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Comparison of Acid Neutralization by Chemical Weathering Between Acidified and Non-Acidified Watersheds

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Abstract

In eastern Asia, emission of acid materials and acid depositionwill increase with industrialization in future, and freshwatersin Japan are likely to become acidified. In this article, anevaluation method for acid-neutralization by chemical weatheringwas applied to one acidified watershed in U.S.A. and three non-acidified watersheds in Japan, and effect of hydrogeochemicalproperties on chemical weathering and stream water chemistry wasdiscussed. In three non-acidified watersheds in Japan, arealchemical weathering rates of primary minerals are much largerthan those observed in U.S.A. Watersheds in both countries showno difference in mineralogy, while the soil thickness (weatheredprofile) in watersheds is contrastive between acidified and non-acidified watersheds. Therefore, it is concluded that acidity is neutralized by chemical weathering of primary minerals in thick weathered profiles in Japanese watershed. In non-acidified Japanese watersheds which has the smallest acid-neutralization capacity in three observed watersheds, stream water will not acidify even if the acid deposition increases asmuch as two or three times the observed level. From the viewpoint of Japan's nationwide streamwater chemistry, more than 90% of the watersheds have far greater acid-neutralization capacities than this watershed, and will not be acidified even in cases where the acid deposition increase as much as two or three fold.

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Ikeda, H., Miyanaga, Y. Comparison of Acid Neutralization by Chemical Weathering Between Acidified and Non-Acidified Watersheds. Water, Air, & Soil Pollution 131, 407–436 (2001). https://doi.org/10.1023/A:1011980821249

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