کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4424616 1619195 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Extractability and bioavailability of Pb and As in historically contaminated orchard soil: Effects of compost amendments
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Extractability and bioavailability of Pb and As in historically contaminated orchard soil: Effects of compost amendments
چکیده انگلیسی

The availability of Pb and As in an historically contaminated orchard soil, after amendment with compost and aging in the field, was determined by single-step chemical extraction with 1.0 M ammonium acetate at pH 4.8, sequential extraction using the modified BCR test, and a redworm bioassay in the laboratory. The efficiency of soil Pb extraction by ammonium acetate was greater at higher total soil Pb but was reduced by compost amendment. Conversely, the extraction efficiency of total soil As increased with compost amendment, but was not sensitive to total soil As. The redworm bioassay indicated Pb (but not As) bioavailability to be reduced by soil amendment with compost, a result consistent with the ammonium acetate extraction test but not reflected in modified BCR test. Electron microprobe studies of the orchard soil revealed Pb and As to be spatially associated in discrete particles along with phosphorus and iron.


► Soil Pb and As in an old orchard were concentrated in discrete particles.
► Compost amendment of contaminated soil reduced Pb bioavailability.
►  Compost amendment of contaminated soil did not reduce As bioavailability.
► Ammonium acetate extraction test reflected bioavailability of soil Pb and As.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 177, June 2013, Pages 90–97
نویسندگان
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