Use of Stable Oxygen and Carbon Isotope Analyses for Monitoring the Pathways and Rates of Intrinsic and Enhanced <i>in Situ</i> Biodegradation

Aggarwal, Pradeep; Fuller, Mark E.; Gurgas, Michele M.; Manning, John F.; Dillon, Michael A.

doi:10.1021/es960562b

Cited by 67 publications

(50 citation statements)

References 20 publications

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“…Owing to the fact that CO 2 (or rather H 2 CO 3 ) acts as weak acid, the consumption of CO 2 leads to an increase in pH (Haag and Westrich, 2002). Carbon isotope composition provides distinctive evidence for microbial activity, and carbon isotope ratios (υ 13 C) of dissolved inorganic carbon (DIC) are usually used as a monitoring tool to determine carbon origin (Aggarwal et al, 1997). As inferred from the composition of υD and υ 18 O, it was expected that υ 13 C of DIC in groundwater would be at a minimum value in group A among the four groups.…”

Section: Factor Analysismentioning

confidence: 99%

Multivariate statistical analysis to identify the major factors governing groundwater quality in the coastal area of Kimje, South Korea

Kim

Lee

et al. 2004

Hydrological Processes

175

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Abstract:The main purpose of this study is to identify the major factors affecting groundwater quality by means of multivariate statistical analysis of the physico-chemical compositions. Cluster analysis results show that the groundwater in the study area is classified into four groups (A, B, C and D), and factor analysis indicates that groundwater composition, 81Ð9% of the total variance of 17 variables, is mainly affected by three factors: seawater intrusion, microbial activity and chemical fertilizers. These results might be related to the geographical characteristics of the study area. The main influence on groundwater in groups B, C and D, which are close to the Yellow Sea and contain reclaimed areas, is the seawater intrusion by the present seawater, the trapped seawater, and microbial activity. Group A, however, has been used for agriculture for a long time, and thus groundwater in this group has been largely affected by chemical fertilizers. As groundwater flows from group A to group D according to its path, the governing factor of the groundwater quality gradually changes from chemical fertilizers to microbial activity and seawater intrusion.

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Section: Factor Analysismentioning

confidence: 99%

Multivariate statistical analysis to identify the major factors governing groundwater quality in the coastal area of Kimje, South Korea

Kim

Lee

et al. 2004

Hydrological Processes

175

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“…In situ degradation by natural bacterial populations has been claimed to be one of the main mechanisms for cleaning oil spills in the sea (Aggarwal et al 1997, Bolliger et al 1999, Medina-Bellver et al 2005. Several groups of bacteria have been shown to be capable of oil degradation and are present in marine communities in areas frequently exposed to hydrocarbons (Golyshin et al 2003, Martín-Gil et al 2004.…”

Section: Introductionmentioning

confidence: 99%

Enhanced bacterioplankton activity after the Prestige oil spill off Galicia, NW Spain

Bode¹,

González²,

Lorenzo³

et al. 2006

Aquat. Microb. Ecol.

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The response of coastal bacterioplankton communities to the 'Prestige' oil spill in November 2002 was investigated off A Coruña (NW Spain). Abundance and activity (leucine uptake) of bacterioplankton communities were analysed in relation to total soluble hydrocarbon concentrations (THC) measured monthly for 1 yr after the spill. Temperature, chlorophyll a, total and particulate organic carbon (TOC and POC, respectively), along with oxygen concentrations were also measured. The highest THC values (140 µg l -1 ) were found near the coast shortly after the spill, decreasing thereafter, although peak concentrations of 75 µg l -1 were detected in summer. Besides those peaks, THC was much lower and was not correlated with TOC or with bacterial abundance or activity. In contrast, bacterial variables were significantly correlated with water temperature, chlorophyll a and TOC concentrations. Compared to data obtained before the spill, bacterial abundance did not change but bacterial activity was significantly enhanced, especially during winter and summer. Potential hydrocarbon degradation by bacteria was indicated by elevated production rates and an increase in the apparent oxygen utilisation during winter. The estimated degradation rates could account for the observed decrease in THC after the initial spill. Changes in hydrocarbons after the winter, however, could not be related to bacterial production, as the latter was more related to changes in phytoplankton biomass and TOC.

