Journal of Applied and Natural Science, Jun 20, 2023
Soil contamination by heavy metals is a concern around the world. Heavy metals in soil gain atten... more Soil contamination by heavy metals is a concern around the world. Heavy metals in soil gain attention because of their toxicological importance in the environment, agriculture and human health (Alloway, 1990). Metals like Mn, Fe, Cu, Ni, Zn and Co are required for the normal metabolic processes of living organisms, but when these are present beyond the permissible limit, it becomes harmful. Changes in physiological and biochemical processes due to heavy metal pollution in the soil cause a reduction in growth, which has been recorded and expressed in various studies. Heavy metal contamination has dire ecological consequences and it affects agricultural yield, soil fertility and soil microorganisms. Chromium (Cr) occurs in earth's crust in a trivalent state (Cr 3+), but hexavalent (Cr 6+
Zenodo (CERN European Organization for Nuclear Research), Nov 30, 2013
A simple and rapid inductively coupled plasma optical emission spectrometric (ICP-OES) determinat... more A simple and rapid inductively coupled plasma optical emission spectrometric (ICP-OES) determination of trace level rare earth elements (REEs) and Y in high purity zirconium matrix and zircon samples is described. The method involves solvent extraction separation of zirconium from 3 M HCI solution using di-(2-ethylhexyl)phosphoric acid (D 2 EHPA) in toluene, which selectively separates zirconium leaving behind the trace REEs and Y in aqueous media, for quantification by ICP-OES. The quantitative extraction of Tm, Yb and Lu are achieved by the addition of octanol. The method has been applied to synthetic zirconium samples doped with REEs and Y and the recoveries were quantitative. The method was extended to the determination of REEs and Y zircon samples. Accuracy of the method was checked by applying the proposed method to three zircon certified reference materials and the percentage error obtained was 1-6%. The values obtained agreed well with the reported values. The percentage RSD of all estimated elements varied between 1-5% at different concentration levels.
Zirconia - New Advances, Structure, Fabrication and Applications [Working Title]
Main resource of zirconia is the mineral zircon which occurs in beach sand and placer deposits. A... more Main resource of zirconia is the mineral zircon which occurs in beach sand and placer deposits. Alkali fusion and thermal plasma dissociation are the frequently adopted procedures to convert zircon to zirconia. Synthesis of different zirconia phases (monoclinic, cubic, and tetragonal) can be accomplished by the precise control of different operating parameters and stoichiometry of the reagents. Mesoporous and nano-zirconia which find wide application in catalysis and electronics are synthesized by different methods like solution combustion synthesis, sol–gel synthesis, hydrothermal synthesis, co-precipitation, and solid-phase sintering. Recently, biosynthesis of zirconia has taken a quantum leap due to environmental concerns. The synthesized zirconia is characterized by various chemical, physical, and instrumental methods to find out composition, crystal structure, size, and morphology.
Chemistry Laboratory, Atomic Minerals Directorate for Exploration and Research, Southern Region, ... more Chemistry Laboratory, Atomic Minerals Directorate for Exploration and Research, Southern Region, Bangalore-560 072, India E-mail : [email protected] A simple and rapid inductively coupled plasma optical emission spectrometric (ICP-OES) determination of trace level rare earth elements (REEs) and Y in high purity zirconium matrix and zircon samples is described. The method involves solvent extraction separation of zirconium from 3 M HCI solution using di-(2-ethylhexyl)phosphoric acid (D<sub>2</sub>EHPA) in toluene, which selectively separates zirconium leaving behind the trace REEs and Y in aqueous media, for quantification by ICP-OES. The quantitative extraction of Tm, Yb and Lu are achieved by the addition of octanol. The method has been applied to synthetic zirconium samples doped with REEs and Y and the recoveries were quantitative. The method was extended to the determination of REEs and Y zircon samples. Accuracy of the method was checked by applying the proposed ...
