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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
purification
Removal performance and adsorption behaviour on Mg-based adsorbents in As(III) and F simultaneous removal as in comparison with As(V) Available to Purchase
Evaluation of Plant-Based Natural Extracts as Coagulants for Surface Water Treatment Available to Purchase
Purification of Iranian bentonite for organoclay synthesis for use in clay–polymer composites Available to Purchase
Optimized purification procedure for Iranian calcium bentonite for producing montmorillonite nanosheets Available to Purchase
Synthesis and Characterization of Al-Pillared Bentonite for Remediation of Chlorinated Pesticide-Contaminated Water Available to Purchase
Assessment of Domestic Water Use Pattern and Drinking Water Quality of Sikkim, North Eastern Himalaya, India: A Cross-sectional Study Available to Purchase
Composite materials based on zeolite stilbite from Faroe Islands for the removal of fluoride from drinking water Available to Purchase
Vanadium isotope composition of crude oil: effects of source, maturation and biodegradation Available to Purchase
Abstract: We present a study of vanadium (V) isotope compositions for 17 crude oils spanning a wide range of concentrations and formation ages. Bulk organic geochemical and biomarker compositions are investigated for 11 co-genetic crude oils from the Barbados oil field. About 2‰ V isotope fractionation was observed and they are primarily correlated with V/Ni ratios and most likely reflect the depositional environment of the petroleum source rocks. Factors such as the lithology of the source rocks, Eh and pH of the depositional environment, and possibly the V isotope composition of seawater could all play a role in the V isotope composition. The Eh and pH conditions determine the speciation and coordination of V ions in fluids, whereas the lithology of the source rock defines the competing phases for available V ions in solution. The V isotopes are significantly modified by maturation and biodegradation. The V isotope fractionation during biodegradation has most probably resulted from the microbial activity-induced changes in the species and coordination geometries of V ions in fluids. The progressive decrease of δ 51 V with the increase of maturation might suggest a preferential loss of 51 V during de-metalation and/or a preferential incorporation of 50 V in the newly formed V-organometallic compounds.