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中国太湖不同营养水平区域沉积物的磷形态及pH值对磷释放的影响

Phosphorus fractions and the effect of pH on the phosphorus release of the sediments from different trophic areas in Taihu Lake, China.

作者信息

Jin Xiangcan, Wang Shengrui, Pang Yan, Chang Wu Feng

机构信息

Research Center of Lake Environment, Chinese Research Academy of Environment Sciences, 100012 Beijing, China.

出版信息

Environ Pollut. 2006 Jan;139(2):288-95. doi: 10.1016/j.envpol.2005.05.010. Epub 2005 Aug 2.

Abstract

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.

摘要

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。

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