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• W3125617696 endingPage "145420" @default.
• W3125617696 startingPage "145420" @default.
• W3125617696 abstract "Physical and chemical weathering of arsenic-enriched mine wastes can lead to the mobilization and dispersal of contaminated sediments into surrounding (residential) areas. Additionally, seasonal effects during dry and rainy seasons affect contaminant bioaccessibility in ways that may significantly influence risk estimates of chronic arsenic exposure for residents living near mining sites. Rainwater-transported sediments from the Red Hill Mercury Mine in Tustin, California were collected monthly over a period of 25 months and the ingestible size fraction (≤250 μm) analyzed for bulk arsenic concentration (239 ± 149 mg/kg, n = 32, 114 to 678 mg/kg), assessed for arsenic bioaccessibility (11.2 ± 6.3%, n = 32, 2.7 to 24.9%), and compared with realtime rainfall data. Arsenic bioaccessibility was highly variable and strongly negatively correlated with cumulative rainfall over the preceding 40 days (r2 = 0.51, P < 0.001). Controlled wetting/drying experiments and As speciation analyses demonstrated that this correlation primarily arose through the removal of soluble/surface-bound arsenic phases from sediments during rainwater exposure/transport, but also suggested the secondary formation of soluble arsenic phases resulting from diel humidity and temperature fluctuations during dry periods, which gradually increases the proportion of bioaccessible arsenic with time. These findings demonstrate significant seasonal variability in arsenic bioaccessibility and indicate that arsenic exposure risks through incidental ingestion in these and similar systems are highest following extended dry periods." @default.
• W3125617696 created "2021-02-01" @default.
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• W3125617696 date "2021-06-01" @default.
• W3125617696 modified "2023-10-01" @default.
• W3125617696 title "Wetting/drying cycles increase arsenic bioaccessibility in mine-impacted sediments" @default.
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• W3125617696 doi "https://doi.org/10.1016/j.scitotenv.2021.145420" @default.
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