Hydrologic data from the study of acidic contamination in the Miami Wash-Pinal Creek area, Arizona, water years 1990-91

Longsworth, S.A.; Taylor, Andrew M.

doi:10.3133/ofr92468

Cited by 6 publications

(2 citation statements)

References 4 publications

(1 reference statement)

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“…The stream pH can be calculated from Eq. (3), Table 1 Background solute concentrations in mg/l from Longsworth and Taylor (1992) using the concentrations of alkalinity and total inorganic carbon obtained from the simulations. Assuming that precipitation of carbonate minerals is insignificant to the stream carbon balance, alkalinity can be considered a conservative quantity, since the loss or addition of dissolved CO 2 does not change the charge balance of the system (Stumm and Morgan, 1996).…”

Section: Modeling Approachmentioning

confidence: 99%

Modeling CO2 degassing and pH in a stream–aquifer system

Choi

Hulseapple

Conklin

et al. 1998

Journal of Hydrology

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Pinal Creek, Arizona receives an inflow of ground water with high dissolved inorganic carbon (57-75 mg/l) and low pH (5.8-6.3). There is an observed increase of in-stream pH from approximately 6.0-7.8 over the 3 km downstream of the point of groundwater inflow. We hypothesized that CO 2 gas-exchange was the most important factor causing the pH increase in this stream-aquifer system. An existing transport model, for coupled ground water-surface water systems (OTIS), was modified to include carbonate equilibria and CO 2 degassing, used to simulate alkalinity, total dissolved inorganic carbon (C T), and pH in Pinal Creek. Because of the non-linear relation between pH and C T , the modified transport model used the numerical iteration method to solve the non-linearity. The transport model parameters were determined by the injection of two tracers, bromide and propane. The resulting simulations of alkalinity, C T and pH reproduced, without fitting, the overall trends in downstream concentrations. A multi-parametric sensitivity analysis (MPSA) was used to identify the relative sensitivities of the predictions to six of the physical and chemical parameters used in the transport model. MPSA results implied that C T and pH in stream water were controlled by the mixing of ground water with stream water and CO 2 degassing. The relative importance of these two processes varied spatially depending on the hydrologic conditions, such as stream flow velocity and whether a reach gained or lost stream water caused by the interaction with the ground water. The coupled transport model with CO 2 degassing and generalized sensitivity analysis presented in this study can be applied to evaluate carbon transport and pH in other coupled stream-ground water systems.

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Section: Modeling Approachmentioning

confidence: 99%

Modeling CO2 degassing and pH in a stream–aquifer system

Choi

Hulseapple

Conklin

et al. 1998

Journal of Hydrology

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“…Water samples were collected on an intermittent basis from 1984 to 1987 at 12 nonproject wells and 11 surface-water sites along Miami Wash, lower Final Creek, and tributaries. Data collected by or related to this project were presented by Eychaner and others (1989), Brown (1990), and Longsworth and Taylor (1992). The reports include well-construction data, water levels in wells, streamflow discharge, and chemical analyses of ground water and surface water.…”

Section: Well-drilling Program and Data-collection Networkmentioning

confidence: 99%

Hydrology and geochemistry of aquifer and stream contamination related to acidic water in Pinal Creek basin near Globe, Arizona

Brown¹,

Favor²

1996

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iron-oxide minerals to precipitate on the streambed. Although trace metals, such as copper, nickel, The Final Creek Basin in central Arizona has zinc, and lead, are more concentrated on iron been an area of large-scale copper mining for more oxides than manganese oxides, trace-metal than 100 years. Contamination sources, mainly sorption to manganese oxides is more important impoundments of water related to mining, because manganese oxides are much more generally were acidic. A manmade lake formed in abundant than iron oxides in the streambed. 1941 and drained in 1988 probably was the single Research at the Final Creek toxic site was largest source of contamination. Concentrations of funded mainly by the U.S. Geological Survey's dissolved iron and sulfate in the lake were greater Toxic Substances Hydrology Program and has than 2,000 and 13,000 milligrams per liter, been ongoing since 1984. Focus of the study respectively. Acidic water from this lake and included the acidic plume and areas affected by other mining-related sources has generated a neutralized water. A combination of column and 15-kilometer-long plume of acidic ground water in other laboratory experiments and computer the alluvial aquifer. Contaminated ground water simulations characterized oxidation-reduction, is neutralized mainly by calcite dissolution as it neutralization, and sorption reactions that moves through the alluvium and the shallow basin evidently occur in the core of the plume. Solidfill. Acid-base, oxidation-reduction, and sorption phase associations of copper, manganese, reactions accompany the neutralization of acidic zinc, calcium, aluminum, and sulfate in the ground water. Oxidation-reduction reactions subsurface were determined through the use involve principally iron and manganese. Sorption of sequential extractions. Field sampling and of oxidized precipitates controls the distribution of laboratory work identified oxide precipitates, cobalt, copper, and nickel. These metals and other associated trace metals, and trends in water trace metals are near detection limits in neutralized chemistry in the area of perennial flow, ground water. Neutralized ground water, which had a pH of iMTRoni irriON 6.1 in 1990, discharges to the land surface to form N1 "°DUUTION a reach of perennial flow in Final Creek.

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Chemistry of manganese precipitation in Pinal Creek, Arizona, USA: A laboratory study

Hem¹,

Lind²

1994

Geochimica et Cosmochimica Acta

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Hydrologic data from the study of acidic contamination in the Miami Wash-Pinal Creek area, Arizona, water years 1990-91

Cited by 6 publications

References 4 publications

Modeling CO2 degassing and pH in a stream–aquifer system

Modeling CO2 degassing and pH in a stream–aquifer system

Hydrology and geochemistry of aquifer and stream contamination related to acidic water in Pinal Creek basin near Globe, Arizona

Chemistry of manganese precipitation in Pinal Creek, Arizona, USA: A laboratory study

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