太湖水域PH3的时空变化特征

以太湖为研究对象 ,考察了富营养化浅水湖泊中磷化氢的时空分布特征 .结果表明 ,湖面大气中PH3 由于受风向、天气等因素的综合作用 ,时空分布规律不太明显 .表层湖水和底层湖水由于受到风浪扰动 ,天气变化和船只等的影响 ,不同采样点PH3 的含量变化不大 .同时 ,PH3 浓度沿湖水垂直梯度方向的变化亦较小 .而过滤湖水与原始湖水中PH3 的时空变化在同一采样点位、同一采样时间 ,原始湖水中PH3 的浓度明显高于过滤湖水中PH3 的浓度 .底泥中PH3 含量的变化可能与湖底氧化还原环境和温度有关 ,对于水体污染比较严重的地方底泥PH3 含量较高 .

Temporal and spatial distributions of phosphine in Taihu Lake

Phosphine levels in Taihu Lake were investigated, which is a typical shallow eutrophical lake. Results indicated that there was little variation of the phosphine concentrations in atmosphere above Taihu Lake in the 2002. Concentrations of phosphine were affected by wind and weather conditions. Similarly, in surface lake water and bottom lake water, the concentrations of phosphine in different sampling time and sites did were quite stable. Results indicated also that the concentrations of phosphine in lake water were much higher than filtrated lake water when compared in the same sampling site and time. Phosphine levels in lake sediments were different. This could be explained by the oxidation and deoxidation conditions and the temperature variations in lake sediments. Levels of phosphine were higher in severely polluted sites.