Isotopic evidence from an Antarctic carbonaceous chondrite for two reaction pathways of extraterrestrial PAH formation

Naraoka, Hiroshi; Shimoyama, Akira; Harada, Kaoru

doi:10.1016/s0012-821x(00)00316-2

Cited by 87 publications

(83 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Powdered samples (0.5-1 g) were extracted with water and organic solvents to analyze solventextractable organic compounds such as amino acids, carboxylic acids, and polycyclic aromatic hydrocarbons (PAHs). The detailed analytical procedures and molecular distributions have been reported elsewhere (Cronin et al 1988;Shimayama et al 1985;Naraoka et al 1988Naraoka et al , 1999Naraoka et al , 2000.…”

Section: Samples and Analytical Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

A chemical sequence of macromolecular organic matter in the CM chondrites

Naraoka

Mita

Komiya

et al. 2004

Meteorit & Planetary Scien

Self Cite

View full text Add to dashboard Cite

Abstract-A new organic parameter is proposed to show a chemical sequence of organic matter in carbonaceous chondrites, using carbon, hydrogen, and nitrogen concentrations of solvent-insoluble and high-molecular weight organic matter (macromolecules) and the molecular abundance of solvent-extractable organic compounds. The H/C atomic ratio of the macromolecule purified from nine CM chondrites including the Murchison, Sayama, and seven Antarctic meteorites varies widely from 0.11 to 0.72. During the H/C change of ~0.7 to ~0.3, the N/C atomic ratio remains at ~0.04, followed by a sharp decline from ~0.040 to ~0.017 between H/C ratios from ~0.3 to ~0

show abstract

Section: Samples and Analytical Proceduresmentioning

confidence: 99%

“…e Yanai and Kojima (1995). f Shimoyama and Harada (1984); Shimoyama et al (1979Shimoyama et al ( , 1985Shimoyama et al ( , 1986Shimoyama et al ( , 1989; Naraoka et al (1988Naraoka et al ( , 1999Naraoka et al ( , 2000.…”

Section: Samples and Analytical Proceduresmentioning

confidence: 99%

A chemical sequence of macromolecular organic matter in the CM chondrites

Naraoka

Mita

Komiya

et al. 2004

Meteorit & Planetary Scien

Self Cite

View full text Add to dashboard Cite

show abstract

“…PAHs can be both natural and anthropogenic origin. It can form by several pathways: biosynthesis, pyrogenic and petrogenic [1]. PAHs are able to absorb onto sediment limiting their bio-availability [2].…”

Section: Introductionmentioning

confidence: 99%

Quality, Quantity and Origin of PAHs (Polycyclic Aromatic Hydrocarbons) in Lotic Ecosystem of Al-Hilla River, Iraq

Fikrat¹,

Hassan²,

Jasim

et al. 2014

JCEA

View full text Add to dashboard Cite

Abstract:The Euphrates River is one of the major rivers in Iraq. When it reaches north of Hilla city, it will be divided in two branches. One of these braches flows toward Hilla city. On this branch, six locations were studied for the water quality of the Euphrates water. The present paper is aimed to fill the gap of information of the presence of PAHs (poly aromatic hydrocarbons) in water and sediment of Al-Hilla River, as well as to determine the quality and quantity of some PAHs. The depth of the river ranges from 2 m to 6 m. The quality, quantity and the origin of PAHs were studied in the water and sediment of Al-Hilla River. In addition, some physical and chemical properties were studied at six sites along the studied area, for the period March, 2010 to February, 2011. Sixteen PAHs that are listed by USEPA (US Environmental Protection Agency) as priority pollutants (Nap (naphthalene), Acpy ,h)anthracene), B(ghi)P (benzo(ghi)perylene) and Ind (indeno (1,2,3-cd) pyrene)) were detected in Al-Hilla river. High concentrations of PAHs were detected in the sediment relative to that within the water. The present study revealed that the origin of PAHs in water and sediment might be the pyrogenic origin.

show abstract

“…Since the approach relies on the ability of analytes to be separated gas chromatographically, volatile meteoritic compounds with hydrocarbon skeletons and relatively few functional groups have been the main focus of investigation to date. Starting with a study by Yuen et al (1984), systematic trends in carbon isotope compositions have been observed for a number of homologous series in Murchison extracts (Engel et al 1990;Gilmour & Pillinger 1994;Engel & Macko 1997;Naraoka et al 2000). C 1 -C 5 aliphatic hydrocarbons, amino acids, carboxylic acids and sulfonic acids from the Murchison meteorite all appear to follow a common trend with d 13 C values generally decreasing as the amount of carbon in the molecules increases.…”

Section: Molecular-level Stable Isotope Analysismentioning

confidence: 99%

“…5). These carbon isotopic trends have been interpreted as the consequence of a synthetic process that progressively adds 12 C to the carbon skeleton with kinetic isotopic fractionation determining the distribution of carbon isotopes between compounds rather than thermodynamic equilibrium (Gilmour & Pillinger 1994;Naraoka et al 2000). In particular, the d…”

Section: Molecular-level Stable Isotope Analysismentioning

confidence: 99%

Molecular, isotopic and in situ analytical approaches to the study of meteoritic organic material

Watson

Pearson

Sephton

et al. 2004

International Journal of Astrobiology

View full text Add to dashboard Cite

: Organic materials isolated from carbonaceous meteorites provide us with a record of pre-biotic chemistry in the early Solar System. Molecular, isotopic and in situ studies of these materials suggest that a number of extraterrestrial environments have contributed to the inventory of organic matter in the early Solar System including interstellar space, the Solar nebula and meteorite parent bodies.There are several difficulties that have to be overcome in the study of the organic constituents of meteorites. Contamination by terrestrial biogenic organic matter is an ever-present concern and a wide variety of contaminant molecules have been isolated and identified including essential plant oils, derived from either biological sources or common cleaning products, and aliphatic hydrocarbons, most probably derived from petroleum-derived pollutants. Only 25 % of the organic matter in carbonaceous chondrites is amenable to extraction with organic solvents ; the remainder is present as a complex macromolecular aromatic network that has required the development of analytical approaches that can yield structural and isotopic information on this highly complex material.Stable isotopic studies have been of paramount importance in understanding the origins of meteoritic organic matter and have provided evidence for the incorporation of interstellar molecules within meteoritic material. Extending isotopic studies to the molecular level is yielding new insights into both the sources of meteoritic organic matter and the processes that have modified it.Organic matter in meteorites is intimately associated with silicate minerals and the in situ examination of the relationships between organic and inorganic components is crucial to our understanding of the role of asteroidal processes in the modification of organic matter and, in particular, the role of water as both a solvent and a reactant on meteorite parent bodies.

show abstract

Isotopic evidence from an Antarctic carbonaceous chondrite for two reaction pathways of extraterrestrial PAH formation

Cited by 87 publications

References 24 publications

A chemical sequence of macromolecular organic matter in the CM chondrites

A chemical sequence of macromolecular organic matter in the CM chondrites

Quality, Quantity and Origin of PAHs (Polycyclic Aromatic Hydrocarbons) in Lotic Ecosystem of Al-Hilla River, Iraq

Molecular, isotopic and in situ analytical approaches to the study of meteoritic organic material

Contact Info

Product

Resources

About