Malherbe J.,Laboratoire Of Chimie Analytique Bio Inorganique Et Environnement |
Malherbe J.,U.S. National Institute of Standards and Technology |
Isaure M.-P.,Laboratoire Of Chimie Analytique Bio Inorganique Et Environnement |
Seby F.,Ultra Traces Analyses Aquitaine UT2A |
And 9 more authors.
Environmental Science and Technology | Year: 2011
Hexavalent chromium (Cr(VI)) occurrence in soils is generally determined using an extraction step to transfer it to the liquid phase where it is more easily detected and quantified. In this work, the performance of the most common extraction procedure (EPA Method 3060A) using NaOH-Na2CO3 solutions is evaluated using X-ray absorption near edge structure spectroscopy (XANES), which enables the quantification of Cr(VI) directly in the solid state. Results obtained with both methods were compared for three solid samples with different matrices: a soil containing chromite ore processing residue (COPR), a loamy soil, and a paint sludge. Results showed that Cr(VI) contents determined by the two methods differ significantly, and that the EPA Method 3060A procedure underestimated the Cr(VI) content in all studied samples. The underestimation is particularly pronounced for COPR. Low extraction yield for EPA Method 3060A was found to be the main reason. The Cr(VI) present in COPR was found to be more concentrated in magnetic phases. This work provides new XANES analyses of SRM 2701 and its extraction residues for the purpose of benchmarking EPA 3060A performance. © 2011 American Chemical Society.
Mehyou Z.,CNRS Analytical Sciences Lab |
Lobinski R.,Laboratoire Of Chimie Analytique Bio Inorganique Et Environnement |
Hagege A.,CNRS Analytical Sciences Lab
Talanta | Year: 2011
A simple protocol to obtain Cu(II)-IDA (iminodiacetic acid)-modified capillaries was developed for immobilized metal ion affinity chromatography (IMAC). It consisted in the synthesis of IDA-silane used for a one-step coating of fused silica capillaries. The approach prevented the hydrolysis of silica potentially induced by two step coatings (γ-GPTMS, then IDA) employed in the conventional method of bonding iminodiacetic acid. The IDA content was quantified using a model relating the electroosmotic flow generated in IDA-modified capillaries to the charges induced by IDA species. The retention behavior of holotransferrin and bovine serum albumin on these IMAC columns was then investigated. Holotransferrin revealed a high affinity for Cu(II)-supports through a specific interaction with Cu(II) ions whereas albumin did not show any retention. The use of such columns for sample pretreatment before an HPLC analysis was proved to be successful. © 2011 Elsevier B.V. All rights reserved.
Aoun M.,Lebanese Atomic Energy Commission |
Aoun M.,Laboratoire Of Chimie Analytique Bio Inorganique Et Environnement |
Arnaudguilhem C.,Laboratoire Of Chimie Analytique Bio Inorganique Et Environnement |
El Samad O.,Lebanese Atomic Energy Commission |
And 2 more authors.
Environmental Science and Pollution Research | Year: 2015
Due to their toxicity, persistence, and bioaccumulation, metals are important marine environment pollutants, especially in low renewal rate water such as the Mediterranean Sea, receiving a lot of untreated industrial waste. The impact of a phosphate fertilizer plant on the marine biota metal contamination was studied. Several types of organisms: crabs, mussels, patella and fish were collected from two areas of the Lebanese coast, one subjected to the impact of the plant and another away from it; samples were analyzed for Zn, U, Cr, V, Mn, Ni, Co, Cu, As, Cd and Pb by ICP-MS. Higher accumulation was in crabs, patella, and mussels. Fish accumulated principally Zn, Cu, and Cd; a difference was observed between species and tissues. Cytosol metal fractionation using size-exclusion LC-ICP-MS showed principally Pb, As, Co, and Mn in the low molecular weight fraction (<1.8 Da); Cd, Zn, and Cu in the metallothionein fraction (1.8–-18 k Da), and Ni in high molecular weight fraction (>20 kDa). © 2015 Springer-Verlag Berlin Heidelberg