Evolution of water chemistry in natural acidic environments in Yangmingshan, Taiwan
Evolution of water chemistry in natural acidic environments in Yangmingshan, Taiwan
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DOI：
10.1039/b201499h
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发表时间：
2002-01-01
影响因子：
--
通讯作者：
Yoshimura, K
中科院分区：
文献类型：
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作者：
Ezoe, Y;Lin, CH;Yoshimura, K
位于台湾岛北部的阳明山国家公园，有一片非常罕见的酸性环境下仍能生存鱼类（Channa asiatica）的区域。在硫稳定同位素比和化学平衡的基础上讨论了当地酸池和河流中酸的起源以及水化学的演变。酸的来源之一是硫酸，它是由周围喷气孔喷出的火山气体中的硫化氢氧化以及台北市提供的酸沉积而产生的。它还源自黄铁矿的氧化：酸性池塘水（pH 3-4）中硫酸盐的δ（34）S硫稳定同位素比率为+1ppm至+4ppm（相对于CDT），可能与火山气体中的硫化氢、当地池塘沉积物和土壤中的黄铁矿以及雨水中的硫酸盐的硫稳定同位素比率有关。一种酸源是地热活动产生的硫酸和盐酸：δ(34)S 值的特征是千分之 13 至千分之 17 硫酸盐-S，这是由二氧化硫在深处的歧化反应提供的。另一种酸源可能是铁(II) 的氧化。在酸性条件下，水-岩反应产生高浓度的铝和铁。当沿着表面流流动时，铁（II）被氧化成铁（III），然后在有氧条件下水解以引起进一步酸化。铁和铝的浓度由氧化还原和溶解平衡控制。
In 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 around the area and from acid deposition supplied from Taipei City. It is also derived from the oxidation of pyrite: the sulfur stable isotope ratios of delta(34)S of +1parts per thousand to +4parts per thousand (relative to CDT) of sulfate in acid pond waters (pH 3-4) could be related to those of hydrogen sulfide in volcanic gas, pyrite in local pond sediments and soils, and sulfate in rain water. One acid source is sulfuric and hydrochloric acids arising in springs from geothermal activity: the delta(34)S values were characterised by +13parts per thousand to +17parts per thousand sulfate-S, which was provided by a disproportionation reaction of sulfur dioxide in the depths. Another acid source could be the oxidation of iron(II). Under acidic conditions, the water-rock reaction gives rise to high concentrations of aluminium and iron. While flowing down surface streams, iron( II) is oxidised to iron( III) and then hydrolysed to cause further acidification under oxic conditions. The concentrations of iron and aluminium are controlled by redox and dissolution equilibria.