We report a measurement procedure to determine simultaneously the major cation concentrations (Na, Ca, K and Mg) of seawater-derived solutions by inductively coupled plasma-atomic emission spectrometry. The best results were obtained when the IAPSO ('standard') seawater reference material was diluted by thirty times with Milli-Q â water. We obtained an average reference value r K (the ratio of the mass fraction of potassium to that of chlorine, i.e., (g kg -1 )/(g kg -1 )) for IAPSO seawater of 0.0205 ± 0.0006 (2.9% RSD), not significantly different from 0.0206 ± 0.0005 (2.4% RSD) for seawater composition reported in the literature. The measured Na, Ca and Mg concentrations correspond to r Na , r Ca and r Mg values of 0.5406 ± 0.0026 (0.5% RSD), 0.02192 ± 0.00048 (2.2% RSD) and 0.06830 ± 0.00047 (0.7% RSD), respectively, in line with previous values measured by wet-chemistry and atomic absorption spectrophotometry or wet-chemical titration. Our measurement procedure was used successfully on synthetic seawater solutions and high-temperature hydrothermal fluids.Keywords: ICP-AES, IAPSO, reference material, major elements, seawater, hydrothermal fluids.Nous proposons une m ethode d'analyse par spectrom etrie d' emission coupl ee a un plasma induit pour mesurer simultan ement les concentrations en cation (Sodium, Calcium, Potassium et Magn esium) de solution d'eau de mer. Les meilleurs r esultats ont et e obtenus lorsque la solution de r ef erence d'eau de mer IAPSO etait dilu ee trente fois avec de l'eau Milli-Q â . Pour la solution de r ef erence IAPSO, nous obtenons une valeur moyenne pour r k (le rapport de la fraction massique de potassium sur celle de chlore, c. a.d. (g kg -1 )/(g kg -1 )) egale a 0.0205 ± 0.0006 (2.9% RSD). Cette valeur est similaire a 0.0205 ± 0.0005 (2.4% RSD) de la composition de l'eau de mer mentionn ee dans la litt erature. Les concentrations mesur ees pour le Na, Ca et Mg correspondent a un r Na de 0.5406 ± 0.0026 (0.5% RSD), un r Ca de 0.02192 ± 0.00048 (2.2% RSD) et un r Mg de 0.06830 ± 0.00047 (0.7% RSD). Ces valeurs sont en ad equation avec celles mesur ees au pr ealable par chimie humide et spectrophotom etrie d'absorption atomique ou par titrage chimique par voie humide. Nous avons utilis e notre m ethode d'analyse pour d eterminer la composition chimique d'eau de mer synth etique et de fluides hydrothermaux de haute temp erature.Mots-clés : ICP-AES, IAPSO, mat eriaux de r ef erence, el ements principaux, eau de mer, fluides hydrothermaux.
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