking as a result of neutralization of adjacent negative charges on the back-bone of the polymer. This causes significant changes in the optical properties of the sensing ele- ment. The optical changes were measured as absorbance vs. wavelength as the sensing membrane is exposed to solu- tions of varying concentrations of heavy metal ions. The sensor showed significant increase in absorbance up to a con- centration of 5 × 10–3 M to the following metal ions: Ni2+, Zn2+, and Cd2+. Furthermore, the studied capacity of the deri- vatized microspheres showed close values to Ni2+, Zn2+, Cd2+ (1.20, 1.09, 1.08 mmol/g respectively). These kinds of properly functionalized polymers appear to be suitable, versatile sensing elements for the detection of low concentra- tions of heavy metal ions. In addition, all of the tested heavy metals showed a similar value of the equilibrium formation constant, (log Kf1 is 2.63). In contrast, the sensor showed no significant response to varying concentrations of K+ and Mg2+ metal ions.en_US
dc.description.sponsorshipThe authors are indebted to the faculty of Science and Technology at Alquds University for financial support, and to George Mwangi, Necati Kaval and Huqun Liu at the University of New Hampshire for providing poly (vinylbenzyl chloride) microspheres.en_US
dc.language.isoen_USen_US
dc.publisherScientific Researchen_US
dc.subjectShrinking Microsphere Polymeren_US
dc.subjectPolyvinylbenzylmalonateen_US
dc.subjectOptical Chemical Sensorsen_US
dc.subjectHeavy Metal Sensingen_US
dc.subjectEquilibrium Formation Constanten_US
dc.titleAn Optical Sensor Based on Polyvinyl Benzyl Malonate Cross-Linked with Divinyl Benzene Dispersed in a Hydrogel Membrane for Detection of Some Heavy Metalsen_US
dc.typeArticleen_US


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