Aqueous geochemistry and diagenesis in the eastern Snake River Plain aquifer system, Idaho

Wood, Warren W.; Low, Walton H.

doi:10.1130/0016-7606(1986)97<1456:agadit>2.0.co;2

Cited by 64 publications

(41 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Groundwater in the eastern Snake River Plain aquifer is described as a calcium-sodium-bicarbonate type that is slightly alkaline (ca. pH 8), oligotrophic, and saturated with dissolved oxygen (42). The groundwater was collected (following standard three-well-volume purging) from a 213-m depth in an uncased well (USGS-103) located in a pristine location where total organic carbon is about 0.3 mg liter Ϫ1 (R. Bartholomay, U.S. Geological Survey [USGS], personal communication).…”

Section: Methodsmentioning

confidence: 99%

Comparison of Extracellular Enzyme Activities and Community Composition of Attached and Free-Living Bacteria in Porous Medium Columns

Lehman

O'Connell

2002

Appl Environ Microbiol

View full text Add to dashboard Cite

Free-living and surface-associated microbial communities in sand-packed columns perfused with groundwater were compared by examination of compositional and functional characteristics. The composition of the microbial communities was assessed by bulk DNA extraction, PCR amplification of 16S ribosomal DNA fragments, separation of these fragments by denaturing gradient gel electrophoresis, and sequence analysis. Community function was assessed by measurement of ␤-glucosidase and aminopeptidase extracellular enzyme activities. Free-living populations in the aqueous phase exhibited a greater diversity of phylotypes than populations associated with the solid phase. The attached bacterial community displayed significantly greater ␤-glucosidase and aminopeptidase enzyme activities per volume of porous medium than those of the free-living community. On a per-cell basis, the attached community had a significantly higher cell-specific aminopeptidase enzyme activity (1.07 ؋ 10 ؊7 nmol cell ؊1 h ؊1 ) than the free-living community (5.02 ؋ 10 ؊8 nmol cell ؊1 h ؊1 ). Conversely, the free-living community had a significantly higher cell-specific ␤-glucosidase activity (1.92 ؋ 10 ؊6 nmol cell ؊1 h ؊1 ) than the surface-associated community (6.08 ؋ 10 ؊7 nmol cell ؊1 h ؊1 ). The compositional and functional differences observed between these two communities may reflect different roles for these distinct but interacting communities in the decomposition of natural organic matter or biodegradation of xenobiotics in aquifers.Functional differences between free-living and particle-or macroaggregate-associated bacteria have been documented in the water columns of aquatic (14, 31, 37) and marine (20,32,35,39,40) environments. Because cell attachment is known to strongly but unpredictably affect cell physiology (29, 41), there has been uncertainty whether these functional differences are due to changes in functional expression or differences in community composition (12,22,32,35). Independent reports of compositional differences in free-living and attached bacteria in marine water columns (1,5,12) and two studies in which aspects of both structure and function of these two communities were measured (10, 35) indicate that compositional differences may be responsible (in part) for the observed functional differences.The current working model in aquatic and marine environments is that attached and unattached bacteria comprise two distinct but interacting communities, shaped by differential access to nutrients and susceptibility to predation (14,20,23,31,32,35,39,40). For example, bacteria attached to particulate matter suspended in water columns display greater extracellular enzyme activity than their free-living counterparts (20,22,31,32,35,39). However, uptake by the attached populations of the products of this extracellular activity appears to be uncoupled from the enzyme activity, creating a supply of usable organic carbon to free-living bacteria in the surrounding water (22,31,39).Differences in rates of polymer hydrolysis, substrate u...

show abstract

Section: Methodsmentioning

confidence: 99%

Comparison of Extracellular Enzyme Activities and Community Composition of Attached and Free-Living Bacteria in Porous Medium Columns

Lehman

O'Connell

2002

Appl Environ Microbiol

View full text Add to dashboard Cite

show abstract

“…The natural groundwater chemistry of the Snake River Plain Aquifer beneath the INEL is influenced by the chemical composition of groundwater originating outside of the INEL; precipitation, streams, rivers, and runoff; and the weathering reactions that occur as water interacts with the minerals composing the aquifer (Wood and Low 1986;. These processes result in water containing relatively high concentrations of calcium and bicarbonate as well as other components.…”

Section: -25mentioning

confidence: 99%

Idaho National Engineering Laboratory (INEL) Environmental Restoration (ER) Program Baseline Safety Analysis File (BSAF)

1995

View full text Add to dashboard Cite

“…The stratigraphy of the ESRP is composed of multiple basalt flows with thin interbeds of sedimentary silts and clays, and occasional sand and gravel layers (Colwell and Lehman 1997). Calcite precipitation is an integral reaction of the overall chemistry of the unconfined aquifer (McLing 1994, M. S. thesis, Idaho State University; Wood and Low 1986). Three of the wells sampled for this study were on INEEL property and one just south of the property boundary.…”

Section: Groundwater Samplesmentioning

confidence: 99%

“…Specific inorganic chemical constituents of the AGW included KNO 3 (0.0403 mM), MgSO 4 (0.448 mM), CaCl 2 (1.75 mM), NaNO 3 (0.044 mM), NaHCO 3 (1.1mM), and KHCO 3 (0.0623mM). Organic carbon concentrations in pristine regions of the aquifer are generally less than 0.1 mmole C / L (Wood and Low 1986;McLing 1994), so apart from the addition of 6.0 mM urea (for 20 o C experiments) and 25 mM (for 10 and 15 o C experiments), no organic carbon was added to the medium.…”

Section: Calcite Precipitation In Artificial Groundwatermentioning

confidence: 99%

“…An artificial groundwater (AGW) medium was prepared based on the aqueous chemistry of the ESRP groundwater in the vicinity of the Idaho National Engineering and Environmental Laboratory, Idaho Falls, U.S.A. Major anion and cation concentrations were taken as mean values from historical records (Wood and Low 1986). Specific inorganic chemical constituents of the AGW included KNO 3 (0.0403 mM), MgSO 4 (0.448 mM), CaCl 2 (1.75 mM), NaNO 3 (0.044 mM), NaHCO 3 (1.1mM), and KHCO 3 (0.0623mM).…”

Section: Calcite Precipitation In Artificial Groundwatermentioning

confidence: 99%

See 1 more Smart Citation

Calcite Precipitation and Trace Metal Partitioning in Groundwater and the Vadose Zone: Remediation of Strontium-90 and Other Divalent Metals and Radionuclides in Arid Western Environments

Ferris¹

2003

View full text Add to dashboard Cite

Aqueous geochemistry and diagenesis in the eastern Snake River Plain aquifer system, Idaho

Cited by 64 publications

References 0 publications

Comparison of Extracellular Enzyme Activities and Community Composition of Attached and Free-Living Bacteria in Porous Medium Columns

Comparison of Extracellular Enzyme Activities and Community Composition of Attached and Free-Living Bacteria in Porous Medium Columns

Idaho National Engineering Laboratory (INEL) Environmental Restoration (ER) Program Baseline Safety Analysis File (BSAF)

Calcite Precipitation and Trace Metal Partitioning in Groundwater and the Vadose Zone: Remediation of Strontium-90 and Other Divalent Metals and Radionuclides in Arid Western Environments

Contact Info

Product

Resources

About