Utilization of the Mucuna aterrima plants in phytoremediation of soil contaminated by lead = Utiliza o da mucuna preta (Mucuna aterrima Piper & Tracy) para a fitorremedia o de solo contaminado por chumbo

The work was to evaluate the accumulation of Pb in plant tissue of velvet bean (Mucuna aterrima Piper & Tracy.) in contaminated soil for this element and investigate the potential for soil remediation. Plants were grown in pots with a capacity of 9 dm3 of soil. The treatments were in addition to the vessels: 18.8, 37.5, 75, 150, 300, 600 and 1200 mg kg-1 in the form of Pb (Pb (NO3)2). The treatments were distributed according to statistical design DIC with three replications. Samples of soil and plant tissue were collected ninety days after sowing for the quantification of mass of dry matter of shoots and roots for the determination of Pb accumulation. The results obtained were subjected to analysis of variance and regression. The plants showed greater accumulation of Pb in shoots, depending on the weight of dry matter produced; with the gradual increase in Pb concentrations in soil there was no decrease of the dry weight of roots and shoots. = O trabalho foi desenvolvido com o objetivo de avaliar o acúmulo de chumbo (Pb) no tecido vegetal de mucuna preta (Mucuna aterrima Piper & Tracy.) em solo contaminado por este elemento e verificar o potencial de fitorremedia o desta planta. As plantas foram cultivadas em vasos com capacidade para 9 dm3 de solo. Os tratamentos consistiram de níveis crescentes de Pb nos recipientes: 18,8; 37,5; 75; 150; 300; 600 e 1.200 mg kg-1 de Pb na forma de (Pb(NO3)2). Os tratamentos foram distribuídos no delineamento inteiramente casualizado com três repeti es. Amostras do solo e do tecido vegetal foram coletadas noventa dias após a semeadura para a quantifica o das massas das matérias secas da parte aérea e das raízes para a determina o do acúmulo de chumbo. Os dados obtidos foram submetidos à análise de variancia e regress o. As plantas demucuna preta apresentaram maior acúmulo de Pb em sua parte aérea, em fun o da massa de matéria seca produzida; n o houve altera o significativa na produ o da massa de matéria seca das raízes e da parte aérea em fun o das doses de Pb no solo.