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“…(e.g. Aggarwal et al 1997;Fritz et al 1989;Harrison and Thode 1958;Kaplan and Rittenberg 1964;Mizutani and Rafter 1973;Stempvoort and Krouse 1994;Trembaczowski 1994aTrembaczowski , 1995Trembaczowski and Hałas 1993).…”

Section: Reduction Of the Dissolved Sulphatementioning

confidence: 99%

S–O–C isotopic picture of sulphate–methane–carbonate system in freshwater lakes from Poland. A review

Jędrysek

2005

Environ Chem Lett

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Microbial oxidation of organic compounds (including methane), in freshwater sediments, may result in precipitation of carbonates, which may become an important geochemical archive of paleoenvironmental variations. Most probably low δ 13 C value in calcite in eutrophic systems results from an advanced oxidation of organic compounds in turbulent or/and sulphate-rich conditions. Likewise, high δ 13 C value in calcite from organic-rich sediments may evidence low redox potential of the freshwater system. Oxidation of methane and organic matter results in significant isotope effects in sulphates dissolved in water. Therefore, to better understand the origin of carbon isotope signal in carbonates, concentration and stable isotope measurements in dissolved sulphate (water column), bubble methane and calcite (freshwater sediments) have been carried out in 24 lakes, 2 ponds and 4 rivers in Poland. The highest concentration of sulphate has been detected in rivers (85.47 SO 4 2− mg/l) and an artificial lake (70.30 SO 4 2− mg/l) located in the extremely SO 4 2− -polluted region called the "Black Triangle". The lowest concentration of sulphate is found in dystrophic and mountain lakes (from 0.5 SO 4 2− to about 3 mg/l). The lowest δ 34 S(SO 4 2− ) and δ 18 O(SO 4 2− ) values occur in unpolluted lakes in eastern Poland (−0.94 and 1.38‰, respectively). The highest S and O isotopic ratios are found in a polluted lake in western Poland (δ 14 S(SO 4 2 )=12.95‰) and in a dystrophic lake in eastern Poland (δ 18 O(SO 2 4 ) = 16.15‰) respectively. It is proposed that δ 34 SO 2− 4 and ( 18 O(SO 4 2− ) values in lakes represent a good tool to assess and quantify anthropogenic impact by acid precipitation and to monitor variations in the trophic state and redox processes controlled by biodegradation of organic compounds in sediments and water column. In general, increasing depth (up to 12 m) of the water column is associated with decreasing trend the δ 13 C(CH 4 ) value from about -35 to about -78‰. However, δ 13 C value in sedimentary calcite (δ 13 C vary from -10 to 0.5‰) shows opposite trends as compared to the corresponding methane. This is probably due to redox processes and distribution of heavy isotopes between methane and calcite. Likewise, turbulent water (river) show high δ 13 C value in methane and low δ 13 C value in calcite-this is probably due to an enhanced oxidation of methane producing 13 C-depleted CO 2 . In contrast to clean lakes, it is observed that an increase of the δ 13 C(CH 4 ) value occurs with increasing depth of the water column in a strongly SO 4 2− -contaminated lake. This is probably due to a loss of biological buffering potential of the lake accompanied by an active oxidation of methane precursors.

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Use of Stable Oxygen and Carbon Isotope Analyses for Monitoring the Pathways and Rates of Intrinsic and Enhanced in Situ Biodegradation

Cited by 67 publications

References 20 publications

Multivariate statistical analysis to identify the major factors governing groundwater quality in the coastal area of Kimje, South Korea

Multivariate statistical analysis to identify the major factors governing groundwater quality in the coastal area of Kimje, South Korea

Enhanced bacterioplankton activity after the Prestige oil spill off Galicia, NW Spain

S–O–C isotopic picture of sulphate–methane–carbonate system in freshwater lakes from Poland. A review

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Use of Stable Oxygen and Carbon Isotope Analyses for Monitoring the Pathways and Rates of Intrinsic and Enhanced in Situ Biodegradation

Cited by 67 publications

References 20 publications

Multivariate statistical analysis to identify the major factors governing groundwater quality in the coastal area of Kimje, South Korea

Multivariate statistical analysis to identify the major factors governing groundwater quality in the coastal area of Kimje, South Korea

Enhanced bacterioplankton activity after the Prestige oil spill off Galicia, NW Spain

S–O–C isotopic picture of sulphate–methane–carbonate system in freshwater lakes from Poland. A review

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Enhanced bacterioplankton activity after the Prestige oil spill off Galicia, NW Spain