Gurijala Ramakrishna Naidu
Sri Venkateswara University
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Publication
Featured researches published by Gurijala Ramakrishna Naidu.
Talanta | 2004
P. Metilda; K. Sanghamitra; J. Mary Gladis; Gurijala Ramakrishna Naidu; T. Prasada Rao
Amberlite XAD-4 resin has been functionalized with succinic acid by coupling it with dibromosuccinic acid after acetylation. The resulting resin has been characterized by FT-IR, elemental analysis and TGA and has been used for preconcentrative separation of uranium(VI) from host of other inorganic species prior to its determination by spectrophotometry. The optimum pH value for quantitative sorption of uranium(VI) in both batch and column modes is 4.5-8.0 and desorption can be achieved by using 5.0ml of 1.0moll(-1) HCl. The sorption capacity of functionalized resin is 12.3mgg(-1). Calibration graphs were rectilinear over the uranium(VI) concentrations in the range 5-200mugl(-1). Five replicate determinations of 50mug of uranium(VI) present in 1000ml of solution gave a mean absorbance of 0.10 with a relative standard deviation of 2.56%. The detection limit corresponding to three times the standard deviation of the blank was found to be 2mugl(-1). Various cationic and anionic species at 200-fold amounts do not interfere during the preconcentration of 5.0mug of uranium(VI) present in 1000ml (batch) or 100ml (column) of sample solution. Further, adsorption kinetic and isotherm studies were also carried out by a batch method to understand the nature of sorption of uranium(VI) with the succinic acid functionalized resin. The accuracy of the developed solid phase extractive preconcentration method in conjunction with Arsenazo III procedure was tested by analyzing marine sediment (MESS-3) and soil (IAEA soil-7) reference material. Further, the above procedure has been successfully employed for the analysis of soil and sediment samples.
Talanta | 2004
P Gopi Krishna; J. Mary Gladis; U Rambabu; T. Prasada Rao; Gurijala Ramakrishna Naidu
A rapid, sensitive and selective method is described for the determination of chromium(VI) in presence of 100-fold amounts of chromium(III) by flame atomic absorption spectrometry (FAAS) in conjunction with coprecipitative preconcentration of its ethyl xanthate complex onto naphthalene. The solid mixture consisting of the chromium(VI) complex together with naphthalene is dissolved in 8.0ml of dimethyl formamide (DMF) and chromium(VI) content was established by FAAS. Calibration graphs were rectilinear over the chromium(VI) concentration in the range 0-200mugl(-1). Five replicate determinations of 20mug of chromium(VI) present in 1.0l of sample solution gave a relative standard deviation of 3.1%. The detection limit corresponding to three times the standard deviation of the blank was found to be 0.5mugl(-1). The developed procedure has been successfully utilized for the estimation of chromium(VI), chromium(total) (after oxidation with bromate) and chromium(III) (by subtracting chromium(VI) content from chromium(total) value contents of several tannery industries.
Talanta | 2008
D. James; J. Mary Gladis; A.K. Pandey; Gurijala Ramakrishna Naidu; T. Prasada Rao
A two-dimensional biomimetic optrode for the detection and quantification of uranium in natural waters was fabricated. The sensing element was designed by the inclusion of uranyl ion imprinted polymer particles into polymethyl methacrylate followed by casting a thin film on a glass slide without any plasticizer. The ion imprinted polymer material was prepared via covalent immobilization of the newly synthesised ligand 4-vinyl phenylazo-2-naphthol by thermal polymerization. Operational parameters such as pH, response time and the amount of sensing material were optimized. The response characteristics of the imprinted and the corresponding non-imprinted polymer inclusion optrodes of uranium were compared under optimum conditions. The imprinted polymer inclusion optrode responds linearly to uranium in the concentration range 0-1.0 microg mL(-1) with a detection limit of 0.18 microg mL(-1), which is much better than the solution studies using 4-vinyl phenylazo-2-naphthol (1.5 microg mL(-1)). Triplicate determinations of 100 microg of uranium(VI) present in 250 mL of solution gave a mean absorbance of 0.018 with a relative standard deviation of 8.33%. The superior sensitivity of imprinted polymer inclusion optrode is exemplified by lower detection limits and broader dynamic range over non-imprinted polymer inclusion optrode. The developed imprinted polymer inclusion optrode was found to give stable and precise response for 3 months and can be used without any loss in sensitivity. The applicability for analysing ground, lake and tap-water samples collected in the vicinity of uranium deposits was successfully demonstrated.
Sensors and Actuators B-chemical | 2007
K. Prasad; Krishnapillai Padmajakumari Prathish; J. Mary Gladis; Gurijala Ramakrishna Naidu; T. Prasada Rao
Journal of Molecular Recognition | 2005
Paramesamangalam Gopi Krishna; Joseph Mary Gladis; Talasila Prasada Rao; Gurijala Ramakrishna Naidu
Journal of Radioanalytical and Nuclear Chemistry | 2005
P. Gopi Krishna; Joseph Mary Gladis; K. S. Rao; T. Prasada Rao; Gurijala Ramakrishna Naidu
American Journal of Analytical Chemistry | 2011
Varada Vishnuvardhan; Yakkala Kalyan; Krishnapillai Padmajakumari Prathish; Battala Gangadhar; Talasila Prasada Rao; Gurijala Ramakrishna Naidu
Electroanalysis | 2007
Karamala Prasad; Krishnapillai Padmajakumari Prathish; Joseph Mary Gladis; Gurijala Ramakrishna Naidu; Talasila Prasada Rao
Journal of Sensor Technology | 2012
Yakkala Kalyan; Battala Gangadhar; Korivi Sujan Kumar; Gurijala Ramakrishna Naidu
Chemia Analityczna | 2004
P. Gopi Krishna; K. S. Rao; V. M. Biju; T. Prasada Rao; Gurijala Ramakrishna Naidu
Collaboration
Dive into the Gurijala Ramakrishna Naidu's collaboration.
Krishnapillai Padmajakumari Prathish
Council of Scientific and Industrial Research
View shared research outputsNational Institute for Interdisciplinary Science and Technology
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