pH与三峡库区底泥氮磷释放关系的试验

通过对三峡库区底泥总氮、总磷(TN、TP)释放特性进行研究，分析了pH对三峡库区底泥TN、TP释放的影响及其原因，结果表明水溶液的pH在3．98～11．05范围内，TN、TP在3d内最大释放量达到最大值，pH在l1．05～11．94范围内，TN在3d内最大释放量达到最大值，而TP在ld内最大释放量就达到最大值；pH越低TN的最大释放量越大，pH在3．98～10．07范围内，TP的最大释放量基本相同，pH在10．07～11．94范围内，TP的最大释放量急剧增加。说明了三峡库区底泥TN、TP对库区水质存在的危险性，并为三峡库区富营养化治理从控制氮磷营养盐含量方面提供了参考。

Relationship Between pH Value of the Water and Release Silt Bottom of Nitrogen & Phosphate in the Three Gorges

By experimental study of release characteristics bottom silt of total nitrogen (TN) & total phosphate (TP) in the Three Gorges, the influence and cause of pH value to Three Gorges bottom silt TN & TP release are analyzed. pH values is between 3.98 to 11.05 the release capacity of TN & TP reaches maximal in 3 days and pH values is between 11.05 to 11.94 the release capacity of TN reaches maximal in the 3 days. While pH value between 11.05 to 11.94, the release capacity of TP reaches maximal in 1 days; If pH value is lowered, the maximal release capacity of TN is enhanced: The maximal release capacity of TP basically has no changes on the condition of pH values between 3.98 and 10.07, but its maximal release capacity rises extremely obvious if pH value is between 10.07 to 11.05. At the same time, the existence of latent danger of the Three Gorges bottom silt TN & TP to water quality is explained, and the basis of eutrophication treatment in the aspects control of N & P nutrients for theThree Gorges is supplied.