manjeet kumar - Academia.edu (original) (raw)

Papers by manjeet kumar

Zenodo (CERN European Organization for Nuclear Research), 2013

Uranium deposits hosted lower Mahadek sandstones of Meghalaya (India) are one of the largest and ... more Uranium deposits hosted lower Mahadek sandstones of Meghalaya (India) are one of the largest and richest [average grade of-0.1% .u 3 0 8 ] of its kind in India. The paper deals with quantification of total organic carbon [TOC] in these sandstones by Walkley-Black procedure. The readily oxidisable organic carbon is oxidised with chromic acid in the presence of excess sulphuric acid without external heat applied. The excess dichromate ion is determined by titration with standard ammonium iron(ll) sulphate and the amount of oxidised material is calculated from the quantity of dichromate reduced. The TOC values along with loss on ignition [LOI] and moisture [H 2 0-] contents were correlated with uranium in these mineralised rocks.

Microchimica Acta, 2001

Pyrogallol is covalently linked with the benzene ring of Amberlite XAD-2, through an azo (±N=N±) ... more Pyrogallol is covalently linked with the benzene ring of Amberlite XAD-2, through an azo (±N=N±) spacer group and the resulting new polymer characterized by elemental analyses, thermogravimetric analysis (TGA) and infrared (IR) spectra. It has been used for separation and preconcentration of Cu(II), Cd(II), Co(II), Ni(II), Pb(II), Zn(II), Mn(II), Fe(III) and U(VI) prior to their determination by¯ame atomic absorption spectrometry (FAAS) or¯uorimetry (for U(VI) only). The pH ranges for quantitative sorption are 5.5±6.

The indicator properties of the azo dye, 2-[(4-phenylythioacetic acid )-azo]-1,8-dihydroxynaphtha... more The indicator properties of the azo dye, 2-[(4-phenylythioacetic acid )-azo]-1,8-dihydroxynaphthalene-3,6-disulphonic acid ,have been investigated to establish its suitability as an indicator in complexometric titration of calcium and magnesium. The pK values of the indicator; the stoichiometry and stability constant for the calcium and magnesium complexes are reported.

In the present work, Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) has been ... more In the present work, Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) has been used for the direct, rapid and accurate measurement of total concentration of uranium in borehole core samples. Under standard operating conditions of the instrument, the spectral line at 409.014 nm shows better signal-to-background intensity ratio and is free from spectral interferences by matrix elements present in silicate borehole core and ore samples with a detection limit of 0.025 µg ml-1 U 3 O 8. Under the optimized conditions, the reproducibility of the proposed method was checked by performing nine replicate determinations of 0.597, 0.140, 0.062 and 0.005 %U 3 O 8 over a period of nine consecutive days. The relative standard deviation (RSD) of the method was 0.79, 0.80, 2.04 and 8.10 % respectively. The proposed ICP-OES method is suitable for the determination of more than 0.001 %U 3 O 8 in silicate rock samples. The method has been applied for the determination of uranium in international standard samples, SY-2, SY-3 and uranium ore, BL-2a, IAEA-low grade uranium ores and borehole core samples. "t"-test for paired data has been applied for comparing the results obtained in the same borehole sample by ICP-OES method with those obtained by using 'differential technique in laser-induced fluorimetry method'(DT-LIF) as a reference measurement procedure. The calculated value for "t" is 0.52, which is less than the tabulated value of "t" for 20 borehole sample results (t=2.09 at 95% confidence level for n=20 results). This shows that the results of the measurements carried out without any chemical preparation or extraction by both the ICP-OES and 'differential technique in laser-induced fluorimetry' are not significantly different. The results of uranium content compare favorably with those obtained by using conventional fluorimetry.

J. Anal. At. Spectrom., 2014

A differential inductively coupled plasma emission spectrometry as a relative reference measureme... more A differential inductively coupled plasma emission spectrometry as a relative reference measurement procedure for the determination of total mass fraction of uranium in mineralized rocks, ores and similar matrices is presented.

