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Chelate-Assisted Phytoremediation of Cu-Pyrene-Contaminated Soil Using Z. mays

Author:
Chigbo, Chibuike, Batty, Lesley
Source:
Water, air, and soil pollution 2015 v.226 no.3 pp. 2277
ISSN:
0049-6979
Subject:
EDTA (chelating agent), Zea mays, chelates, citric acid, copper, phytoremediation, plant growth, polluted soils, soil amendments
Abstract:
This study compares the efficiency of a synthetic chelate (ethylenediaminetetraacetic acid-EDTA), a natural low-molecular-weight organic acid (citric acid), and their combination for phytoremediation of Cu-pyrene co-contaminated soils. Zea mays was grown in each soil and amended with citric acid and/or EDTA to understand the effect of chelates during phytoremediation of contaminated soils. In Cu or pyrene-contaminated soil, plant growth was negatively affected by EDTA (43 %) and citric acid (44 %), respectively, while EDTA + citric acid promoted (41 %) plant growth in co-contaminated soil. EDTA and EDTA + citric acid increased the phytoextraction of Cu in Cu-contaminated and co-contaminated soils, respectively. In pyrene-contaminated soil, all tested chelates increased the dissipation of pyrene reaching 90.4 % for citric acid, while in co-contaminated soil, only citric acid or EDTA + citric acid enhanced pyrene dissipation. These results show that Z. mays can be effective with the help of chelates in phytoextraction of Cu and dissipation of pyrene in co-contaminated soil.
Agid:
1214034