摘要
利用自制的氧化铁 /醋酸纤维素复合膜 (FeO/CAM )发展了一种沉积物和土壤磷的生物有效性评估的新方法 .结果表明 :从沉积物和土壤中解吸的生物有效磷 (FeO P)含量随时间增加而增加 ,至 16～ 2 0h左右 ,解吸过程接近平衡 ;随着土 /水比增大而减小 ,至 2 0～ 30g/L左右逐渐趋于平缓 ,且相对标准偏差较小 ;膜面积为 2 0～ 30cm2 时FeO P含量差别较小 ,且相对标准偏差也较小 ;适当提高振荡频率 (一般 2 0 0r/min左右 ) ,有利于促进FeO P的提取动力学过程 .在用于评估水体沉积物和土壤解吸磷的生物有效性方面 ,FeO/CAM膜克服了氧化铁浸渍滤纸的缺点 ,易于商品化 ,具有更好的应用前景 .
A new method to assess phosphorus bioavailability in the sediments and soils was developed by using a homemade iron oxide/cellulose acetate membrane(FeO/CAM). The results show that the amount of bioavailable phosphorus(FeO-P) desorbed from the sediment and soil increased with the shaking time,and FeO-P desorption would come to equilibrium after 16 ot 20h. With the increase of the ratio between soil mass and water volume,the quantity of the desorbed FeO-P would decrease and then went planar after 20 to 30g/L. The quantity of the desorbed FeO-P had no significant difference between the FeO/CAMs of 20 to 30cm2. The dynamics of FeO-P desorption from the sediments and soils would be accelerated by appropriately increasing the shaking frequency. In short,FeO/CAMs overcome many disadvantages of iron oxide impregnated filter paper and are easy to be commercialized; therefore it may have a better future in the application to assessing phosphorus hioavailability in the sediments and soils.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2005年第2期206-208,共3页
Environmental Science
基金
中国科学院知识创新工程重大项目 (KZCX1 SW 12 Ⅱ 3 2 )
国家高技术研究发展计划(863 )项目(2 0 0 2AA60 10 11 0 3 0 2 )
关键词
氧化铁/醋酸纤维素膜
氧化铁浸渍滤纸
土壤
沉积物
生物有效磷
解吸
iron oxide/cellulose acetate membrane
iron oxideimpregnated paper
soil
sediment
bioavailable phosphorus
desorption