The Analyst, 2000

Amberlite XAD-2 was functionalized with Tiron (disodium salt of 1,2-dihydroxybenzene-3,5-disulfon... more Amberlite XAD-2 was functionalized with Tiron (disodium salt of 1,2-dihydroxybenzene-3,5-disulfonic acid) by coupling it through an-NNN-spacer. The resulting chelating resin, characterized by elemental analyses, thermogravimetric analysis and infrared (IR) spectra, was used to preconcentrate Cu

The Analyst, 1993

Many methods and techniques are available for the determination of the rare earth elements (REE).... more Many methods and techniques are available for the determination of the rare earth elements (REE).1-3 Atomic absorption spectrometry (AAS) allows the precise and accurate determination of REE.4-8 Flame atomic emission methods have also been reported for ethanolic ...

The Analyst, 1994

Introduction In 1968, the International Union of Pure and Applied Chemistry (IUPAC) recommended t... more Introduction In 1968, the International Union of Pure and Applied Chemistry (IUPAC) recommended that 'rare earth elements' (REE)' should refer to the elements Sc, Y and La and to the lanthanides (atomic numbers 21, 39, 57 and 58-71, respect-ively). The lightest element in Group IIIA, ...

Talanta, 2000

A stable chelating resin matrix was synthesized by covalently linking o-aminophenol (o-AP) with t... more A stable chelating resin matrix was synthesized by covalently linking o-aminophenol (o-AP) with the benzene ring of the polystyrene-divinylbenzene resin, Amberlite XAD-2, through aN N-group. Elemental analyses, thermogravimetric analysis (TGA) and infrared spectra have characterized the resulting chelating resin. It has been used to preconcentrate Cu 2 + , Cd 2 + , Co 2 + , Ni 2 + , Zn 2 + and Pb 2 + , prior to their determination by flame atomic absorption spectrometry. The optimum pH values for quantitative sorption of Cu, Cd, Co, Ni, Zn and Pb are 6.

Talanta, 2004

A novel instrumental technique for the direct, fast, accurate, and precise determination of urani... more A novel instrumental technique for the direct, fast, accurate, and precise determination of uranium in concentrates and other U-rich materials (as well as to mineralized rocks) is presented. The proposed technique is an absolute methodology, based on the comparison of the fluorescence of the accurately known standard with a sample of similar but unknown concentration in the low operational range of the instrument (on same sample-dilution basis), by the use of H 3 PO 4-NH 4 H 2 PO 4 as a fluorescence-enhancing reagent. The relative standard deviation of the proposed technique was 0.5-0.9% (n = 9) at 18.1, 36.2, 61.2, and 99.6% U 3 O 8. The proposed technique is suitable for the determination of uranium in samples arising from exploration projects, ores from mining operations, mill process samples, uranium ore concentrates leading to fuel fabrication as well as samples from environmental monitoring containing up to 100% uranium. The results are in good agreement with those obtained by titrimetric, gravimetric, and TBP extraction-H 2 O 2 spectrophotometric methods. The precision of the technique is within the acceptable 'pure geochemistry' type of analysis (R.S.D. ∼ 1.0%) and is comparable even those obtained with titrimetric and gravimetric assay. The proposed differential technique coupled with flow injection may open up new advancement in instrumentation leading to design and development of microchemielectronic devices for direct on-line determination, more compatible with the tools of computer age as also to help in handling of radioactive solutions in chemical laboratories in uranium processing industries.

Analyst, 1993

Many methods and techniques are available for the determination of the rare earth elements (REE).... more Many methods and techniques are available for the determination of the rare earth elements (REE).1-3 Atomic absorption spectrometry (AAS) allows the precise and accurate determination of REE.4-8 Flame atomic emission methods have also been reported for ethanolic ...

Analyst, 1994

Introduction In 1968, the International Union of Pure and Applied Chemistry (IUPAC) recommended t... more Introduction In 1968, the International Union of Pure and Applied Chemistry (IUPAC) recommended that 'rare earth elements' (REE)' should refer to the elements Sc, Y and La and to the lanthanides (atomic numbers 21, 39, 57 and 58-71, respect-ively). The lightest element in Group IIIA, ...

Talanta, 2000

A stable chelating resin matrix was synthesized by covalently linking o-aminophenol (o-AP) with t... more A stable chelating resin matrix was synthesized by covalently linking o-aminophenol (o-AP) with the benzene ring of the polystyrene-divinylbenzene resin, Amberlite XAD-2, through aN N-group. Elemental analyses, thermogravimetric analysis (TGA) and infrared spectra have characterized the resulting chelating resin. It has been used to preconcentrate Cu 2 + , Cd 2 + , Co 2 + , Ni 2 + , Zn 2 + and Pb 2 + , prior to their determination by flame atomic absorption spectrometry. The optimum pH values for quantitative sorption of Cu, Cd, Co, Ni, Zn and Pb are 6.

