Abstract：Influence of sediment capping on phosphorus speciations using 800℃-heated natural calcium-rich attapulgite were researched, sequential chemical extraction and 31P nuclear magnetic resonance (31P NMR) were used to analyze the changes of phosphorus speciations during sediment capping period, and mechanism of phosphorus forms transformation were analyzed by Scanning Electron Microscope (SEM-EDS). The results indicated that active phosphorus content was reduced from 308.6mg/kg to 241.1mg/kg, and calcium phosphorus content was increased from 204.9mg/kg to 257.3mg/kg. Results from 31P NMR analysis showed that DNA-P, pyrophosphate and single lipid content were decreased by 47.0%, 36.8% and 31.3%, respectively. Results of SEM-EDS analysis indicated that the white flocculent deposits on the surface of sediment were mainly calcium phosphate. The above analysis preliminary showed that mechanisms of phosphorus forms transformation were due to the high content of active calcium in the material and the changes of surface sediment environment after sediment capping, which promoted phosphorus speciations transformed from active phosphorus to calcium phosphorus.
孔明, 尹洪斌, 晁建颖, 张毅敏. 凹凸棒黏土覆盖对沉积物磷赋存形态的影响[J]. 中国环境科学, 2015, 35(7): 2192-2199.
KONG Ming, YIN Hong-Bin, CHAO Jian-Ying, ZHANG Yi-Min. Influence of attapulgite clay capping on phosphorus forms in the sediment. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(7): 2192-2199.
