Speciation of organic phosphorus in a sediment profile of Lake Taihu II. Molecular species and their depth attenuation

被引:43
作者
Ding, Shiming [1 ]
Xu, Di [1 ]
Bai, Xiuling [2 ]
Yao, Shuchun [1 ]
Fan, Chengxin [1 ]
Zhang, Chaosheng [3 ,4 ]
机构
[1] Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China
[2] Henan Univ, Coll Environm & Planning, Kaifeng 475000, Peoples R China
[3] Natl Univ Ireland Univ Coll Galway, Ryan Inst, GIS Ctr, Galway, Ireland
[4] Natl Univ Ireland Univ Coll Galway, Sch Geog & Archaeol, Galway, Ireland
关键词
organic phosphorus; sediment; half-life time; P-31; NMR; Lake Taihu; P-31; CHINA; PRECIPITATION; DEGRADATION; EXTRACTION; FORMS; WATER;
D O I
10.1016/S1001-0742(12)60137-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The understanding of organic phosphorus (P) dynamics in sediments requires information on their species at the molecular level, but such information in sediment profiles is scarce. A sediment profile was selected from a large eutrophic lake, Lake Taihu (China), and organic P species in the sediments were detected using solution phosphorus-31 nuclear magnetic resonance spectroscopy (P-31 NMR) following extraction of the sediments with a mixture of 0.25 mol/L NaOH and 50 mmol/L EDTA (NaOH-EDTA) solution. The results showed that P in the NaOH-EDTA extracts was mainly composed of orthophosphate, orthophosphate monoesters, phospholipids, DNA, and pyrophosphate. Concentrations of the major organic P compound groups and pyrophosphate showed a decreasing trend with the increase of depth. Their half-life times varied from 3 to 27 years, following the order of orthophosphate monoesters > phospholipids >= DNA > pyrophosphate. Principal component analysis revealed that the detected organic P species had binding phases similar to those of humic acid-associated organic P (NaOH-NRPHA), a labile organic P pool that tends to transform to recalcitrant organic P pools as the early diagenetic processes proceed. This demonstrated that the depth attenuation of the organic P species could be partly attributed to their increasing immobilization by the sediment solids, while their degradation rates should be significantly lower than what were suggested in previous studies.
引用
收藏
页码:925 / 932
页数:8
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