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Extracted pore water (2 to 3 ml) and overlying water samples were divided into two portions: one left unacidified and used for Br, Cl, alkalinity, and NH4+ analyses, and one acidified to 0.1N with HCl and analyzed for dissolved inorganic phostphate (DIP ~HPO42−), NO3, Mn2+, Si(OH)4, Mn2+, and Fe2+ as permitted by total sample sizes. A subset of Br, Cl, alkalinity, and NH4+ data is reported here. Cl (total halides corrected for Br) was measured in triplicate on 20-μl samples using a potentiometric titration with Ag+ (precision, 1%; Radiometer CMT10); Br was measured in triplicate on 25-μl samples using a 96-well plate modification of the phenol red–bromophenol blue method (precisions, 2 to 5%) (30); alkalinity was measured in triplicate on 100-μl samples using a 96-well plate modification of the formic acid–bromophenol blue method (precisions, 3 to 5%) (31).

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