Development of a field preconcentration/elution unit for routine determination of dissolved metal concentrations by ICP-OES in marine waters : application for monitoring of the New Caledonia lagoon
| Autor: | Mathieu B.D. Dolbecq, Jean-Michel Fernandez, Benjamin Moreton |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Chelating resin
Elution Chemistry métaux dissous Mineralogy Geology préconcentration Matrix (chemical analysis) Metal eau de mer Geochemistry and Petrology visual_art Inductively coupled plasma atomic emission spectroscopy visual_art.visual_art_medium ICP-OES Seawater Routine analysis High flow Nuclear chemistry |
| Popis: | An iminodiacetate chelating resin was optimised for the rapid determination of Co, Cu, Fe, Mn and Ni in seawater. Using inexpensive, high-capacity, reusable cartridges allowed high flow rates of up to 25 ml min−1. High preconcentration factors, of up to 500, were obtained in order to analyse samples using an ICP-OES. The requirement for a buffer was eliminated due to the high tolerance of the ICP-OES to interfering matrix elements, thereby further reducing the potential for contamination. Quantification limits in seawater were: Co = 6 ng l−1, Cu = 8 ng l−1, Fe = 6 ng l−1, Mn = 5 ng l−1 and Ni = 6 ng l−1. The method was verified by the analysis of near shore seawater (CASS-4) and open ocean seawater (NASS-5) reference materials. In order to satisfy the high sampling demands using the iminodiacetate cartridges, a portable off-line preconcentration unit was developed for routine analysis. The multi-channel preconcentration unit, was capable of treating up to eight samples simultaneously with concentrating times as little as 30 minutes. The technique was also used to determine dissolved metals in fresh and interstitial waters. The technique has been successfully used in a number of environmental studies and impact assessments to evaluate the effects of mining on the New Caledonian lagoon. Pour l'analyse de Co, Cu, Fe, Mn et Ni dans l'eau de mer, la technique de preconcentration des metaux sur lit de resines chelatantes (Iminodiacetate) a ete retenue pour les capacites de retention que ces dernieres offrent. Conditionnees dans des colonnes reutilisables a faible cout, ces resines permettent des debits rapides de percolation jusqu'a 25 ml min−1. Les facteurs de preconcentration eleves qui ont ete obtenus (500) permettent d'analyser aisement les solutions d'elution par ICP-OES. Cette technique etant relativement peu sensible aux effets de matrice de l'analyte, l'emploi d'un tampon pH pour la percolation a eteecarte, reduisant ainsi les risques potentiels de contamination de l'echantillon. La methode a ete verifiee avec des echantillons standard d'eau de mer cotiere et hauturiere de references CASS-4 et NASS-5. Les limites de quantification en eau de mer sont les suivantes: Co = 6 ng l−1, Cu = 8 ng l−1, Fe = 6 ng l−1, Mn = 5 ng l−1 et Ni = 6 ng l−1. Pour repondre a une demande analytique importante avec cette methodologie, un banc de preconcentration off-line portable a ete concu pour le dosage en routine. Le banc se compose de 8 lignes de preconcentration des metaux pouvant traiter les echantillons simultanement en un peu plus de 30 minutes. La methodologie developpee peut etre indifferemment mise en œuvre pour les eaux douces comme pour les interstitielles des sediments. La technique a ete employee avec succes dans plusieurs programmes d'etudes environnementales et d'evaluations des impacts miniers dans le lagon de Nouvelle Caledonie. |
| Databáze: | OpenAIRE |
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