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Abstract
Mt. Pinatubo volcano in Luzon Island, the Philippines erupted violently in 1991 after being dormant for almost 460 years (Newhall 1991). For the rehabilitation planning of the areas covered with ash, a large number of ash samples was collected and analyzed. Low elemental-S content was estimated at an early stage of analysis because the pH(H2O) of the H2O2-treated samples did not change appreciably. There was an indication that sulfate-derived sulfide may possibly affect the growth of rice plants under submerged conditions. Information about the sulfate content was therefore essential. In this report several extraction methods of sulfate from fresh volcanic ash were evaluated.