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Rivista di Biologia Molecolare e Biotecnologie

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Minerva Biotecnologica 2001 June;13(2):103-9

lingua: Inglese

Chelate-assist­ed phy­toex­trac­tion of ­lead ­from ­soil. A ­study on ­some param­e­ters deter­min­ing the effi­cien­cy

Abruzzese A. 1, Rivetta A. 1, Lucchini G. 1, Gambale F. 2, Paganetto A. 2, Cocucci M. 1, Sacchi G. A. 1

1 Dipartimento di Produzione Vegetale, Università ­degli Studi, Milano;
2 Istituto di Cibernetica e Biofisica, Consiglio Nazionale ­delle Ricerche, Genova, Italy


Background. Soil pol­lu­tion ­with ­heavy met­als is one of the ­major prob­lems in indus­tri­al are­as. Chelate-assist­ed phy­toex­trac­tion has ­been pro­posed as an alter­na­tive to the ­high ­costs of the ex ­situ meth­o­dol­o­gy of decon­tam­i­na­tion ­based on ­soil remov­al and treat­ment. The ­soil of the ­present ­study has a low - medi­um lev­el of ­lead con­tam­i­na­tion (360 mg/kg dry ­soil) dis­trib­ut­ed by till­age ­works in the ­first 50 cm of ­soil. The aim of the ­present ­work was to ­study che­late ­agents capa­bil­ity to solu­bil­ise Pb in the ­soil and the che­late ­induced Pb accu­mu­la­tion in Helianthus ­annuus ­plant in ­order to optim­ise ­some ­aspects of a che­late-assist­ed phy­toex­trac­tion treat­ment.
Methods. Different doses of che­late ­agents, ethy­le­ne-di­am­inetetraacetic ­acid Dipotassium Salt, N-(2-hydrox­ye­thyl)eth­y­len­e­di­a­min­e­tri­a­cet­ic ­acid, Diethylenetriami-nepentaacetic ­acid, N,N’-DI(2-hydrox­y­ben­zil)eth­y­len­e­di­a­mine-N,N’-dia­cet­ic ­acid Monohydrocloride Hydrate, nitril­o­tri­a­cet­ic ­acid ­have ­been com­pared and the envi­ron­men­tal ­impact of the ­best per­form­ing che­late treat­ment has ­been con­sid­ered. For Pb sol­u­bil­isa­tion in ­soil the ­best per­form­ing che­late ­proved to be ­EDTA. The ­root absorp­tion and trans­lo­ca­tion to the ­xylem of the Pb-che­late com­plex­es ­were fol­lowed by the pres­sure cham­ber tech­nique.
Results. The Pb-­EDTA and Pb-NTA com­plex ­were the ­best ­absorbed. For the ­EDTA and Pb-­EDTA com­plex, the trans­pi­ra­tion ­stream con­cen­tra­tion fac­tor has ­been deter­mined. After ­EDTA treat­ment of the ­soil, the Pb ­absorbed in the ­plant was accu­mu­lat­ed in the ­leaves, a low ­amount was in the ­stem. The Pb mobil­ity in the ­soil ­after ­EDTA appli­ca­tion was test­ed show­ing the pos­sibil­ity of leach­ing ­toward ­deep ­layers and under­ground ­water. In addi­tion ­EDTA solu­bil­ised micro­nu­tri­ents ­with pos­sibil­ity of leach­ing and ­decrease in ­soil fer­til­ity.

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