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- W2024582144 abstract "Cyclic volatile methylsiloxane (cVMS) compounds are volatile, low-viscosity silicone fluids used as precursors in the synthesis of high molecular weight PDMS and as ingredients in certain personal care products. This study investigates cVMS degradation and evaporation rates in soils as influenced by molecular size, soil type, and moisture level. A temperate Michigan soil and a highly weathered Hawaiian soil were incubated with ∼40 μg of 14C-labeled cVMS/g of soil at ∼22 °C; samples were kept at 32%, 50%, 92%, and 100% relative humidity (RH) both in open and closed tubes. At each designated incubation time (from 0 to 21 days), the cVMS-containing soils were extracted, and the extracts were analyzed by liquid scintillation counting (LSC) and reverse-phase high-performance liquid chro matography (RP-HPLC). The results showed that cVMS degradation was more significant than loss by volatilization in soil with low moisture levels. Degradation reactions followed pseudo-first-order kinetics. The half-life of cVMS fluids in air-dried soils ranged from 50 min to 5 days, depending on soil type and cVMS molecular sizes. At high humidity (particularly at 100% RH), the degradation slowed, while volatilization was accelerated and became a predominant process in regulating the cVMS removal from soil. At any given moisture level, the degradation rates of cVMS were much greater in highly weathered soils (e.g., Oxisols) than in temperate soils, and the differences were more profound for small cVMS (e.g., D4). These findings demonstrate that cVMS fluids are unlikely to persist in any soils within the wide range of moisture conditions tested." @default.
- W2024582144 created "2016-06-24" @default.
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- W2024582144 date "1999-10-02" @default.
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- W2024582144 title "Fate of Cyclic Methylsiloxanes in Soils. 2. Rates of Degradation and Volatilization" @default.
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- W2024582144 doi "https://doi.org/10.1021/es990099d" @default.
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