On the basis of rapid-scan UV-vis data indicating a lack of Soret absorbance associated with separated vanadyl and nickel containing fractions, we have categorized highly polar nickel compounds as non-porphyrin in Boscan, Cerro Negro, Wilmington, and Prudhoe Bay heavy crude petroleums. Four heavy crude petroleums, Boscan, Cerro Negro, Wilmington, and Prudhoe Bay, have been examined by high-performance liquid chromatography in combination with graphite furnace atomic absorption detection (HPLC/GFAA) to provide both a vanadium fingerprint and a molecular weight categorization of the vanadyl porphyrin and non-porphyrin compounds present. The high-performance liquid chromatographic (HPLC) separated fractions of pyridine/water extracts of selected crude petroleums were analyzed by electron paramagnetic resonance (EPR) spectroscopy to determine the first coordination sphere around the vanadium. The slippery dick wrasse is widespread throughout the tropical and subtropical waters of the western Atlantic Ocean.

OSTI Identifier: 5156739 DOE Contract Number: AC03-76SF00098 Resource Type: Journal Article Journal Name: LBL Comput. As determined by EPR, the Boscan moderate-polar and Prudhoe Bay moderate- and low-polar fractions exhibited N/sub 2/S/sub 2/ coordination. Important structural aspects are emerging from the presented data: (1) There are non-porphyrin metal complexes in the crude petroleums. It has a flat entry rocker and the wider outline provides more volume to get you through the dead sections with speed. The vanadium histogrammic profiles, obtained using reverse-phase more » and size-exclusion HPLC/GFAA analysis for compounds extracted from the n-pentane (40:1) precipitated asphaltenes, were similar when compared to the pyridine/water extracts from the heavy crude petroleums.Juveniles are usually white and have two dark stripes, but the lower (abdominal) stripe may be faint.

These interests include the identification of trace metal non-porphyrin compounds in heavy crude petroleums.

The extracts were separated by polarity on an octadecylsilane column (ODS) into three fractions - low, moderate, and high polarity. By using the Web site, you confirm that you have read, understood, and agreed to be bound by the Terms and Conditions. Cerro Negro and Wilmington moderate-polar fractions showed S/sub 4/ coordination, and the Boscan low-polar fraction showed N/sub 4/ coordination.