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- W2054826892 abstract "Under acidic conditions in the stomach of humans, the nature of phases in contaminated solids significantly influence lead (Pb) release and bioaccessibility. This study focused on Pb solid-phase speciation and release kinetics and the relationship between the two. Contaminated soil and waste materials from a Pb mining and processing site contained 279−7770 and 495−83400 mg/kg total lead (Pbt), of which 47−76% and 38−55%, respectively, were extractable (MgCl2 + NaOH + EDTA). Release rates were measured with a stirred-flow reactor under simulated gastric conditions at a pH of 1−3 and at temperatures of 278−328 K. During the first 10 min, Pb release rates at 297 K and pH 1 were high (53 and 31 mg (g of Pbt)-1 min-1, soil and waste, respectively), and most samples released >50% of Pbt within the first 10 min. Between 10 and 60 min, Pb was generally released at lower rates (11 and 3 mg (g of Pbt)-1 min-1, soil and waste, respectively). Lead release kinetics and solid-phase speciation indicate that Pb is present in at least two different solid phases. A kinetic model representing two simultaneous first-order reactions suggested the presence of a fast and a slow reacting pool; corresponding half-lives were in the range of 1 and 10 min, respectively." @default.
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- W2054826892 date "1996-02-01" @default.
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- W2054826892 title "Lead Release from Smelter and Mine Waste Impacted Materials under Simulated Gastric Conditions and Relation to Speciation" @default.
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- W2054826892 doi "https://doi.org/10.1021/es940737m" @default.
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