Recent developments in chromatographic techniques for the separation and quantitative
characterization of petroleum and related products are highlighted. Specifically, scope …

Challenges to identification, characterisation and determination of element species in crude
and residual oils, oil fractions, natural gas and gas condensates, and related products are …

During the upgrading of heavy petroleum, asphaltene is the most problematic impurity since
it is the main cause of catalyst deactivation and sediments formation. Exploring many …

The coupling of size exclusion chromatography (SEC) and normal phase (NP) HPLC using
entirely organic mobile phases (tetrahydrofuran, xylene) with inductively coupled plasma …

Size exclusion chromatography (SEC), also referred to as gel permeation, gel filtration, steric
exclusion, or gel chromatography, is an entropically controlled separation technique that …

Three extraction methods to isolate metalloporphyrins from a heavy crude oil have been
developed. The metalloporphyrins were isolated from Boscan crude oil by (a) SARA …

Using a hybrid computational strategy, based on semiempirical quantum chemical (ZINDO)
and molecular mechanics estimations of interaction energies, as well as experimental data …

Vanadate and vanadium compounds exist in many environmental, biological and clinical
matrices, and despite the need only limited progress has been made on the analysis of …

A method of sequential liquid–solid extraction (leaching) has been developed to extract the
V, Ni, and S compounds present in asphaltenes (n-C7) according to their molecular weight …

A HPLC procedure has been optimized and successfully applied to porphyrins of
environmental interest, such as etio and octaethylporphyrins and their VO and Ni …