Heavy metals and arsenic uptake by wild vegetation in the Guadiamar river area after the toxic spill of the Aznalcóllar mine.
On 25 April 1998, approximately 4.5 hm(3) of pyritic sludge, containing 5000 mg of As kg(-1) among other pollutants, was spilled into the Agrio and Guadiamar rivers and the surrounding agricultural areas (Aznalcóllar, Seville, Southern Spain). Many trace metals such as Pb, Cu, Zn, Cd, Tl, Sb and As reached the Doñana National Park, the largest wetland area in Europe, affecting soils, different plant and animal species. In order to recuperate the affected lands by employing plants capable of accumulating high levels of contaminants in shoots, periodical field surveys have been made to identify the metal-tolerant species that are spontaneously growing in the polluted soils, and are able to uptake one or various of the contaminants. Among the 99 different plant species studied, Anchusa azurea, Beta vulgaris, Chamaemelum fuscatum, Convolvulus arvensis, Cynodon dactylon, Diplotaxis virgata, Erodium aethiopicum, Lavatera cretica, Malva nicaeensis, Silybum marianum and, above all, Amaranthus blitoides highlight as the most promising to be used in the remediation of the affected area.
Del Río
Mercedes
M
Instituto de Agricultura Sostenible (IAS-CSIC), Alameda del Obispo s/n, E-14080, Córdoba, Spain.
Font
Rafael
R
Almela
Concepción
C
Vélez
Dinoraz
D
Montoro
Rosa
R
De Haro Bailón
Antonio
A
D000062:Accidents, Occupational; D001151:Arsenic / Q000032:analysis* / Q000378:metabolism; D019216:Metals, Heavy / Q000032:analysis* / Q000378:metabolism; D008906:Mining; D010944:Plants / Q000378:metabolism*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism; D013030:Spain; D013045:Species Specificity; D014877:Water Pollution, Chemical
D019216:Metals, Heavy; D012989:Soil Pollutants; D001151:Arsenic