Naphthenic acids in groundwater overlying undeveloped shale gas and tight oil reservoirs
| Autor: | John V. Headley, Kerry M. Peru, Jason M. E. Ahad, Hooshang Pakdel, Denis Lavoie, René Lefebvre |
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| Rok vydání: | 2017 |
| Předmět: |
Canada
Environmental Engineering Health Toxicology and Mutagenesis Carboxylic Acids 010501 environmental sciences Natural Gas 01 natural sciences Mass Spectrometry chemistry.chemical_compound Environmental Chemistry Organic matter Oil and Gas Fields Organic Chemicals Groundwater 0105 earth and related environmental sciences chemistry.chemical_classification Total organic carbon Carbon Isotopes 010401 analytical chemistry Tight oil Public Health Environmental and Occupational Health Quebec General Medicine General Chemistry Pollution Hydrocarbons 0104 chemical sciences Hydrocarbon Petroleum chemistry Isotopes of carbon Environmental chemistry Oil shale Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Chemosphere. 191 |
| ISSN: | 1879-1298 |
| Popis: | The acid extractable organics (AEOs) containing naphthenic acids (NAs) in groundwater overlying undeveloped shale gas (Saint-Edouard region) and tight oil (Haldimand sector, Gaspe) reservoirs in Quebec, Canada, were analysed using high resolution Orbitrap mass spectrometry and thermal conversion/elemental analysis - isotope ratio mass spectrometry. As classically defined by CnH2n+ZO2, the most abundant NAs detected in the majority of groundwater samples were straight-chain (Z = 0) or monounsaturated (Z = -2) C16 and C18 fatty acids. Several groundwater samples from both study areas, however, contained significant proportions of presumably alicyclic bicyclic NAs (i.e., Z = -4) in the C10-C18 range. These compounds may have originated from migrated waters containing a different distribution of NAs, or are the product of in situ microbial alteration of shale organic matter and petroleum. In most groundwater samples, intramolecular carbon isotope values generated by pyrolysis (δ13Cpyr) of AEOs were on average around 2-3‰ heavier than those generated by bulk combustion (δ13C) of AEOs, providing further support for microbial reworking of subsurface organic carbon. Although concentrations of AEOs were very low ( |
| Databáze: | OpenAIRE |
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