کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4425885 | 1619214 | 2009 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Organic phosphorus species in surface sediments of a large, shallow, eutrophic lake, Lake Taihu, China Organic phosphorus species in surface sediments of a large, shallow, eutrophic lake, Lake Taihu, China](/preview/png/4425885.png)
Organic phosphorus (P) fractions in surface sediments from a large shallow, eutrophic Lake Taihu, China, were extracted with 0.1 M NaOH after pre-treatment of the sediments with a solution composed of 0.1 M EDTA and 2% (w/v) Na2S2O4. Composition of organic P in the extracts was then characterized by 31P nuclear magnetic resonance spectroscopy (31P NMR). Several P species, including phosphonates, orthophosphate, orthophosphate monoesters, phospholipids, DNA, pyrophosphate and polyphosphate, were detected in the NaOH extracts. The proportion of extracted organic P to total P in sediments was negatively correlated with total P in the water column, as were the proportions for orthophosphate monoesters and DNA. This implies that the majority of organic P in surface sediments is likely stabilized in some way, and does not directly contribute to the internal loading of P from sediments.
Journal: Environmental Pollution - Volume 157, Issues 8–9, August–September 2009, Pages 2507–2513