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- W2130809164 abstract "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.The determination of pH was found to be necessary, but is not sufficient to characterize rainwater acidity. The Gran titration method was used to determine alkalinity with respect to equivalence point of H2CO3∗. Values of alkalinity were found to range from 10−4 to 10−6 eq/L, and were negative only for some samples from Vivero and Guadalajara. Thus, SO42− and NO3− are in general not in acidic form (i.e. balanced by Na+, Ca2+, etc. rather than H+).Sulfate δ34S values were about −1.5‰ in Los Azufres and its surroundings, and in Morelia, but differed from the value of −0.2‰ for Guadalajara. The δ34S values for H2S from the Los Azufres geothermal wells are in the range −3.4 to 0.0‰. The δ34S ranges for the natural and anthropogenic sources for environmental sulfur overlap, making it difficult to differentiate between the contribution of different sources. However, a similarity of values of δ34S at Los Azufres and Morelia (85 km distant) suggest a regional source of sulfate that is not associated with geothermal emissions from Los Azufres." @default.
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- W2130809164 date "2000-08-01" @default.
- W2130809164 modified "2023-09-26" @default.
- W2130809164 title "Origin of rainwater acidity near the Los Azufres geothermal field, Mexico" @default.
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- W2130809164 doi "https://doi.org/10.1016/s0375-6505(00)00024-9" @default.
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