长江口沉积物-铅的吸附动力学及环境影响  

Kinetics of lead adsorption and environment effects by Changjiang Estuary sediments

作　　者：陈松[1] 廖文卓[1] 许爱玉[1] 骆炳坤[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》1999年第2期125-130,共6页Journal of Oceanography In Taiwan Strait

基　　金：国家自然科学基金!(48970277号)

摘　　要：模拟研究不同水环境条件下长江口悬浮沉积物对 Ｐｂ的吸附动力 学，提供动力学模式，测定速率常数（ｋ_１）和分配系数（Ｋ_ｄ）。研究表明盐度和ｐＨ对吸 附产生明显影响，ｋ_１和Ｋ_ｄ分别与盐度存在着负指数关系；与ｐＨ存在线性关系。沉积 物－Ｐｂ的吸附以化学作用为主。The kinetics of Pb adsorption by suspended sediments from Changjiang Estuary was simulated and the effects of salinity and pH were studied. The adsorption processes can be simulated by the exchange adsorption kinetic model: t/x(t) = 1/k_1c_0x_m+t/x(eq). Adsorption rate constant (k1), equilibrium adsorption capacity [x(eq)] and distribution factor (K.) have been determined. The adsorption of Pb by sediments is essentially a chemical action. The salinity significantly influenced adsorption, specifically for rate. The effect is even more prominent at lower salinity of S<10. The relations between k_1,K_d,α and S have been preliminarily determined as: k_1=5.7exp[-0. 074S] K_d=6.5×10~4exp[-0. 064S] α(%)=-0. 98S + 91. 3 The pH also greatly influenced adsorption. The relations between k_1,K_d, and pH are as following: k_1=0. 23pH-0.94 K_d(×10~4)=0. 32pH-1.37

关 键 词：吸附动力学 铅 沉积物 长江口 吸附动力学 

分 类 号：P736.41[天文地球—海洋地质] P736.43[天文地球—海洋科学]