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- W1566504916 abstract "Abstract Time constraints associated with conducting long‐term (>20 yr) field experiments to test the stability of drinking water treatment residuals (WTR) sorbed phosphorus (P) inhibit improved understanding of the fate of sorbed P in soils when important soil properties (e.g., pH) change. We used artificially aged samples to evaluate aging and pH effects on lability of WTR‐immobilized P. Artificial aging was achieved through incubation at elevated temperatures (46 or 70°C) for 4.5 yr, and through repeated wetting and drying for 2 yr. Using a modified isotopic ( 32 P) dilution technique, coupled with a stepwise acidification procedure, we monitored changes in labile P concentrations over time. This technique enabled evaluation of the effect of pH on the lability of WTR‐immobilized P. Within the pH range of 4 to 7, WTR amendment, coupled with artificial aging, ultimately reduced labile P concentrations by ≥75% relative to the control (no‐WTR) samples. Soil samples with different physicochemical properties from two 7.5‐yr‐old, one‐time WTR‐amended field sites were utilized to validate the trends observed with the artificially aged samples. Despite the differences in physicochemical properties among the three (two field‐aged and one artificially aged) soil samples, similar trends of aging and pH effects on lability of WTR‐immobilized P were observed. Labile P concentrations of the WTR‐amended field‐aged samples of the two sites decreased 6 mo after WTR amendment and the reduction persisted for 7.5 yr, ultimately resulting in ≥70% reduction, compared to the control plots. We conclude that WTR application is capable of reducing labile P concentration in P‐impacted soils, doing so for a long time, and that within the commonly encountered range of pH values for agricultural soils WTR‐immobilized P should be stable." @default.
- W1566504916 created "2016-06-24" @default.
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- W1566504916 date "2007-07-01" @default.
- W1566504916 modified "2023-09-27" @default.
- W1566504916 title "Lability of Drinking Water Treatment Residuals (WTR) Immobilized Phosphorus" @default.
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- W1566504916 doi "https://doi.org/10.2134/jeq2006.0535" @default.
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