厦门港表层沉积物对海水中铅的吸附动力学  

Kinetics of lead adsorption by Xiamen Harbour sediments

作　　者：陈松[1] 骆炳坤[1] 许爱玉[1] 廖文卓[1] 

机构地区：[1]国家海洋局第三海洋研究所,厦门361005

出　　处：《台湾海峡》1998年第4期364-369,共6页Journal of Oceanography In Taiwan Strait

基　　金：国家自然科学基金!48970277

摘　　要：模拟研究厦门港表层沉积物对海水中Ph的吸附动力学及水环境条件的影响，当海水温度由20～30℃、pH5～8和盐度30～4变化时，吸附速率分别提高约50％、1个数量级和5倍。吸附速率与盐度之间呈负指数相关关系。吸附过程可用交换吸附动力学模式描述。测定吸附速率常数、表观活化能和平衡吸附量等参数研究表明，沉积物对Pb的吸附性质以化学作用为主。The kinetics of Pb adsorption in seawater by suspensed sediments from Xiamen Harbouris simulated and the effects of seawater conditions are studied. It indicats that the adsorptionprocesses can be simulated by the exchange-adsorption kinetic model: t/x(t) = 1/K1C0Xm +t/x(eq), Adsorption rate constant, apparent activation energy and equilibrium adsorptive capacity have been quantitavely determined. The calculated x(eq) is quite close to that by measurement. The adsorption of Pb by sediments is essentally a chemical action.The influence of pH on adsorption is primarily on the rate and secondarily on the equilibrum. The adsorption rate decreases one order of magnitude and that of the adsorption fraction only 15%,as pH decreases from 8 to 5.The effect of salinity on adsorption is similar to that of pH. The adsorption rate increaseabout 5 times and adsorption fraction only 15% as salinlty decreases from 30 to 4. The quantitative relations between adsorption rate constant,adosrption fraction and salinity are preliminarily determined as:

关 键 词：吸附动力学 铅 沉积物 厦门港 海水 海洋污染 

分 类 号：X55[环境科学与工程—环境工程] P736.4[天文地球—海洋地质]