کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4414075 1307699 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Uptake of PAHs into polyoxymethylene and application to oil-soot (lampblack)-impacted soil samples
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Uptake of PAHs into polyoxymethylene and application to oil-soot (lampblack)-impacted soil samples
چکیده انگلیسی

Polyoxymethylene (POM) is a polymeric material used increasingly in passive sampling of hydrophobic organic contaminants such as PAHs and PCBs in soils and sediments. In this study, we examined the sorption behavior of 12 PAH compounds to POM and observed linear isotherms spanning two orders of magnitude of aqueous concentrations. Uptake kinetic studies performed in batch systems for up to 54 d with two different volume ratios of POM-to-aqueous phase were evaluated with coupled diffusion and mass transfer models to simulate the movement of PAHs during the uptake process and to assess the physicochemical properties and experimental conditions that control uptake rates. Diffusion coefficients of PAHs in POM were estimated to be well correlated with diffusants’ molecular weights as DPOM∝(MW)-3DPOM∝(MW)-3, descending from 2.3 × 10−10 cm2 s−1 for naphthalene to 7.0 × 10−11 cm2 s−1 for pyrene. The uptake rates for PAHs with log Kow < 5.8 were controlled by the POM phase and the hydrophobicity of PAH compounds. For more hydrophobic PAH compounds, the aqueous boundary layer played an increasingly important role in determining the overall mass transfer rate. The POM partitioning technique was demonstrated to agree well with two other procedures for measuring PAH soil–water distribution coefficients in oil-soot (lampblack) containing soil samples.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 72, Issue 2, May 2008, Pages 272–281
نویسندگان
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