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- W97007075 abstract "Chemical sensor based on the use of uv-visible spectrophotometer and opticalfibre reflectance spectrometer (OFRS) for the determination of Fe(II1) and V(V)ions have been developed in this study. Fatty hydroxamic acid (FHA) was usedas a reagent for both metals and shows good properties after characterizationusing manual batch method. FHA immobilized on poly(viny1 chloride) (PVC)and poly(methy1 methacrylate) (PMMA) as sensing membranes weresuccessfully applied for determination of V(V). However, both immobilizationprocesses were not showing any measurable signal in determination of Fe(II1).PMMA membrane immobilized FHA was characterized using uv-visiblespectrophotometer. The sensing membrane changed fiom colorless to darkpurple in the presence of V(V) with response time of five minutes. The relativestandard deviation (RSD) of the reproducibility were found to be 9.29% and7.09% for V(V) at concentration of 50 ppm and 200 ppm, respectively.Interference fiom foreign ions were studied at 1:l mole ratio of V(V) tointerfering ion. The interference faced by Fe(II1) was the greatest when it wascompared with other cations, whereas phosphate ion gave the highest anioninterferences. The limit of detection of the PMMA membrane immobilizedFHA was calculated to be 8.4 ppm.PVC membrane immobilized FHA was characterized using optical fibrereflectance spectrometer. The sensing membrane changed its color fromcolorless to purple in the presence of V(V) and with response time of fiveminutes. The RSD of the reproducibility were found to be 3.91% and 3.85% forV(V) at concentration of 1 ppm and 20 ppm, respectively. Interference fromforeign ions were studied at 1 : 1 mole ratio of V(V) to interfering ion. Fe(II1)was found to interfere most compared to other cations, whereas citrate gave thehighest anion interferences. The limit of detection of the PVC membraneimmobilized FHA was calculated to be 0.1 ppm.The results obtained from both instruments which have been developed in thisstudy were compared with the well established method of inductively coupledplasma-atomic emission spectroscopy (ICP-AES). The comparison results showan excellent agreement between the developed method and ICP-AES method.This indicates that the results obtained fiom both methods are comparable." @default.
- W97007075 created "2016-06-24" @default.
- W97007075 creator A5000827576 @default.
- W97007075 date "2005-04-01" @default.
- W97007075 modified "2023-09-24" @default.
- W97007075 title "Development of Chemical Sensor Based on Fatty Hydroxamic Acid for The Determination of Vanadium (V) and Iron (Iii) Ions" @default.
- W97007075 hasPublicationYear "2005" @default.
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