Radium geochemistry in Na–Cl type groundwater in Niigata Prefecture, Japan

Tomita, Junpei; Satake, Hiroshi; Fukuyama, Takeshi; Sasaki, Keiichi; Sakaguchi, Aya; Yamamoto, Masayoshi

doi:10.1016/j.jenvrad.2009.10.009

Cited by 21 publications

(7 citation statements)

References 36 publications

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“…Thus, for a groundwater with a specific Uaq speciation and concentration, the RaGW can be used to characterize the chemical composition of the nearby fracture surface. The Krishnaswami et al, 1982, Vengosh et al, 2009, Tomita et al, 2014 at Stripa, Sweden (Andrews et al, 1989), 0.2 -75 throughout Finland (Asikainen & Kahlos 1979;Asikianen, 1981), and 0.2 -7 elsewhere (Vinson et al, 2009;Tomita et al, 2010Tomita et al, , 2016.…”

Section: U/th Rock Ratios Provided By Ra Isotopesmentioning

confidence: 99%

Radium isotopes to trace uranium redox anomalies in anoxic groundwater

et al. 2020

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Section: U/th Rock Ratios Provided By Ra Isotopesmentioning

confidence: 99%

Radium isotopes to trace uranium redox anomalies in anoxic groundwater

et al. 2020

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“…34,35 The infiltration of brines from oil production into groundwater can alter salinity, pH, and redox conditions, releasing Ra from aquifer sediments to groundwater. 36,37 The spill of organic chemicals that reaches the subsurface is another example of anthropogenic influence on aquifer geochemical conditions that could potentially impact Ra occurrence in groundwater. This study evaluates Ra ( 226 Ra + 228 Ra) and parent nuclide (e.g., 238 U) occurrence in a sandstone aquifer contaminated with a mixture of chlorinated solvents, ketones, and aromatics occurring as a dense nonaqueous phase liquid (DNAPL) in the source zone.…”

Section: ■ Introductionmentioning

confidence: 99%

“…While these conditions can occur naturally, anthropogenic activities can also alter aquifer geochemical conditions and subsequently influence Ra occurrence in groundwater. For example, increased TDS due to road salt application results in competition for sorption sites and the prevalence of mobile Ra-chloride complexes, increasing Ra activities in groundwater over decadal timescales. − Seawater intrusion can also increase aquifer TDS, subsequently mobilizing Ra. , The infiltration of brines from oil production into groundwater can alter salinity, pH, and redox conditions, releasing Ra from aquifer sediments to groundwater. , …”

Section: Introductionmentioning

confidence: 99%

Elevated Radium Activity in a Hydrocarbon-Contaminated Aquifer

Plechacek

Mathews

et al. 2023

Environ. Sci. Technol.

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Hydrocarbon spills that reach the subsurface can modify aquifer geochemical conditions. Biogeochemical zones typically form proximal to the source zone that include iron (Fe(III)) and manganese (Mn(III/IV)) (hydr)oxide reduction, with potential to release associated geogenic contaminants to groundwater. Here, multi-level monitoring systems are used to investigate radium (226Ra, 228Ra) activities in an aquifer contaminated with a mixture of chlorinated solvents, ketones, and aromatics occurring as a dense non-aqueous phase liquid in the source zone. 226Ra activities are up to 10 times higher than background 60 m downgradient from the source zone, where pH is lower, total dissolved solid concentrations are higher, and conditions are methanogenic. Correlations indicate that Fe and Mn (hydr)oxide reduction and sorption site competition are likely responsible for elevated Ra activities within the dissolved phase plume. 226Ra activities return to background within the Fe(III)/SO4 2–-reducing zone 600 m downgradient from the source, near the middle of the dissolved phase plume. Geochemical models indicate that sorption to secondary phases (e.g., clays) is important in sequestering Ra within the plume. Although maximum Ra activities within the plume are well below the U.S. drinking water standard, elevated activities compared to background emphasize the importance of investigating Ra and other trace elements at hydrocarbon-impacted sites.

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“…A number of geochemical characteristics and processes occurring within geologic units containing U and Th in the MCOAS impact Ra partitioning to aquifer solids and can mobilize Ra to the groundwater system (Mathews et al, 2018; Stackelberg et al, 2018). Elevated dissolved Ra concentrations are commonly associated with low dissolved oxygen (DO) or high total dissolved solids (TDS) due to increased ion competition and/or loss of sorption sites; these conditions are frequently found in confined aquifer systems that contain older, more mineralized water (Ayotte et al, 2011; Gilkeson, 1984; Grundl & Cape, 2006; Krishnaswami et al, 1991; Stackelberg et al, 2018; Szabo, de Paul, et al, 2012; Szabo, Fischer, & Hancock, 2012; Tomita et al, 2010; Vinson et al, 2009; Vinson et al, 2013; Wilson, 2012). For example, increased aqueous Ra (>185 mBq/L) is correlated with anoxic conditions in particular, due to the dissolution or absence of iron and manganese (hydro) oxide minerals releasing previously sorbed Ra (Reynolds et al, 2003; Tricca et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Comparison of radium analytical methods for municipal drinking water well operation

Mathews

Scott²,

Hunt

et al. 2022

AWWA Water Science

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Radium (Ra) is a geogenic contaminant that occurs at high levels in the Midwestern Cambrian-Ordovician aquifer system (MCOAS), a regionally important sandstone and carbonate drinking water aquifer. Water utilities using the MCOAS often must adopt treatment methods or use alternative water sources to maintain high-quality drinking water. Here, we show that Ra in water obtained from a municipal well in Wisconsin remains consistent despite variation in pumping conditions. However, widely used analytical methods (e.g., scintillation counting) for measuring Ra are less precise for quantifying Ra variability given the site conditions. Although not currently used for EPA compliance, mass spectrometry improves the precision of Ra measurements by an order of magnitude over the currently used counting method (e.g., 95 ± 3 mBq/L vs. 110 ± 30 mBq/L) at the concentrations observed in this study. The use of more precise analytical methods will increase understanding of trends in Ra levels important for operating public water systems.

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Radium geochemistry in Na–Cl type groundwater in Niigata Prefecture, Japan

Cited by 21 publications

References 36 publications

Radium isotopes to trace uranium redox anomalies in anoxic groundwater

Radium isotopes to trace uranium redox anomalies in anoxic groundwater

Elevated Radium Activity in a Hydrocarbon-Contaminated Aquifer

Comparison of radium analytical methods for municipal drinking water well operation

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