ABSTRACT
Descloizite mineral originated from Grootfontein, South West Africa, is used in the present work. The chemical analysis of this mineral reveals the presence of V(2)O(5)=20.94 wt%, CuO=0.45 wt%, FeO in traces. An EPR study of sample confirms the presence of VO(II) and Fe(III). Optical absorption spectrum of descloizite indicates that VO(II) is present in distorted octahedral environment. NIR results are due to water fundamentals.
Subject(s)
Minerals/chemistry , Vanadates/chemistry , Absorption , Electron Spin Resonance Spectroscopy , Spectroscopy, Near-Infrared , Spectrum Analysis , TemperatureABSTRACT
Leaves of bhringaraj and guduchi herb of Kadapa district of Andhra Pradesh, India, are dried and powdered. ICP-MS analysis of samples indicates that copper is present in both the samples. An EPR study of guduchi sample also confirms the presence of Fe(III) whereas Eclipta alba confirms the presence of Fe(III), Mn(II) and Cu(II). Optical absorption spectrum of guduchi indicates that Cu(II) is present in rhombically distorted octahedral environment. NIR and IR results are due to carbonate fundamentals.
Subject(s)
Electron Spin Resonance Spectroscopy/methods , Iron/analysis , Mass Spectrometry/methods , Plant Extracts/analysis , Plants, Medicinal/metabolism , Spectrophotometry, Infrared/methods , Copper/analysis , Manganese/analysis , Optics and Photonics , Plant Extracts/chemistry , Spectrophotometry/methods , Spectroscopy, Near-Infrared/methods , Temperature , Trace ElementsABSTRACT
Clinohumite, a humite group mineral, originated from Pamir Mountains, USSR, is used in the present work. Optical absorption, electron paramagnetic resonance (EPR), near infrared (NIR) and Mössbauer techniques are used in the characterization of the mineral sample. The optical absorption spectrum indicates that Fe(II) impurity is present in two sites with distorted octahedral structure. NIR results are attributed to water fundamentals. EPR studies on powder sample confirm the presence of Mn(II) in three different sites and also an iron impurity. Mössbauer studies confirm the presence of iron impurity in two different sites.
Subject(s)
Manganese/analysis , Minerals/chemistry , Silicones/chemistry , Absorption , Electron Spin Resonance Spectroscopy , Optics and Photonics , Spectroscopy, Near-InfraredABSTRACT
A sample of prehnite from Rayalaseema zone of Andhra Pradesh, India containing about 2.565 wt.% Fe(2)O(3) is used in the present work. The mineral has been characterized by EPMA, optical absorption, EPR, NIR and Mössbauer techniques. Mössbauer studies confirm the presence of iron as an impurity in two sites. An EPR study on powder sample confirm the presence of Fe(III) impurity in the mineral. Optical absorption spectrum also indicates that Fe(III) impurity is present in two sites with octahedral structure. NIR results are due to water fundamentals.
