Arsenic fractionation in agricultural acid soils from NW Spain using a sequential extraction procedure.
Arsenic fractionation has been studied in nine vineyard soils from a wine-producing area in Galicia (NW Spain) characterized by an unusually high As content. Total As concentrations are 7 to 10 times higher the maximum values allowed by the legislation, reaching maximum value of 200 mg kg(-1). The study of As fractionation revealed that those fractions showing strong correlations to crystalline Fe and Al hydrous oxides (r>0.69, p<0.01 and r>0.71, p<0.01 respectively) represented, on average, higher than the 80% of total As. The low levels of mobile and potentially toxic As fractions (<4% of total As) suggest that its toxicity is partially minimized in these soils, although the modifications induced by soil management could promote an increase of As availability.
Nóvoa-Muñoz
Juan Carlos
JC
Area de Edafoloxía e Química Agrícola, Facultade de Ciencias de Ourense, Universidade de Vigo. As Lagoas s/n. 32004 Ourense, Spain. edjuanca@uvigo.es
Queijeiro
José Manuel G
JM
Blanco-Ward
Daniel
D
Alvarez-Olleros
Cristalina
C
García-Rodeja
Eduardo
E
Martínez-Cortizas
Antonio
A
D000383:Agriculture; D000535:Aluminum / Q000737:chemistry; D001151:Arsenic / Q000032:analysis* / Q000737:chemistry; D005591:Chemical Fractionation; D004784:Environmental Monitoring; D007501:Iron / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D013030:Spain; D027843:Vitis
D012989:Soil Pollutants; D000535:Aluminum; D007501:Iron; D001151:Arsenic