Mobility and speciation of geogenic arsenic in bedrock groundwater from the Canadian Shield in western Quebec, Canada

Bondu, Raphaël; Cloutier, Vincent; Rosa, Éric; Benzaazoua, Mostafa

doi:10.1016/j.scitotenv.2016.08.210

Cited by 62 publications

(36 citation statements)

References 34 publications

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“…Today, this arsenic is most likely being released into groundwater primarily through oxidation of authigenic sulfide minerals in the Neoproterozoic epiclastics unit, although oxidation of primary sulfide minerals in the felsic lavas and tuffs unit may also contribute arsenic. Oxidation of sulfide minerals and mobilization of arsenic in these units may be aided by existing fractures and well boreholes as suggested by Schreiber et al (2000); Abraham (2009), and Bondu et al (2017). While the majority of bedrock in Orange County, NC is crystalline with low permeability and secondary porosity, the Neoproterozoic epiclastics unit likely has much higher permeability and porosity due to its depositional history and only low-grade metamorphism.…”

Section: Discussionmentioning

confidence: 98%

“…Instead, the subtropical climate of Orange County, NC most likely helps dilute arsenic concentrations and it is possible that most of the arsenic in the bedrock units has been oxidized already given the age of the bedrock. Desorption from arsenic adsorbed onto metal oxyhydroxides due to high alkalinity, increased F − , and increased pH may also contribute arsenic to groundwater (Nicolli et al, 2012;Smedley and Kinniburgh, 2013;Khair et al, 2014;Bondu et al, 2017). Desorption may not be the main mechanism of release because the characteristic features of arsenic contamination from reductive dissolution, such as high Fe and Mn and young, alluvial host aquifers (Smedley and Kinniburgh, 2013), are not observed in Orange County, NC.…”

Section: Discussionmentioning

confidence: 99%

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Examining the Geologic Link of Arsenic Contamination in Groundwater in Orange County, North Carolina

Dinwiddie

Liu

2018

Front. Earth Sci.

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Ingestion of inorganic arsenic through food and water can have severe adverse health effects on the human body. Therefore, government regulations and health guidelines for arsenic concentrations in water have been established around the world to avoid or mitigate these health effects. In recent decades, analysis of groundwater in many locations around the world have revealed arsenic concentrations that exceed government regulation levels. The section of the Carolina Terrane located in North Carolina is one of such recently discovered areas. This study investigates the relationship between the geologic units of the Carolina terrane and arsenic concentrations in well water samples in Orange County, North Carolina. Kriging interpolation mapping and multivariate analysis reveals spatial and geochemical connections between wells of detectable arsenic and the Neoproterozoic epiclastics unit and geochemical variables such as F − , pH, and alkalinity. These associations imply that arsenic in Orange County, NC is being mobilized from authigenic arsenic-bearing sulfide minerals in the Neoproterozoic epiclastics bedrock unit by oxidative release likely associated with increased F − , pH, and alkalinity.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Examining the Geologic Link of Arsenic Contamination in Groundwater in Orange County, North Carolina

Dinwiddie

Liu

2018

Front. Earth Sci.

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“…SBGC alone does not predict GW As hazard; having As rich soil or mine spoil influencing borehole, GW or run off may contribute to elevated As concentrations in water among other factors (e.g., hydrology, well depth, rock structure, etc.) [ 27 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 ]. For this study, 6% of dwellings with PWS in Cornwall were previously reported by Ander et al [ 30 ] and Crabbe et al [ 31 ] to have elevated As above the PCV.…”

Section: Discussionmentioning

confidence: 99%

Hazard Ranking Method for Populations Exposed to Arsenic in Private Water Supplies: Relation to Bedrock Geology

Crabbe

Fletcher

et al. 2017

IJERPH

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Approximately one million people in the UK are served by private water supplies (PWS) where main municipal water supply system connection is not practical or where PWS is the preferred option. Chronic exposure to contaminants in PWS may have adverse effects on health. South West England is an area with elevated arsenic concentrations in groundwater and over 9000 domestic dwellings here are supplied by PWS. There remains uncertainty as to the extent of the population exposed to arsenic (As), and the factors predicting such exposure. We describe a hazard assessment model based on simplified geology with the potential to predict exposure to As in PWS. Households with a recorded PWS in Cornwall were recruited to take part in a water sampling programme from 2011 to 2013. Bedrock geologies were aggregated and classified into nine Simplified Bedrock Geological Categories (SBGC), plus a cross-cutting “mineralized” area. PWS were sampled by random selection within SBGCs and some 508 households volunteered for the study. Transformations of the data were explored to estimate the distribution of As concentrations for PWS by SBGC. Using the distribution per SBGC, we predict the proportion of dwellings that would be affected by high concentrations and rank the geologies according to hazard. Within most SBGCs, As concentrations were found to have log-normal distributions. Across these areas, the proportion of dwellings predicted to have drinking water over the prescribed concentration value (PCV) for As ranged from 0% to 20%. From these results, a pilot predictive model was developed calculating the proportion of PWS above the PCV for As and hazard ranking supports local decision making and prioritization. With further development and testing, this can help local authorities predict the number of dwellings that might fail the PCV for As, based on bedrock geology. The model presented here for Cornwall could be applied in areas with similar geologies. Application of the method requires independent validation and further groundwater-derived PWS sampling on other geological formations.

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“…For example, green space in urban areas can improve air quality, regulate climate conditions, reduce noise pollution from traffic, provide a sense of community and kinship, and increase a neighborhood's economic value [25,[60][61][62] . The natural environment also includes exposure to naturally-occurring chemical stressors such as arsenic in groundwater [63][64][65][66][67] and ionizing radiation from bedrock [68] .…”

Section: Components Of the Frameworkmentioning

confidence: 99%

Development of a Conceptual Framework Depicting a Childs Total (Built, Natural, Social) Environment in Order to Optimize Health and Well-Being

Tulve¹

2016

JEHS

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The complexity of the components and their interactions that characterize children's health and well-being are not adequately captured by current public health paradigms. Children are exposed to combinations of chemical and non-chemical stressors from their built, natural, and social environments at each lifestage throughout their lifecourse. Children's inherent characteristics (e.g., sex, genetics and epigenetic factors) and their activities and behaviors also influence their exposures to stressors from these environments. We describe a conceptual framework that illustrates the interrelationships between inherent characteristics, activities and behaviors, and stressors from the built, natural and social environments in influencing children's health and well-being as they progress through various stages of development. We demonstrate the use of this framework for two major public health concerns: childhood obesity and diminished general cognitive ability. Systematic reviews of the literature found a limited number of studies that evaluated both chemical and non-chemical stressors. For example, neighborhood-level socioeconomic factors and chlorpyrifos exposure were shown to interact to impact cognitive function and maternal self-esteem was found to modify vulnerability to prenatal lead. By better understanding these complex interactions, decision makers can make informed choices for child-specific environments that optimize health and well-being within the home and community.

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Mobility and speciation of geogenic arsenic in bedrock groundwater from the Canadian Shield in western Quebec, Canada

Cited by 62 publications

References 34 publications

Examining the Geologic Link of Arsenic Contamination in Groundwater in Orange County, North Carolina

Examining the Geologic Link of Arsenic Contamination in Groundwater in Orange County, North Carolina

Hazard Ranking Method for Populations Exposed to Arsenic in Private Water Supplies: Relation to Bedrock Geology

Development of a Conceptual Framework Depicting a Childs Total (Built, Natural, Social) Environment in Order to Optimize Health and Well-Being

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