Page 1. Metal ion enrichment with Amberlite XAD-2 functionalized with Tiron: analytical applicati... more Page 1. Metal ion enrichment with Amberlite XAD-2 functionalized with Tiron: analytical applications Manjeet Kumar,a DPS Rathorea and Ajai K. Singh*b a Chemistry Group, Atomic Minerals Directorate for Exploration and Research ...

Accreditation and Quality Assurance, 2012

Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. Th... more Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.

Analytica Chimica Acta, 2001

A simple, rapid, cost-effective, accurate and precise differential laser-induced fluorimetric met... more A simple, rapid, cost-effective, accurate and precise differential laser-induced fluorimetric method for the direct determination of uranium in mineralised rocks at the percentage level is presented, based on the comparison of the fluorescence of the standard with a sample of similar but unknown concentration on the same sample weight basis, by the use of H 3 PO 4-NH 4 H 2 PO 4 as a fluorescence enhancing reagent. The relative standard deviation of the method was 0.3-0.5% (n = 9) for 0.04 and 3.4% U 3 O 8. The proposed technique is suitable for the determination of uranium in samples containing >0.01% uranium. The method has been evaluated using standards, SY-2, SY-3, low grade uranium ore-IAEA reference samples and core samples of diverse matrices. The results are in good agreement with the published data and those obtained by conventional fluorimetry and other methods and are of comparable precision to those obtained by titrimetric assay.

Analytica Chimica Acta, 1993

The use of 2_[(4-phenylthioacetic acidJazoI-1,8-dihydroxynaphthalene-3,6-disulphonic acid as an i... more The use of 2_[(4-phenylthioacetic acidJazoI-1,8-dihydroxynaphthalene-3,6-disulphonic acid as an indicator for the titrimetric determination of both calcium and total calcium plus magnesium is reported. The variables affecting the colour change at the end-point were optimized. The method is free from most metal interferences without the need for potassium cyanide and other masking agents. The method was applied to water samples and the results obtained compared favourably with those given by standard methods.

Zenodo (CERN European Organization for Nuclear Research), 2013

Uranium deposits hosted lower Mahadek sandstones of Meghalaya (India) are one of the largest and ... more Uranium deposits hosted lower Mahadek sandstones of Meghalaya (India) are one of the largest and richest [average grade of-0.1% .u 3 0 8 ] of its kind in India. The paper deals with quantification of total organic carbon [TOC] in these sandstones by Walkley-Black procedure. The readily oxidisable organic carbon is oxidised with chromic acid in the presence of excess sulphuric acid without external heat applied. The excess dichromate ion is determined by titration with standard ammonium iron(ll) sulphate and the amount of oxidised material is calculated from the quantity of dichromate reduced. The TOC values along with loss on ignition [LOI] and moisture [H 2 0-] contents were correlated with uranium in these mineralised rocks.

Microchimica Acta, 2001

Pyrogallol is covalently linked with the benzene ring of Amberlite XAD-2, through an azo (±N=N±) ... more Pyrogallol is covalently linked with the benzene ring of Amberlite XAD-2, through an azo (±N=N±) spacer group and the resulting new polymer characterized by elemental analyses, thermogravimetric analysis (TGA) and infrared (IR) spectra. It has been used for separation and preconcentration of Cu(II), Cd(II), Co(II), Ni(II), Pb(II), Zn(II), Mn(II), Fe(III) and U(VI) prior to their determination by¯ame atomic absorption spectrometry (FAAS) or¯uorimetry (for U(VI) only). The pH ranges for quantitative sorption are 5.5±6.

The indicator properties of the azo dye, 2-[(4-phenylythioacetic acid )-azo]-1,8-dihydroxynaphtha... more The indicator properties of the azo dye, 2-[(4-phenylythioacetic acid )-azo]-1,8-dihydroxynaphthalene-3,6-disulphonic acid ,have been investigated to establish its suitability as an indicator in complexometric titration of calcium and magnesium. The pK values of the indicator; the stoichiometry and stability constant for the calcium and magnesium complexes are reported.

