Assessment of Two New Ligands for Increasing the Uptake of Cd, Cr, and Ni in Helianthus annuus Grown in a Sandy-Loam Soil

摘要

The use of two new ligands, (1Z)-1-(4-aminophenyl) ethan-1-one semicarbazone (L~1) and (1Z)-1-(4-nitrophenyl)ethan-1-one semicarbazone (L~2), was evaluated for their potential use as chelators in increasing phytoremediation effectiveness. The uptake of heavy metals by Teddy Bear sunflowers increased when L~1 added at 0.1 and 0.3 g/kg. Metal uptake selectivity was Cr > Ni ? Cd for each treatment. The 0.1-g/kg L~1 ligands produced a significant uptake of metals in Sundance sunflowers. The 0.3-g/kg L~1 level increased the metal uptake, but it was lower than 0.1-g/kg L~1 treatment. The uptake selectivity with L~2 ligand was Cr > Ni > Cd, with the majority of metals retained in the roots. L~1 ligand was better compared in comparison to L~2 ligand for enhancing uptake of metals.