Heavy metal mobility assessment in sediments based on a kinetic approach of the EDTA extraction:: search for optimal experimental conditions

被引:92
作者
Fangueiro, D
Bermond, A
Santos, E
Carapuça, H
Duarte, A
机构
[1] Inst Natl Agron Paris Grignon, Chim Analyt Lab, F-75005 Paris 05, France
[2] Univ Aveiro, Dept Quim, P-3810193 Aveiro, Portugal
关键词
EDTA; heavy metals; kinetic extraction; speciation; introduction;
D O I
10.1016/S0003-2670(02)00134-4
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The feasibility of kinetic extraction studies using EDTA as the complexing agent is evaluated for the extraction of Cd2+, Cu2+, Pb2+ and Fe3+ from contaminated sediments. In the first approach, the study was carried out in batch equilibrium conditions in order to determine optimal ranges for operational parameters, such as pH, concentration of EDTA and the ratio of mass of sediment to volume of EDTA, m/V. It has been concluded that the quantities of metal extracted by EDTA do not depend on the m/V ratio and that an EDTA concentration of 0.05 M ensures an excess of extractant. The kinetic studies were performed with the optimised experimental conditions. Two extraction protocols were used and compared in terms of experimental performance. The main difference between these two protocols is the use, in protocol I of a single sediment/EDTA mixture in which aliquots are collected at different times, whereas in protocol II several mixtures are stirred, each one for a different time. It has been shown that results of EDTA extractions can be influenced by the protocol used and we recommend protocol H for kinetic studies. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:245 / 256
页数:12
相关论文
共 23 条
[1]  
[Anonymous], TOXICOL ENV CHEM
[2]   Kinetic approach to the chemical speciation of trace metals in soils [J].
Bermond, A ;
Yousfi, I ;
Ghestem, JP .
ANALYST, 1998, 123 (05) :785-789
[3]   Effect of complexing agents (EDTA and ATMP) on the remobilization of heavy metals from a polluted river sediment [J].
Bordas, F ;
Bourg, ACM .
AQUATIC GEOCHEMISTRY, 1998, 4 (02) :201-214
[4]  
Bourg A. C. M., 1994, TRANSPORT REACTIVE P, P79
[5]   SEDIMENT PORE-WATER COLLECTION METHODS FOR TRACE-METAL ANALYSIS - A REVIEW [J].
BUFFLAP, SE ;
ALLEN, HE .
WATER RESEARCH, 1995, 29 (01) :165-177
[6]   Desorption of cadmium from goethite (alpha-FeOOH) [J].
Davis, AP ;
Upadhyaya, M .
WATER RESEARCH, 1996, 30 (08) :1894-1904
[7]  
GHESTEM JP, 1997, THESIS I NATL AGRONO
[8]   ACCURACY OF SELECTIVE EXTRACTION PROCEDURES FOR METAL SPECIATION IN MODEL AQUATIC SEDIMENTS [J].
KHEBOIAN, C ;
BAUER, CF .
ANALYTICAL CHEMISTRY, 1987, 59 (10) :1417-1423
[9]  
LANGMICHAUT C, 1990, PRATIQUE TESTS STAT, P88
[10]   Extractability of zinc, cadmium, and nickel in soils amended with EDTA [J].
Li, ZB ;
Shuman, LM .
SOIL SCIENCE, 1996, 161 (04) :226-232