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Conduziu-se este trabalho, com o objetivo de avaliar o potencial fitoextrator de arsênio (As) da Brachiaria decumbens Stapf., cultivada em casa de vegetação, utilizando-se seis solos: Latossolo Amarelo Distrófico (LAd), Latossolo Vermelho Distrófico (LVd), Neossolo Flúvico (RU), Neossolo Quartzarênico (RQ), Gleissolo Háplico (GX) e Gleissolo Melânico (GM). O As foi adicionado aos solos na forma de arsenato de sódio heptahidratado nas doses 0, 25, 50, 200 e 800 mg kg-1. As plantas foram coletadas 55 dias após a semeadura, separadas em parte aérea e raiz e, após secagem do material em estufa, o mesmo foi digerido segundo o método 3051 da USEPA, sendo o teor de As determinado por espectrofotometria de absorção atômica (EEA) com forno de grafite. Observou-se redução no desenvolvimento da braquiária de forma diferenciada nas seis classes de solo. Houve baixa translocação do As, da raiz para a parte aérea, sendo essa espécie considerada tolerante ao elemento e não hiperacumuladora, podendo ser utilizada em programas de revegetação de áreas contaminadas pelo elemento. This work evaluated the phytoextraction potential of arsenic (As) by Brachiaria decumbens growing under greenhouse conditions in six soils: a Dystrophic Yellow Latosol (LAd), a Dystrophic Red Latosol (LVd), a Fluvic Neosol (RU), a Quartzenic Neosol (RQ), a Haplic Gleysol (GX), and a Melanic Gleysol (GM). Arsenic was added to the soils as sodium arsenate heptahydrate (Na2HAsO4.7H2O) at the following doses: 0, 25, 50, 200, and 800 mg kg-1. The plants were collected 55 days after planting for determination of shoot and root dry matter production. Arsenic shoot and root contents were evaluated after digestion according to the USEPA 3051A method, following analysis by graphite furnace atomic absorption spectroscopy. Plant development was differently affected by As in the six different soil classes. There was low translocation of As and consequently most of the As was detected in the roots of Brachiaria decumbens. Therefore, this species could be considered tolerant but not an accumulator of arsenic, thus being indicated for revegetation programs in As-polluted soils and sediments

Fitorremediação de solos contaminados com arsênio (As) utilizando braquiária