High fluoride content in drinking water has deleterious effects on the human health. Several meth... more High fluoride content in drinking water has deleterious effects on the human health. Several methods are available for defluoridation, which, however, have some drawbacks. The present work aims to probe the possible use of compositionally diverse rocks and minerals for defluoridation purpose. It is demonstrated in this study that carbonate-rocks (limestone, dolostone and phosphatic limestone), compared to other rocks and minerals, are effective for defluoridation, thereby indicating that the bulk composition of the rock is critical in this regard. In case of minerals, the ability of the fluoride ion to get removed depends upon the refractory nature of the mineral as well as the affinity of fluoride to interact with the constituents of the minerals. It is also observed for the first time, during the preliminary study, that the residue obtained after alkaline leaching of uranium from brecciated limestone, performed as a better defluoridizing agent. This residue which would have been d...
A simple, rapid, and quantitative precipitation separation of lanthanides, Sc, and Th suitable fo... more A simple, rapid, and quantitative precipitation separation of lanthanides, Sc, and Th suitable for the spectral interference-free ICP-AES determination in geological samples is reported. After appropriate decomposition, the lanthanides, Sc, and Th are precipitated as hydroxides with sodium hydroxide using Mg as the carrier in the presence of triethanolamine as the complexing agent. After re-dissolving in hydrochloric acid, a second ammonium hydroxide precipitation is carried out in the presence of 4 mg Fe as the carrier and the solution filtered. The residue is dissolved in hydrochloric acid, and diluted to suitable volume for ICP-AES determination. The combination of two precipitations removes the majority of the matrix elements, thus facilitating spectral interference-free determination. For uranium-rich samples, hydrogen peroxide is added prior to sodium hydroxide precipitation. The proposed method is simple and accurate. The precision (%RSD) ranges from 2-5%.
Page 1. ORIGINAL PAPER A novel method of synthesizing solid phase adsorbent silica modified with ... more Page 1. ORIGINAL PAPER A novel method of synthesizing solid phase adsorbent silica modified with xylenol orange: application for separation, pre-concentration and determination of uranium in calcium rich hydro-geochemical samples and sea waterPart 1 ...
Journal of Applied and Natural Science, Jun 20, 2023
Soil contamination by heavy metals is a concern around the world. Heavy metals in soil gain atten... more Soil contamination by heavy metals is a concern around the world. Heavy metals in soil gain attention because of their toxicological importance in the environment, agriculture and human health (Alloway, 1990). Metals like Mn, Fe, Cu, Ni, Zn and Co are required for the normal metabolic processes of living organisms, but when these are present beyond the permissible limit, it becomes harmful. Changes in physiological and biochemical processes due to heavy metal pollution in the soil cause a reduction in growth, which has been recorded and expressed in various studies. Heavy metal contamination has dire ecological consequences and it affects agricultural yield, soil fertility and soil microorganisms. Chromium (Cr) occurs in earth's crust in a trivalent state (Cr 3+), but hexavalent (Cr 6+
Zenodo (CERN European Organization for Nuclear Research), Nov 30, 2013
A simple and rapid inductively coupled plasma optical emission spectrometric (ICP-OES) determinat... more A simple and rapid inductively coupled plasma optical emission spectrometric (ICP-OES) determination of trace level rare earth elements (REEs) and Y in high purity zirconium matrix and zircon samples is described. The method involves solvent extraction separation of zirconium from 3 M HCI solution using di-(2-ethylhexyl)phosphoric acid (D 2 EHPA) in toluene, which selectively separates zirconium leaving behind the trace REEs and Y in aqueous media, for quantification by ICP-OES. The quantitative extraction of Tm, Yb and Lu are achieved by the addition of octanol. The method has been applied to synthetic zirconium samples doped with REEs and Y and the recoveries were quantitative. The method was extended to the determination of REEs and Y zircon samples. Accuracy of the method was checked by applying the proposed method to three zircon certified reference materials and the percentage error obtained was 1-6%. The values obtained agreed well with the reported values. The percentage RSD of all estimated elements varied between 1-5% at different concentration levels.
