Accumulation of heavy metals in sunflower and sorghum plants affected by the Guadiamar spill

被引:97
作者
Murillo, JM [1 ]
Marañón, T [1 ]
Cabrera, F [1 ]
López, R [1 ]
机构
[1] CSIC, IRNAS, E-41080 Seville, Spain
关键词
Guadiamar river; heavy metals; pyrite tailings; sorghum; sunflower; toxicity levels;
D O I
10.1016/S0048-9697(99)00396-4
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The collapse of a pyrite-mining, tailing dam on 25 April 1998 contaminated approximately 2000 ha of croplands along the Agrio and Guadiamar river valleys in southern Spain. This paper reports the accumulation of chemical elements in soil and in two crops - sunflower and sorghum - affected by the spill. Total concentrations of As, Bi, Cd, Cu, Mn, Pb, Sb, Tl and Zn in spill-affected soils were greater than in adjacent, unaffected soils. Leaves of spill-affected crop plants had higher nutrient (K, Ca and Mg for sunflower and N and K for sorghum) concentrations than controls, indicating a 'fertilising' effect caused by the sludge. Seeds of spill-affected sunflower plants did accumulate more As, Cd, Cu and Zn than controls, but values were below toxic levels. Leaves of sorghum plants accumulated more As, Bi, Cd, Mn, Pb, Tl and Zn than controls, but these values were also below toxic levels for livestock consumption. In general, none of the heavy metals studied in both crops reached either phytotoxic or toxic levels for humans or livestock. Nevertheless, a continuous monitoring of heavy metal accumulation in soil and plants must be established in the spill-affected area. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:281 / 292
页数:12
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