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Extraction of Anions and Cations from Recent Volcanic Ash¹

ABSTRACT

Water extracts of ash from Mt. Arenal, Costa Rica's most recently active volcano, contained up to 32 ppm Ca, 3.3 ppm Mg, 4 ppm K, 4 ppm Na, and 0.4 ppm Mn. No phosphates were extracted by water, but sulfates reached 35 ppm and silicates 1.6 ppm in the extracts. The sample farthest away from the volcano gave extracts of lowest Ca and Mg content. The pH of diluted NaOH suspension of ash decreased on standing by up to 1.5 pH units.

¹ This work was carried out under the US Atomic Energy Commission Contract AT(30-1) 2043 at the Interamerican Inst. of Agr. Sci., Research & Training Center, Turrialba, Costa Rica.

² Senior Soil Chemist. Present address: Zona Andina—IICA, Apartado 11185, Lima, Perú.

Received for publication November 5, 1970. Accepted for publication November 16, 1970.