Vanadium In Rocks Research Articles

Vanadium in ancient sedimentary rocks of marine origin

The distribution of vanadium and vanadyl porphyrins in fractions (extractable organic, inorganic and kerogen) of the Serpiano marl and the La Luna shaly limestone has been determined by employing a variety of geochemical and spectroscopic techniques including atomic absorption, atomic emission, electronic absorption and electron spin resonance spectroscopies. High levels of vanadium and vanadyl porphyrins were found with the major part of the total vanadium located in the kerogen fractions of both rocks. In contrast, while the kerogen of the La Luna rock also contained the major fraction of total vanadyl porphyrins (70%), the corresponding value for the Serpiano marl is only 30%. No vanadyl species were present in the inorganic fraction of either rock. It is suggested that the source of vanadium in these rocks is volcaniclastic materials and that the vanadyl porphyrin entities were incorporated into the kerogen structure through abiotic, geochemical modifications of biosynthetic pigment-chlorophyll.

Geochemical characteristics of vanadium in rocks and minerals from Ningwu district, China

Based upon a fairly large body of data available on vanadium in rocks and minerals from the Ningwu district of China, the distribution patterns of vanadium have been substantiated in igneous and terrestrial volcanic rocks. Also discussed are geochemical behaviors of vanadium and favorable conditions for mineralization of this element during different geological processes.

Determination of Vanadium in Rocks, Minerals, Ores, etc. with Benzohydroxamic Acid

Determination of Vanadium in Rocks, Minerals, Ores, etc. with Benzohydroxamic Acid

Atomic absorption analysis of beryllium and vanadium in rocks

原子吸光分析法による岩石中のベリリウムおよびバナジウムの定量における試料処理, 共存成分の影響, 干渉の抑制などについて検討した.一般のケイ酸塩岩石および粘土, 長石中の0.5～50ppmのベリリウム, 5～500ppmのバナジウムは, 試料を過塩素酸, 硝酸, フッ化水素酸で分解し, 希塩酸で溶解して試料溶液とし, 標準溶液にアルミニウム, カルシウム, カリウムを添加して定量した.超塩基性岩, 石灰岩, けい石試料中のベリリウムは, アセチルアセトン-クロロホルム抽出を併用することにより0.04ppm程度まで定量できた.緑柱石中のベリリウムは試料を炭酸ナトリウムとホウ酸で融解したのち希塩酸で溶解し, 所要時間約15分で定量できた.バナジウムに対する共存成分の干渉を塩酸溶液, 硫酸溶液で検討した結果, 負の干渉は硫酸溶液で多く, 溶液の活量係数に関係があることがわかった.

The spectrophotometric determination of vanadium in rocks

Vanadium in rock samples is determined, after alkaline fusion of the sample, by means of its catalytic action on the oxidation of aniline to aniline black by hydrogen peroxide. If necessary, chromium can be easily extracted to prevent interference. The sensitive procedure was applied to standard granite Gi and diabase Wi, and to the C.A.A.S. syenite i ; values of 16, 263 and 86 p.p.m., respectively, were obtained.

The determination of vanadium in rocks and meteorites by neutron-activation analysis

A method for the determination of vanadium by neutron activation analysis and its application to a variety of materials is outlined. The vanadium is separated from the irradiated material by chloroform-cupferron extractions, and the activity determined by liquid counting. The only interfering elements are molybdenum and technetium and then only in samples with relatively low vanadium content. The extent of conflicting nuclear reactions was investigated. Les auteurs proposent une méthode de dosage du vanadium par activation au moyen de neutrons. Le vanadium est ensuite séparé de l'échantillon irradié par des extractions chloroforme-cupferron. Beschreibung einer Methode zur Bestimmung von Vanadium durch Aktivierung mit Neutronen; die Abtrennung des Vanadiums erfolgt durch Extraktion mit einer Cupferron-Chloroform Lösung.

The determination of vanadium in rocks and meteorites by neutron-activation analysis

The determination of vanadium in rocks and meteorites by neutron-activation analysis