Browsing by Author "Suah F.B.M."
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Publication Effect of addition of non-ionic surfactant to the A2l(III)-morin complex in spectrophotometry determination of aqueous aluminum(III) [Kesan penambahan surfaktan tak-ionik kepada kompleks Al(III)-morin dalam penentuan aluminium (III) akues secara spektrofotometri](Penerbit Universiti Kebangsaan Malaysia, 2016-12) ;Suah F.B.M. ;Ahmad M. ;Heng L.Y. ;Faculty of Science and Technology ;Universiti Sains Malaysia (USM) ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)The effect of surfactants on the Al(III)-morin complex have been studied. It was found that non-ionic surfactant noticeably enhances the absorbance of the Al(III)-morin complex. Determination of submicrogram quantities of Al(III) ion at pH4.00 was made possible by the addition of triton X-100. Maximum absorption was obtained at wavelength of 425 nm, with the calculated molar absorptivity, ϵ, of 9.31 × 103 l.mol1.cm1. A linear calibration curve of 0.03 to 2.0 μg mL1 with the detection limit of 0.015 μg mL1 was attained for determination of Al(III) ion. The calculated relative standard deviation (r.s.d) was 2.2% for Al(III) ion quantified at 1.0 μg mL1. The influence of foreign ions towards the Al(III)-morin complex responses have been carried out too, with Cu(II), Zn(II) and Pb(III) were found to be the main interferences. - Some of the metrics are blocked by yourconsent settings
Publication Effect of non-ionic surfactants to the Al(III)-morin complex and its application in determination of Al(III) ions: A preliminary study(Malaysian Society of Analytical Sciences, 2017-05-11) ;Suah F.B.M. ;Ahmad M. ;Mehamod F.S. ;Faculty of Science and Technology ;Universiti Sains Malaysia (USM) ;Universiti Sains Islam Malaysia (USIM)Universiti Malaysia Terengganu (UMT)A simple and sensitive spectrofluorimetric method for the determination of Al(III) based on the formation of Al-Morin-Triton X-100 ternary complex is described. The effect of other non-ionic surfactants, such as Tween 80, Tween 20 and octylglucoside (OG) on fluorescence analysis were also studied. The addition of Triton X-100 makes feasible the fluorimetric determination of submicrogram quantities of Al(III). The complex was excited at 410 nm and the fluorescence signal was measured at 495 nm. Maximum fluorescence signal was produced at pH 4.0 (acetic acid-acetate buffer), with 0.6% Triton X-100 and 1.35 � 10-3 mol L-1 Morin. The calibration graph is linear up to 7 mg L-1 and the detection limit is 0.022 mg L?1. The relative standard deviation is 1.81% for Al(III) at 5 mg L-1. It was found that Zn(II) and F- produced highest interference. � 2017, Malaysian Society of Analytical Sciences. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Publication Enhancing the sensitivity of Al(III) optical sensor by utilizing polymer inclusion beads(Penerbit Universiti Kebangsaan Malaysia, 2016) ;Suah F.B.M. ;Ahmad M. ;Heng L.Y. ;Faculty of Science and Technology ;Universiti Sains Malaysia (USM) ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)An optical Al(III) sensor base on reflectance principle has been developed using polymer inclusion membranes (PIMs) beads. The immobilized PIMs beads are consists of poly(vinyl chloride) (PVC), Aliquat 336, dioctyl phthalate (DOP) and eriochrome cyanine R (ECR) reagent. The sensor which was based on immobilized PIMs beads produced higher response compared to sensor based on non-immobilized PIMs beads. The response time of the sensor was 3 min with an optimum pH value of 6.0. This optical Al(III) sensor gave a linear response at the range of 5.56�10-5- 3.52�10-4molL1, with the limit of detection value 3.41�10-5molL1. Validation of Al(III) value in spiked natural water samples by using Al(III) sensor developed in this study showed no significance differences compared with results obtained by using conventional atomic absorption spectrophotometer. - Some of the metrics are blocked by yourconsent settings
Publication Highly sensitive fluorescence optode based on polymer inclusion membranes for determination of Al(III) ions(Springer New York LLC, 2014) ;Suah F.B.M. ;Ahmad M. ;Heng L.Y. ;Faculty of Science and Technology ;Universiti Sains Malaysia (USM) ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)This paper reports the use of a polymer inclusion membranes (PIMs) for direct determination of Al(III) ions in natural water by using a fluorescence based optode. The best composition of the PIMs consisted of 60 wt.% (m/m) poly (vinyl chloride) (PVC) as the base polymer, 20 wt.% (m/m) triton X-100 as an extractant, 20 wt.% (m/m) dioctyl phthalate (DOP) as plasticizer and morin as the reagent, was used in this study. The inclusion of triton X-100 was used for enhancing the sorption of Al(III) ions from liquid phase into the membrane phase, thus increasing the optode fluorescence intensity. The optimized optode was characterized by a linear calibration curve in the range from 7.41 � 10-7 to 1.00 � 10-4 molL-1 of Al(III), with a detection limit of 5.19 � 10-7 molL-1. The response of the optode was 4 min and reproducible results were obtained for eight different membranes demonstrated good membrane stability. The optode was applied to the determination of Al(III) in natural water samples. The result obtained is comparable to atomic absorption spectrometry method. � 2014 Springer Science+Business Media New York. - Some of the metrics are blocked by yourconsent settings