In the present work, Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) has been ... more In the present work, Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) has been used for the direct, rapid and accurate measurement of total concentration of uranium in borehole core samples. Under standard operating conditions of the instrument, the spectral line at 409.014 nm shows better signal-to-background intensity ratio and is free from spectral interferences by matrix elements present in silicate borehole core and ore samples with a detection limit of 0.025 µg ml-1 U 3 O 8. Under the optimized conditions, the reproducibility of the proposed method was checked by performing nine replicate determinations of 0.597, 0.140, 0.062 and 0.005 %U 3 O 8 over a period of nine consecutive days. The relative standard deviation (RSD) of the method was 0.79, 0.80, 2.04 and 8.10 % respectively. The proposed ICP-OES method is suitable for the determination of more than 0.001 %U 3 O 8 in silicate rock samples. The method has been applied for the determination of uranium in international standard samples, SY-2, SY-3 and uranium ore, BL-2a, IAEA-low grade uranium ores and borehole core samples. "t"-test for paired data has been applied for comparing the results obtained in the same borehole sample by ICP-OES method with those obtained by using 'differential technique in laser-induced fluorimetry method'(DT-LIF) as a reference measurement procedure. The calculated value for "t" is 0.52, which is less than the tabulated value of "t" for 20 borehole sample results (t=2.09 at 95% confidence level for n=20 results). This shows that the results of the measurements carried out without any chemical preparation or extraction by both the ICP-OES and 'differential technique in laser-induced fluorimetry' are not significantly different. The results of uranium content compare favorably with those obtained by using conventional fluorimetry.

J. Anal. At. Spectrom., 2014

A differential inductively coupled plasma emission spectrometry as a relative reference measureme... more A differential inductively coupled plasma emission spectrometry as a relative reference measurement procedure for the determination of total mass fraction of uranium in mineralized rocks, ores and similar matrices is presented.

The Analyst, 2000

Amberlite XAD-2 was functionalized with Tiron (disodium salt of 1,2-dihydroxybenzene-3,5-disulfon... more Amberlite XAD-2 was functionalized with Tiron (disodium salt of 1,2-dihydroxybenzene-3,5-disulfonic acid) by coupling it through an-NNN-spacer. The resulting chelating resin, characterized by elemental analyses, thermogravimetric analysis and infrared (IR) spectra, was used to preconcentrate Cu

The Analyst, 1993

Many methods and techniques are available for the determination of the rare earth elements (REE).... more Many methods and techniques are available for the determination of the rare earth elements (REE).1-3 Atomic absorption spectrometry (AAS) allows the precise and accurate determination of REE.4-8 Flame atomic emission methods have also been reported for ethanolic ...

The Analyst, 1994

Introduction In 1968, the International Union of Pure and Applied Chemistry (IUPAC) recommended t... more Introduction In 1968, the International Union of Pure and Applied Chemistry (IUPAC) recommended that 'rare earth elements' (REE)' should refer to the elements Sc, Y and La and to the lanthanides (atomic numbers 21, 39, 57 and 58-71, respect-ively). The lightest element in Group IIIA, ...

Talanta, 2000

A stable chelating resin matrix was synthesized by covalently linking o-aminophenol (o-AP) with t... more A stable chelating resin matrix was synthesized by covalently linking o-aminophenol (o-AP) with the benzene ring of the polystyrene-divinylbenzene resin, Amberlite XAD-2, through aN N-group. Elemental analyses, thermogravimetric analysis (TGA) and infrared spectra have characterized the resulting chelating resin. It has been used to preconcentrate Cu 2 + , Cd 2 + , Co 2 + , Ni 2 + , Zn 2 + and Pb 2 + , prior to their determination by flame atomic absorption spectrometry. The optimum pH values for quantitative sorption of Cu, Cd, Co, Ni, Zn and Pb are 6.

