Origin of rainwater acidity near the Los Azufres geothermal field, Mexico

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• 作者：Verma ; Mahendra P. ; Quijano ; Jos&eacute ; Luis ; Johnson ; Craig ; Gerardo ; Jane Y. ; Arellano ; Victor
• 关键词：Rainwater ; Chemistry ; Isotope ; Sulfur-34 ; Alkalinity ; Los Azufres ; Mexico
• 刊名：Geothermics
• 出版年：2000
• 出版时间：August 1, 2000
• 年：2000
• 卷：29
• 期：4-5
• 页码：593-608
• 全文大小：331 K

文摘

The chemical and isotopic compositions of rainwater were monitored at Los Azufres geothermal field (88 MWe) and its surroundings during May – September 1995, which is the rainy season. Samples were collected from eight sites: three within the field, three in its surroundings and two sufficiently far from the field such that they have no geothermal input. The concentrations of Cl⁻, SO₄²⁻ and NO₃⁻ were measured in about 350 samples and found to be generally <5 ppm. Chloride concentrations remained constant with time, but sulfate and nitrate concentrations decreased, which suggests a nearby industrial source for the sulfate and nitrate. A mixing model for Cl⁻, SO₄²⁻ and δ³⁴S also suggests an industrial source for the rainwater sulfur.