摘要
以乌梁素海(WLSH)和岱海(DH)表层沉积物为吸附剂,开展了磷硅在2个湖泊沉积物上的释放实验研究,同时采用连续提取法探讨了释放后的磷硅形态变化。结果表明,磷和硅在2个湖泊沉积物上的释放行为均可用Elovich方程描述;0～20min为磷的快速释放阶段,此时段内约有75%的吸附磷迅速从沉积物上解吸并释放至上覆水中;0～2h为硅的快速释放阶段,此阶段内约有40%的吸附硅从沉积物上解吸并释放至上覆水中;总体上,沉积物中Ex-P、Al-P、Fe-P及IEF-Si、CF-Si具有较强的释放潜力。
Taking surface sediments from the Wuliangsuhai and Daihai Lake as adsorbent, the release experiments of phosphorus and silicate from sediments were carried out and the form distribution characters of phosphorus and silicate were studied after release using sequential extraction methods in this work. The results showed that the release characteristics of phosphorus and silicate can be expressed by the Elovich equation. In the first 20 min, there about 75% of adsorbed phosphorus were released into the overlying water with release rate of 183.495～188.791 mg·kg-1·h-1 or 4.287～4.424 mg·L-1·h-1; in the first 2 h, there about 40% of adsorbed silicate were released into the overlying water and the release capacity of the sediments form Lake Wuliangsuhai and Lake Daihai were 47.87 mg·L-1·h-1 and 11.88 mg·L-1·h-1 respectively. From the view of release capacity of different forms, the form of Ex-P had the maximum release capacity and its potential release risk should be paying more attention. Although the release rates of Al-P and Fe-P were not high, the percentage of average release capacity could be up to 60%～90%. Generally, the forms of Ex-P, Al-P, Fe-P, IEF-Si and CF-Si in the two lakes sediments had important potential bioavailability.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第11期2330-2335,共6页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(41003049
40863003)
内蒙古自然科学基金项目(2009BS0601
2010BS0601)
"国家大学生创新性实验计划"项目(20081012614)
关键词
释放特征
形态分布
磷
硅
沉积物
release behavior
form distribution
phosphorus
silicate
sediment