Talanta, 2004

A novel instrumental technique for the direct, fast, accurate, and precise determination of urani... more A novel instrumental technique for the direct, fast, accurate, and precise determination of uranium in concentrates and other U-rich materials (as well as to mineralized rocks) is presented. The proposed technique is an absolute methodology, based on the comparison of the fluorescence of the accurately known standard with a sample of similar but unknown concentration in the low operational range of the instrument (on same sample-dilution basis), by the use of H 3 PO 4-NH 4 H 2 PO 4 as a fluorescence-enhancing reagent. The relative standard deviation of the proposed technique was 0.5-0.9% (n = 9) at 18.1, 36.2, 61.2, and 99.6% U 3 O 8. The proposed technique is suitable for the determination of uranium in samples arising from exploration projects, ores from mining operations, mill process samples, uranium ore concentrates leading to fuel fabrication as well as samples from environmental monitoring containing up to 100% uranium. The results are in good agreement with those obtained by titrimetric, gravimetric, and TBP extraction-H 2 O 2 spectrophotometric methods. The precision of the technique is within the acceptable 'pure geochemistry' type of analysis (R.S.D. ∼ 1.0%) and is comparable even those obtained with titrimetric and gravimetric assay. The proposed differential technique coupled with flow injection may open up new advancement in instrumentation leading to design and development of microchemielectronic devices for direct on-line determination, more compatible with the tools of computer age as also to help in handling of radioactive solutions in chemical laboratories in uranium processing industries.

Analyst, 1993

Many methods and techniques are available for the determination of the rare earth elements (REE).... more Many methods and techniques are available for the determination of the rare earth elements (REE).1-3 Atomic absorption spectrometry (AAS) allows the precise and accurate determination of REE.4-8 Flame atomic emission methods have also been reported for ethanolic ...

Analyst, 1994

Introduction In 1968, the International Union of Pure and Applied Chemistry (IUPAC) recommended t... more Introduction In 1968, the International Union of Pure and Applied Chemistry (IUPAC) recommended that 'rare earth elements' (REE)' should refer to the elements Sc, Y and La and to the lanthanides (atomic numbers 21, 39, 57 and 58-71, respect-ively). The lightest element in Group IIIA, ...

Talanta, 2000

A stable chelating resin matrix was synthesized by covalently linking o-aminophenol (o-AP) with t... more A stable chelating resin matrix was synthesized by covalently linking o-aminophenol (o-AP) with the benzene ring of the polystyrene-divinylbenzene resin, Amberlite XAD-2, through aN N-group. Elemental analyses, thermogravimetric analysis (TGA) and infrared spectra have characterized the resulting chelating resin. It has been used to preconcentrate Cu 2 + , Cd 2 + , Co 2 + , Ni 2 + , Zn 2 + and Pb 2 + , prior to their determination by flame atomic absorption spectrometry. The optimum pH values for quantitative sorption of Cu, Cd, Co, Ni, Zn and Pb are 6.

Page 1. Metal ion enrichment with Amberlite XAD-2 functionalized with Tiron: analytical applicati... more Page 1. Metal ion enrichment with Amberlite XAD-2 functionalized with Tiron: analytical applications Manjeet Kumar,a DPS Rathorea and Ajai K. Singh*b a Chemistry Group, Atomic Minerals Directorate for Exploration and Research ...

Accreditation and Quality Assurance, 2012

Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. Th... more Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.

Analytica Chimica Acta, 2001

A simple, rapid, cost-effective, accurate and precise differential laser-induced fluorimetric met... more A simple, rapid, cost-effective, accurate and precise differential laser-induced fluorimetric method for the direct determination of uranium in mineralised rocks at the percentage level is presented, based on the comparison of the fluorescence of the standard with a sample of similar but unknown concentration on the same sample weight basis, by the use of H 3 PO 4-NH 4 H 2 PO 4 as a fluorescence enhancing reagent. The relative standard deviation of the method was 0.3-0.5% (n = 9) for 0.04 and 3.4% U 3 O 8. The proposed technique is suitable for the determination of uranium in samples containing >0.01% uranium. The method has been evaluated using standards, SY-2, SY-3, low grade uranium ore-IAEA reference samples and core samples of diverse matrices. The results are in good agreement with the published data and those obtained by conventional fluorimetry and other methods and are of comparable precision to those obtained by titrimetric assay.

Analytica Chimica Acta, 1993

The use of 2_[(4-phenylthioacetic acidJazoI-1,8-dihydroxynaphthalene-3,6-disulphonic acid as an i... more The use of 2_[(4-phenylthioacetic acidJazoI-1,8-dihydroxynaphthalene-3,6-disulphonic acid as an indicator for the titrimetric determination of both calcium and total calcium plus magnesium is reported. The variables affecting the colour change at the end-point were optimized. The method is free from most metal interferences without the need for potassium cyanide and other masking agents. The method was applied to water samples and the results obtained compared favourably with those given by standard methods.