Predicting metal uptake and risk to the human food chain from leaf vegetables grown on soils amended by long-term application of sewage sludge

被引:60
作者
Datta, SP [1 ]
Young, SD [1 ]
机构
[1] Univ Nottingham, Sch Biosci, Nottingham NG7 2RD, England
关键词
biotic ligand model; free ion activity model; metal solubility; metal uptake; risk assessment; soil solution; speciation; spinach;
D O I
10.1007/s11270-005-0006-6
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The success of risk assessment of metal contaminated soils depends on how precisely one can predict the bio-availability of metals in soil and transfer to the human food chain. In the present investigation, we tested several formulations of the 'free-ion activity model (FIAM)' to predict uptake of Cd, Zn and Cu by perpetual spinach (Beta vulgaris, Cicla) grown on a range of soils amended with sewage sludge. The model was parameterised using data measured on samples of pore water extracted by centrifugation and with porous Rhizon samplers installed within the rhizosphere of the growing plants. Free ion activities (M2+) were estimated following speciation of solution data using version 6 of the 'Windermere Humic Aqueous Model (WHAM-VI). For all three metals, the best formulation of the FIAM appeared to require only one hypothetical root sorption site without competition from protons. Values of (M2+) could also be predicted satisfactorily from a pH-dependent Freundlich relation. Thus, from a combined FIAM-Freundlich relation and population dietary information, it was possible to estimate risk (hazard quotients) to consumers from very simple soil measurements: extractable metal content (0.05 M EDTA (Zn and Cu) or 1 M CaCl2 (Cd)), soil humus content and pH. The role of increased soil organic matter content and soil pH, in reducing risk to consumers, is illustrated for Cd in a hypothetical soil at the current UK statutory Cd limit for sludge application to agricultural land.
引用
收藏
页码:119 / 136
页数:18
相关论文
共 44 条
[1]   Arsenic and heavy metal contamination of vegetables grown in Samta village, Bangladesh [J].
Alam, MGM ;
Snow, ET ;
Tanaka, A .
SCIENCE OF THE TOTAL ENVIRONMENT, 2003, 308 (1-3) :83-96
[2]  
[Anonymous], 1982, WHO FOOD ADD SER, V683
[3]  
BAES CF, 1984, REV ANAL PARAMETERS
[4]   Evaluation of the free ion activity model of metal-organism interaction: extension of the conceptual model [J].
Brown, PL ;
Markich, SJ .
AQUATIC TOXICOLOGY, 2000, 51 (02) :177-194
[5]   Determination of acute Zn toxicity in pore water from soils previously treated with sewage sludge using bioluminescence assays [J].
Chaudri, AM ;
Knight, BP ;
Barbosa-Jefferson, VL ;
Preston, S ;
Paton, GI ;
Killham, K ;
Coad, N ;
Nicholson, FA ;
Chambers, BJ ;
McGrath, SP .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1999, 33 (11) :1880-1885
[6]   Determination of metal-EDTA complexes in soil solution and plant xylem by ion chromatography-electrospray mass spectrometry [J].
Collins, RN ;
Onisko, BC ;
McLaughlin, MJ ;
Merrington, G .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2001, 35 (12) :2589-2593
[7]  
DIBONITO M, 2002, P 17 WORLD C SOIL SC, V24, P1
[8]  
*EUR COUNC DIR, 1986, EUR COMM COUNC DIR 1, P6
[9]  
Hassan N., 2000, INTRA FAMILIAR DISTR
[10]  
Hooda PS, 1997, J SCI FOOD AGR, V73, P446, DOI [10.1002/(SICI)1097-0010(199704)73:4&lt