کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2066406 1077105 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Retention and degradation of the cyanobacterial toxin cylindrospermopsin in sediments – The role of sediment preconditioning and DOM composition
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوشیمی، ژنتیک و زیست شناسی مولکولی (عمومی)
پیش نمایش صفحه اول مقاله
Retention and degradation of the cyanobacterial toxin cylindrospermopsin in sediments – The role of sediment preconditioning and DOM composition
چکیده انگلیسی

Recent results show that cylindrospermopsin is more frequent and widespread in surface waters than previously assumed. Studies on the fate of CYN in sediments are lacking, but this is important if these resources are used for drinking-water production via sediment passage. Therefore, the aim of our study was to determine a) CYN retention in two sandy sediments as a function of flow rate, CYN concentration, the presence of DOM and the content of fines (1% and 4%, respectively) and b) the influence of sediment preconditioning and DOM composition of the water (aquatic DOM versus DOM released from lysed cells) on CYN degradation. Retention of CYN proved negligible under the investigated conditions. Degradation in virgin sediments showed the highest lag phases (20 days). Preconditioned sediments showed no lag phase. The presence of aquatic DOM yielded highest degradation rates (κ1 = 0.46 and 0.49 day−1) without a lag phase. Readily available organic carbon sources were preferentially metabolized and hence induced a lag phase. Thus, the presence and composition of DOM in the water proved important for both CYN degradation rates in preconditioned sediments and for the lag phase. Cylindrospermopsin degradation took place solely in the sediment and not in the water body.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Toxicon - Volume 55, Issue 5, May 2010, Pages 999–1007
نویسندگان
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