Publication Highly sensitive fluorescence optode for aluminium(III) based on non-plasticized polymer inclusion membrane(Elsevier, 2014) ;Suah F.B.M. ;Ahmad M. ;Heng L.Y. ;Faculty of Science and Technology ;Universiti Sains Malaysia (USM) ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)A highly sensitive and simple reagent immobilization procedure for a non-plasticized fluorescence optode based on polymer inclusion membranes (PIM) has been developed. The preparation procedure is based on physical immobilization procedure, namely encapsulation technique which produces an optical sensing membrane. The sensitive PIM contains poly (vinyl chloride) (PVC) as the base polymer, Aliquat 336 as an extractant and sodium morin-5-sulphonate (NaMSA) as the reagent. The use of PIM has increased the response of the PIM based optode about five-fold enhancement compared to the non-PIM optode. The optimized optode was characterized by a linear calibration curve in the range from 5.19 � 10-7 to 6.00 � 10-5 mol L -1 of aluminium(III) (Al(III)), with a detection limit of 4.07 � 10-7 mol L-1. The response of the optode was three minutes and it was also found to be reproducible. The optode has been successfully tested for the determination of Al(III) in natural water samples and result obtained is comparable to atomic absorption spectrometry method. � 2014 Elsevier B.V. - Some of the metrics are blocked by yourconsent settings
Publication A novel polymer inclusion membranes based optode for sensitive determination of Al3+ ions(Elsevier, 2015) ;Suah F.B.M. ;Ahmad M. ;Heng L.Y. ;Faculty of Science and Technology ;Universiti Sains Malaysia (USM) ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)A novel approach for the determination of Al3+ from aqueous samples was developed using an optode membrane produced by physical inclusion of Al3+ selective reagent, which is morin into a plasticized poly(vinyl chloride). The inclusion of Triton X-100 was found to be valuable and useful for enhancing the sorption of Al3+ ions from liquid phase into the membrane phase, thus increasing the intensity of optode's absorption. The optode showed a linear increase in the absorbance at λmax = 425 nm over the concentration range of 1.85 × 10-6-1.1 × 10-4 mol L-1 (0.05-3 μg mL-1) of Al3+ ions in aqueous solution after 5 min. The limit of detection was determined to be 1.04 × 10-6 mol L-1 (0.028 μg mL-1). The optode developed in the present work was easily prepared and found to be stable, has good mechanical strength, sensitive and reusable. In addition, the optode was tested for Al3+ determination in lake water, river water and pharmaceutical samples, which the result was satisfactory. - Some of the metrics are blocked by yourconsent settings
Publication Preparation and characterization of polymer inclusion membrane based optode for determination of Al3+ ion(Elsevier B.V., 2017) ;Suah F.B.M. ;Ahmad M. ;Faculty of Science and Technology ;Universiti Sains Malaysia (USM)Universiti Sains Islam Malaysia (USIM)The use of a polymer inclusion membrane (PIM) as a sensing material is a new approach to overcome the selectivity and stability drawbacks of the optical chemical sensor (optode). In this study, non-plasticized PIM containing poly(vinyl chloride) as a support base, sodium morin-5-sulfonate (NaMSA) as a reagent and Aliquat 336 as a fixed carrier (ionophore) was prepared and its performance was tested for application in an optode to determine Al3+ ions. The results showed that PIM properties are greatly influenced by the membrane composition. The studies revealed that the optode response was dependent on film thickness, the presence of plasticizer, stirring effect, concentration of NaMSA, concentration of Aliquat 336 and pH of the aqueous solution used. The dynamic range of Al3+ ions concentration determined using this optode was linear from 5.19�נ10?7 to 6.00�נ10?5�mol�L?1 and the calculated limit of detection (L.O.D.) was found to be 4.07�נ10?7�mol�L?1. The maximum emission wavelength (?em) for the PIM based optode was 512�nm. Scanning electron microscopy analysis of the PIM revealed that a dense texture was formed. Fourier transform infra-red and thermal gravimetry analysis characterizations proved that all of the constituents of the PIM remain within the membrane. The PIM developed in this work was found to be stable, has good mechanical strength, and is sensitive and reusable. Lastly, the PIM was successfully applied as an optical sensor for determination of Al3+ ions in an aqueous solution. � 2016 Elsevier B.V.