Cadmium Uptake by Lettuce (Lactuca sativa L.) as Basis for Derivation of Risk Limits in Soils

Autor(es)

Azevedo Melo, Leonidas Carrijo ^[1] ; Ferracciu Alleoni, Luis Reynaldo ^[1] ; Swartjes, Frank Albert ^[2] ; da Silva, Evandro Barbosa ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Soil Sci, ESALQ, BR-13418900 Piracicaba, SP - Brazil

^[2] Natl Inst Publ Hlth & Environm, NL-3720 BA Bilthoven - Netherlands

• Tipo de documento: Artigo Científico
• Fonte: HUMAN AND ECOLOGICAL RISK ASSESSMENT; v. 18, n. 4, p. 888-901, 2012.
• Citações Web of Science: 6

Resumo

The availability and uptake of Cd by lettuce (Lactuca sativa L.) in two common tropical soils (before and after liming) were studied in order to derive human health-based risk soil concentration. Cadmium concentrations ranging from 1 to 12 mg kg(-1) were added to samples from a clayey Oxisol and a sandy-loam Ultisol under glasshouse conditions. After incubation, a soil sample was taken from each pot, the concentration of Cd in the soil was determined, lettuce was grown during 36 d, and the edible parts were harvested and analyzed for Cd. A positive linear correlation was observed between total soil Cd and the Cd concentration in lettuce. The amount of Cd absorbed by lettuce grown in the Ultisol was about twice the amount absorbed in the Oxisol. Liming increased the soil pH and slightly reduced Cd availability and uptake. CaCl2 extraction was better than DTPA to reflect differences in binding strength of Cd between limed and unlimed soils. Risk Cd concentrations in the Ultisol were lower than in the Oxisol, reflecting the greater degree of uptake from the Ultisol. The derived risk Cd values were dependent on soil type and the exposure scenario. (AU)

• Processo FAPESP: 07/56350-9 - Fitotoxicidade de cádmio e bário e derivação dos valores de alerta e intervenção para solos paulistas
• Beneficiário: Leônidas Carrijo Azevedo Melo
• Modalidade de apoio: Bolsas no Brasil - Doutorado