Zirconia - New Advances, Structure, Fabrication and Applications [Working Title]
Main resource of zirconia is the mineral zircon which occurs in beach sand and placer deposits. A... more Main resource of zirconia is the mineral zircon which occurs in beach sand and placer deposits. Alkali fusion and thermal plasma dissociation are the frequently adopted procedures to convert zircon to zirconia. Synthesis of different zirconia phases (monoclinic, cubic, and tetragonal) can be accomplished by the precise control of different operating parameters and stoichiometry of the reagents. Mesoporous and nano-zirconia which find wide application in catalysis and electronics are synthesized by different methods like solution combustion synthesis, sol–gel synthesis, hydrothermal synthesis, co-precipitation, and solid-phase sintering. Recently, biosynthesis of zirconia has taken a quantum leap due to environmental concerns. The synthesized zirconia is characterized by various chemical, physical, and instrumental methods to find out composition, crystal structure, size, and morphology.
Chemistry Laboratory, Atomic Minerals Directorate for Exploration and Research, Southern Region, ... more Chemistry Laboratory, Atomic Minerals Directorate for Exploration and Research, Southern Region, Bangalore-560 072, India E-mail : [email protected] A simple and rapid inductively coupled plasma optical emission spectrometric (ICP-OES) determination of trace level rare earth elements (REEs) and Y in high purity zirconium matrix and zircon samples is described. The method involves solvent extraction separation of zirconium from 3 M HCI solution using di-(2-ethylhexyl)phosphoric acid (D<sub>2</sub>EHPA) in toluene, which selectively separates zirconium leaving behind the trace REEs and Y in aqueous media, for quantification by ICP-OES. The quantitative extraction of Tm, Yb and Lu are achieved by the addition of octanol. The method has been applied to synthetic zirconium samples doped with REEs and Y and the recoveries were quantitative. The method was extended to the determination of REEs and Y zircon samples. Accuracy of the method was checked by applying the proposed ...
High fluoride content in drinking water has deleterious effects on the human health. Several meth... more High fluoride content in drinking water has deleterious effects on the human health. Several methods are available for defluoridation, which, however, have some drawbacks. The present work aims to probe the possible use of compositionally diverse rocks and minerals for defluoridation purpose. It is demonstrated in this study that carbonate-rocks (limestone, dolostone and phosphatic limestone), compared to other rocks and minerals, are effective for defluoridation, thereby indicating that the bulk composition of the rock is critical in this regard. In case of minerals, the ability of the fluoride ion to get removed depends upon the refractory nature of the mineral as well as the affinity of fluoride to interact with the constituents of the minerals. It is also observed for the first time, during the preliminary study, that the residue obtained after alkaline leaching of uranium from brecciated limestone, performed as a better defluoridizing agent. This residue which would have been d...
A simple, rapid, and quantitative precipitation separation of lanthanides, Sc, and Th suitable fo... more A simple, rapid, and quantitative precipitation separation of lanthanides, Sc, and Th suitable for the spectral interference-free ICP-AES determination in geological samples is reported. After appropriate decomposition, the lanthanides, Sc, and Th are precipitated as hydroxides with sodium hydroxide using Mg as the carrier in the presence of triethanolamine as the complexing agent. After re-dissolving in hydrochloric acid, a second ammonium hydroxide precipitation is carried out in the presence of 4 mg Fe as the carrier and the solution filtered. The residue is dissolved in hydrochloric acid, and diluted to suitable volume for ICP-AES determination. The combination of two precipitations removes the majority of the matrix elements, thus facilitating spectral interference-free determination. For uranium-rich samples, hydrogen peroxide is added prior to sodium hydroxide precipitation. The proposed method is simple and accurate. The precision (%RSD) ranges from 2-5%.
Page 1. ORIGINAL PAPER A novel method of synthesizing solid phase adsorbent silica modified with ... more Page 1. ORIGINAL PAPER A novel method of synthesizing solid phase adsorbent silica modified with xylenol orange: application for separation, pre-concentration and determination of uranium in calcium rich hydro-geochemical samples and sea waterPart 1 ...
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