| Summary: | [EN] Most of the environmentally mobile constituents of volcanic ashes may be detected by one-stage batch leaching tests. Still, the lack of a standardized procedure makes it difficult to compare different studies. Batch tests were conducted using ashes of the Chaiten 2008 eruption (Chile) and an ancient (hundreds of thousands of years) eruption in the southern Puna (NW Argentina) to propose a batch test susceptible to harmonization for volcanic ash. The following factors were investigated: the amount of ash (0.1 and 1 g), leachant volume (1, 2, 5, 10, 25, and 50 ml of deionized water), and contact time (1.5, 4, and 16 h). The leachates were analyzed for about forty trace elements by ICP-OES and ICP-MS. The best batch leaching conditions tested correspond to 1 g of ash and 10 ml of deionized water shaking during 4 h. This methodology has been applied to recent and historical eruptions of the Southern Volcanic Zone of the Andes (Quizapu, 1932; Lonquimay, 1988; Hudson, 1991; Copahue, 2000; Llaima, 2008; Chaiten, 2008), the Central Volcanic Zone of the Andes (Quaternary ashes of different eruptions in southern Puna and neighboring areas in northwestern Argentina), and the recent eruption of Eyjafjallajokull (April-May 2010) in Iceland. This study was carried out in the framework of the PEGEFA Working Group (Catalonian Government 2009-SGR-972) and the Geochemistry and Petrology Group (Associated Unit CSIC-UB). It was funded by the Project ASH of the Spanish MICINN (CGL2008-00099) and the FPU Grant of the Spanish Ministry of Education of one of the authors (F. Ruggieri, Ref. AP2006-04592). This study was carried out in the framework of the PEGEFA Working Group (Catalonian Government 2009-SGR-972) and the Geochemistry and Petrology Group (Associated Unit CSIC-UB). It was funded by the Project ASH of the Spanish MICINN (CGL2008-00099) and the FPU Grant of the Spanish Ministry of Education of one of the authors (F. Ruggieri, Ref. AP2006-04592). Peer reviewed
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