Evaluation of laboratory and industrial meat and bone meal combustion residue as cadmium immobilizing material for remediation of polluted aqueous solutions: "chemical and ecotoxicological studies".
Meat and Bone Meals (MBM) combustion residues (ashes) are calcium and phosphate-rich materials. The aim of this work is to evaluate ashes efficiency for remediation of cadmium-contaminated aqueous solutions, and to assess the bioavailability of cadmium on Xenopus laevis larvae. In this study both industrial (MBM-BA) and laboratory (MBM-LA) ashes are compared regarding their efficiency. Kinetic investigations reveal that cadmium ions are quickly immobilized, with a maximum cadmium uptake at 57 mg Cd(2+)/g of ashes for MBM-LA, two times higher than metal uptake quantity of MBM-BA, in our experimental conditions. Chemical and X-ray diffraction analysis (XRD) reveal that Cd(2+) is mainly immobilized as Ca(10-x)Cd(x)(PO(4))(6)(OH)(2) by both ashes, whereas otavite, Cd(CO(3)), is also involved for MBM-LA in cadmium uptake. Otavite formation could be explained by the presence of carbonates in MBM-LA, as observed by IR. Genotoxicity of cadmium solution on Xenopus larvae is observed at 0.02, 0.2 and 2mg Cd(2+)/L. However addition of only 0.1g/L MBM-LA inhibits these effects for the above concentration values whereas Cd(2+) bioaccumulation in larvae's liver is similar for both experiments, with and without ashes.
Coutand
M
M
Université de Toulouse; UPS, INSA; LMDC (Laboratoire Matériaux et Durabilité des Constructions); 135, avenue de Rangueil; F-31 077 Toulouse Cedex 04, France. marie.coutand@iut-tlse3.fr
Deydier
E
E
Cyr
M
M
Mouchet
F
F
Gauthier
L
L
Guilet
R
R
Savaete
L Bernues
LB
Cren
S
S
Clastres
P
P
D000818:Animals; D001688:Biological Products; D002104:Cadmium / Q000302:isolation & purification*; D002606:Charcoal; D054750:Ecotoxicology; D052918:Environmental Restoration and Remediation; D017745:Incineration; D007814:Larva; D008460:Meat; D008903:Minerals; D009152:Mutagenicity Tests; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods; D014982:Xenopus laevis
D001688:Biological Products; D008903:Minerals; D014873:Water Pollutants; D002104:Cadmium; D002606:Charcoal; C027762:bone meal