evolution of water chemistry in natural acidic environments in yangmingshan, yangmingshan national park, located in the northern part of the taiwan island, there is a very rare area where fish (channa asiatica) live in spite of acid environments. the origin of the acid in local acid ponds and rivers and the evolution of the water chemistry are discussed on the basis of sulfur stable isotope ratios and chemical equilibria. one of the sources of the acid is sulfuric acid, which is derived from the oxidation of hydrogen sulfide in volcanic gas gushing out from fumaroles ...200212195996
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