Geochemical effects on colloid-facilitated metal transport through zeolitized tuffs from the Nevada Test Site

被引:44
作者
Um, W [1 ]
Papelis, C [1 ]
机构
[1] Desert Res Inst, Div Hydrol Sci, Las Vegas, NV 89119 USA
来源
ENVIRONMENTAL GEOLOGY | 2002年 / 43卷 / 1-2期
关键词
colloids; Pb(II); sorption; colloid-facilitated transport; zeolitized tuffs; Nevada Test Site (NTS); Nevada; USA;
D O I
10.1007/s00254-002-0646-4
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Natural colloids were generated from zeolitized tuffs from the Nevada Test Site (NTS) and the effects of colloids on the transport of a strongly sorbing metal, lead [Pb(II)], were investigated in column experiments under different geochemical conditions. Because of the high sorption affinity of Pb(II) for zeolitized tuffs, the migration of Pb(II) without colloids was strongly retarded. The presence of mobile colloids, however, enhanced the mobility of Pb(II). Approximately 75-90% of the eluted Pb(II) was transported as a colloid-associated phase. The migration of colloids was closely related to the geochemical conditions in the background solution. Immobilization of colloids increased as the ionic strength of the background electrolyte solution increased, because of double layer compaction. Remobilization of initially deposited colloids occurred when the ionic strength of the background electrolyte solution was reduced. The mobility of colloids increased with increasing pH and increasing flow rates. These results have significant implications for the migration of strongly sorbing radionuclides and other metals at nuclear testing facilities and metal-contaminated sites and are consistent with the hypothesis that inorganic contaminant migration in the subsurface is a function of geochemical conditions.
引用
收藏
页码:209 / 218
页数:10
相关论文
共 36 条
[1]  
[Anonymous], J CONT HYDR, DOI DOI 10.1016/0169-7722(87)90011-8
[2]   Surface complexation of Pb(II) at oxide-water interfaces .1. XAFS and bond-valence determination of mononuclear and polynuclear Pb(II) sorption products on aluminum oxides [J].
Bargar, JR ;
Brown, GE ;
Parks, GA .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1997, 61 (13) :2617-2637
[3]   COLLOID FORMATION DURING WASTE FORM REACTION - IMPLICATIONS FOR NUCLEAR WASTE-DISPOSAL [J].
BATES, JK ;
BRADLEY, JP ;
TEETSOV, A ;
BRADLEY, CR ;
TENBRINK, MB .
SCIENCE, 1992, 256 (5057) :649-651
[4]  
BERNOT PA, 1999, THESIS U NEVADA LAS
[5]   Adsorption of gases in multimolecular layers [J].
Brunauer, S ;
Emmett, PH ;
Teller, E .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1938, 60 :309-319
[6]  
BRYANT EA, 1991, LA12014MS LOS AL NAT
[7]  
Buddemeier RW., 1988, Appl Geochem, V3, P535, DOI DOI 10.1016/0883-2927(88)90025-X
[8]   FIXATION AND REMOBILIZATION OF TRACE CONTAMINANTS IN SIMULATED SUBSURFACE AQUIFERS [J].
CHAMPLIN, JBF ;
EICHHOLZ, GG .
HEALTH PHYSICS, 1976, 30 (02) :215-219
[9]  
CHANG R, 1988, CHEMISTRY
[10]   SPECTROSCOPIC INVESTIGATION OF PB(II) COMPLEXES AT THE GAMMA-AL2O3 WATER INTERFACE [J].
CHISHOLMBRAUSE, CJ ;
HAYES, KF ;
ROE, AL ;
BROWN, GE ;
PARKS, GA ;
LECKIE, JO .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1990, 54 (07) :1897-1909