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• W2292520453 abstract "Phytoextraction it's a promissing phytorremediation technique for heavy metal extraction from contaminated soils. As a recent technology, it needs necessary new ressearches to estabilish wich cultures may be employed in this technique. A pot experiment was conducted in a greenhouse to evaluate the extracting capacity of cadmium, cupper, lead, nickel and zinc by tobacco, Amazon pepper, sunflower and castor oil plant. The soil, a Red-Yellow Latosoil, collected at the superficial level (0 20 cm) received tree heavy metals rates as salts, proportinal to the mean levels found in a sewage sludge produced by the Barueri sewage sludge treatment plant. Rate 0: without metal addition, rate 1: with 0,75; 6,25; 20; 8,75 and 62,50 mg kg of Cd, Pb, Cu, Ni and Zn, rate 2: twice the ammount applyed in rate 1.The chelating agent EDTA was used (1 mmol kg soil) to evaluate it's effect in heavy metal availability to plants. The experiment was conducted in a randomized block design, with four replicates. Soil samples collected before plant estabilishment were digested by nitric acid with microwave heating. Plants were digested by nitric perchloric acid technique. Metals present in soil and plant extracts were determinated by the atomic emission spectrofotometry with plasma. EDTA and the highest heavy metal rates induced toxicity simptoms in plants, and decreased dry matter production. At the lowest heavy metal applyed rate, the most efficient plants which extracted metals in excess from the soil were tobacco without EDTA aplication for Cd, sunflower and tobacco with EDTA for Pb and Cu, sunflower with and without EDTA and tobacco without EDTA for Zn, and the castor oil plant with EDTA for Ni. At the highest applied rate, the most efficient plants to extract metals from the soil were tobacco without EDTA for Cd, Ni and Zn, and tobacco with EDTA for Cu and Pb. All plants studied could not be considered as heavy metal hiperaccumulator. EDTA aplication to increase metal uptake is not recommended, the used rate was toxic to the plants. It increased heavy metal concentration in plant tops, but decreased the dry matter production, resulting in less efficiency. Due to low soil contamination, and the high ammount of necessary plant cicles, phytoextraction of Cu, Ni and Pb at the applied amounts, was not economically worthless, and tobacco without EDTA application was the best recommended culture to extract excedent Cd and Zn from the soil." @default.
• W2292520453 created "2016-06-24" @default.
• W2292520453 creator A5019115432 @default.
• W2292520453 date "2003-01-01" @default.
• W2292520453 modified "2023-09-26" @default.
• W2292520453 title "EFICIÊNCIA DE ESPÉCIES VEGETAIS COMO FITOEXTRATORAS DE CÁDMIO, CHUMBO, COBRE, NÍQUEL E ZINCO DE UM LATOSSOLO VERMELHO AMARELO DISTRÓFICO" @default.
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• W2292520453 hasPublicationYear "2003" @default.
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