Jin Xiangcan, Wang Shengrui, Pang Yan, Chang Wu Feng
Research Center of Lake Environment, Chinese Research Academy of Environment Sciences, 100012 Beijing, China.
Environ Pollut. 2006 Jan;139(2):288-95. doi: 10.1016/j.envpol.2005.05.010. Epub 2005 Aug 2.
The sediment characteristics, different phosphorus (P) fraction concentrations and the effect of pH on P release were investigated in a shallow eutrophic lake in China. The total phosphorus (TP) concentrations in the sediments ranged greatly from 420 to 3408 mg kg(-1) and inorganic P (IP) was the main P fraction. For the heavily eutrophic sediment, IP mainly consisted of NaOH-P; while for the mesotrophic sediments, IP mainly consisted of HCl-P. The rate of P release decreased as pH increased from 2 to 6. But it increased as pH increased from 8 to 12. It is suggested that high pH promoted the release of NaOH-P, and low pH promoted the release of HCl-P, and there was no P release occurring in the neutral condition.
在中国一个浅水富营养化湖泊中,对沉积物特征、不同磷(P)形态浓度以及pH值对磷释放的影响进行了研究。沉积物中的总磷(TP)浓度范围很大,从420到3408毫克/千克(-1),无机磷(IP)是主要的磷形态。对于重度富营养化沉积物,IP主要由NaOH-P组成;而对于中营养沉积物,IP主要由HCl-P组成。当pH值从2增加到6时,磷释放速率降低。但当pH值从8增加到12时,磷释放速率增加。结果表明,高pH值促进了NaOH-P的释放,低pH值促进了HCl-P的释放,在中性条件下没有磷释放发生。