研究论文
张斌亮,张昱,杨敏,黄清辉,刘敏.长江中下游平原三个湖泊表层沉积物对磷的吸附特征[J].环境科学学报,2004,24(4):595-600
长江中下游平原三个湖泊表层沉积物对磷的吸附特征
- Characteristics of phosphorus sorption on surface sediments in three shallow lakes in the Yangtze River Basin
- 基金项目：中科院知识创新重大项目(编号:KZCX1-SW-12-Ⅱ-01)
- 作者
- 单位
- 张斌亮
- 1. 中科院生态环境研究中心,环境水质学国家重点实验室,北京 100085; 2. 华东师范大学地理系,教育部城市环境动态过程开放实验室,上海 200062
- 张昱
- 中科院生态环境研究中心,环境水质学国家重点实验室,北京 100085
- 杨敏
- 中科院生态环境研究中心,环境水质学国家重点实验室,北京 100085
- 黄清辉
- 中科院生态环境研究中心,环境水质学国家重点实验室,北京 100085
- 刘敏
- 华东师范大学地理系,教育部城市环境动态过程开放实验室,上海 200062
- 摘要：以长江中下游太湖、巢湖和龙感湖等3个湖泊表层沉积物(0～1cm)为对象,研究了不同沉积物对湖水中磷的吸附特性,并探讨了沉积物表面特性和化学组分等因素对磷的吸附行为的影响.结果表明:表层沉积物对磷的吸附作用主要发生在快吸附过程的前1～2h之内;湖泊表层沉积物对磷的吸附基本符合修正后的Langmuir型等温方程,不同采样点的表层沉积物中本底磷吸附量(QNAP)以及磷饱和吸附量(Qmax)差别显著,与采样点所处环境条件有很大关系.同时,沉积物的饱和吸附量与比表面积、活性铁、铝含量和有机质含量有较好的正相关性,相关系数分别为0.92,0.98,0.78和0.96;活性铁、铝含量与有机质含量之间也有较好的正相关性;颗粒物Zeta电位在一定程度上影响沉积物对磷的吸附能力.
- Abstract：Phosphorus sorption (P sorption) on surface sediments in three shallow lakes in Yangtze River Basin was studied. The results indicated that P sorption mainly occurred within 2 h during the fast sorption process. P sorption on the sediments could be well fitted to the Langmuir isotherm equation modified with the native adsorbed phosphorus (NAP). The P sorption capacity and NAP varied from different sediment samples, depending on the site-specific environmental conditions. And the P sorption capacities were closely related to the specific surface area,the contents of iron/aluminum (oxy) hydroxides and organic matter. The correlation coefficients of on thes components were 0.92, 0.98, 0.78 and 0.92, respectively. The contents of iron/aluminum (oxy) hydroxides were also closely correlated with the contents of organic matter. P sorption was slightly affected by Zeta potential of sediments.
- Key words：phosphorus sorption surface sediment lakes
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