TY - JOUR
T1 - Effects of chemical competition for multi-metal binding by Medicago sativa (alfalfa)
AU - Gardea-Torresdey, J. L.
AU - Tiemann, K. J.
AU - Gamez, G.
AU - Dokken, K.
N1 - Funding Information:
The authors acknowledge the financial support from the National Institutes of Health (NIH) (grant # GM 08012-25) and the financial support from the University of Texas at El Paso's Center for Environmental Resource Management (CERM) through funding from the HBCU/OMI Environmental Technology Consortium which is funded by the Department of Energy and the Office of Exploratory Research of the US Environmental Protection Agency (cooperative agreement CR-819849-01-4).
PY - 1999/9/1
Y1 - 1999/9/1
N2 - Alfalfa shoot biomass has demonstrated the ability to bind an appreciable amount of cadmium(II), chromium(III), copper(II), lead(II), nickel(II), and zinc(II) separately from aqueous solutions. Since most heavy metal contaminated waters contain more than one heavy metal ion, it was necessary to determine the binding abilities of the alfalfa biomass with multi-metal solutions. Batch laboratory experiments were performed with a solution containing 0.1 mM of each of the following metal ions: cadmium(II), chromium(III), copper(II), lead(II), nickel(II), and zinc(II). We determined the pH profile, time dependency, and binding capacity by the alfalfa biomass of each metal ion under multi-elemental conditions. For all the metal ions studied, the alfalfa biomass showed to have a high affinity for metal binding around pH 5.0 within a time period of approximately 5 min. The binding capacity experiments showed that there was a preferential binding of the metal ions from the multi-elemental solution with the following amounts of metal ion bound per gram of biomass: 368.5 μmol/g for copper(II), 215.4 μmol/g for chromium(III), 168.0 μmol/g for lead(II), 56.9 μmol/g for zinc(II), 49.2 μmol/g for nickel(II), and 40.3 μmol/g for cadmium(II). Reacting the biomass from the capacity experiments with 0.1 M HCl resulted in 90% or greater recovery of bound cadmium, copper, lead, nickel, and zinc. However, only 44% of the bound chromium was recovered. These experiments show the ability of Medicago sativa (alfalfa) to bind several metal ions under multi-contaminant conditions. Similar results were obtained when the experiments were performed under flow conditions using silica-immobilized alfalfa biomass. Chromium bound on the silica-immobilized biomass was also difficult to be desorbed with 0.1 M HCl. The information obtained will be useful for the future development of an innovative technology to remove heavy metal contaminants from polluted ground waters. Copyright (C) 1999 Elsevier Science B.V.
AB - Alfalfa shoot biomass has demonstrated the ability to bind an appreciable amount of cadmium(II), chromium(III), copper(II), lead(II), nickel(II), and zinc(II) separately from aqueous solutions. Since most heavy metal contaminated waters contain more than one heavy metal ion, it was necessary to determine the binding abilities of the alfalfa biomass with multi-metal solutions. Batch laboratory experiments were performed with a solution containing 0.1 mM of each of the following metal ions: cadmium(II), chromium(III), copper(II), lead(II), nickel(II), and zinc(II). We determined the pH profile, time dependency, and binding capacity by the alfalfa biomass of each metal ion under multi-elemental conditions. For all the metal ions studied, the alfalfa biomass showed to have a high affinity for metal binding around pH 5.0 within a time period of approximately 5 min. The binding capacity experiments showed that there was a preferential binding of the metal ions from the multi-elemental solution with the following amounts of metal ion bound per gram of biomass: 368.5 μmol/g for copper(II), 215.4 μmol/g for chromium(III), 168.0 μmol/g for lead(II), 56.9 μmol/g for zinc(II), 49.2 μmol/g for nickel(II), and 40.3 μmol/g for cadmium(II). Reacting the biomass from the capacity experiments with 0.1 M HCl resulted in 90% or greater recovery of bound cadmium, copper, lead, nickel, and zinc. However, only 44% of the bound chromium was recovered. These experiments show the ability of Medicago sativa (alfalfa) to bind several metal ions under multi-contaminant conditions. Similar results were obtained when the experiments were performed under flow conditions using silica-immobilized alfalfa biomass. Chromium bound on the silica-immobilized biomass was also difficult to be desorbed with 0.1 M HCl. The information obtained will be useful for the future development of an innovative technology to remove heavy metal contaminants from polluted ground waters. Copyright (C) 1999 Elsevier Science B.V.
KW - Alfalfa
KW - Heavy metal binding
KW - Mix metal solutions
KW - Multi-element
KW - Phytofiltration
UR - http://www.scopus.com/inward/record.url?scp=0032821825&partnerID=8YFLogxK
U2 - 10.1016/S0304-3894(99)00057-6
DO - 10.1016/S0304-3894(99)00057-6
M3 - Article
C2 - 10502605
AN - SCOPUS:0032821825
SN - 0304-3894
VL - 69
SP - 41
EP - 51
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1
ER -