离子交换法测定稀土元素与巩县风化煤黄腐酸的络合物的稳定常数  

USE OF THE ION EXCHANGE METHOD FOR THE DETERMINATION OF STABILITY CONSTANTS OF RARE EARTH WITH FULVIC ACID

作　　者：高焕新[1] 栾新福 辛文达[1] 陶祖贻[1] 陆长青[2] 

机构地区：[1]兰州大学现代物理系,730000 [2]中科院南京土壤研究所,210008

出　　处：《核化学与放射化学》1993年第3期139-143,共5页Journal of Nuclear and Radiochemistry

基　　金：中科院南京土壤研究所土壤圈物质循环开放研究实验室资助;核工业总公司资助

摘　　要：用放射性示踪原子和Schubert的离子交换平衡法,测定了一种国内广泛研究和应用的河南巩县风化煤黄腐酸与4种稀土元素的络合物的稳定常数。用放射性示踪原子^(160)Tb和改进的Ar-dakani-Stevenson的离子交换平衡法,测定了该黄腐酸与Tb的络合物稳定常数。The stability constants of complexes of Eu,Gd,Tb,Yb with fulvic acid from weathered coal are determined using Schubert's ion exchange method and radioactive tracers. The range of stability constants is 108 - 1014,and the 1:1 and 1 : 2 binding sites complexes are the predominant species.Calculation methods based on Ardakani-Stevenson's ion exchange equilibrium method are developed for determining stability constants of metal with humic and fulvic acids. The methods are verified using Tb(Ⅲ)-fulvic acid from weathered coal. The stability constants range from 1011.93 - 1011.15 at pH 4. 7 and ionic strength 0. 1mol/kg.

关 键 词：黄腐酸 稀土元素 络合物 稳定常数 

分 类 号：O614.33[理学—无机化学]