Tamagawa hyper-acidic hot spring and phreatic eruptions at Mt. Akita-Yakeyama: Part 1. The isotopic and chemical characteristics of the hot spring water

The world community has long used natural hot springs for tourist and medicinal purposes. In Indonesia, the province of West Java, which is naturally surrounded by volcanoes, is the main destination for hot spring tourism. This paper is the first report on radon measurements in tourism natural hot spring water in Indonesia as part of radiation protection for public health. The purpose of this paper is to study the contribution of radon doses from natural hot spring water and thereby facilitate radiation protection for public health. A total of 18 water samples were measured with an electrostatic collection type radon monitor (RAD7, Durridge Co., USA). The concentration of radon in natural hot spring water samples in the West Java region, Indonesia ranges from 0.26 to 31 Bq L−1. An estimate of the annual effective dose in the natural hot spring water area ranges from 0.51 to 0.71 mSv with a mean of 0.60 mSv for workers. Meanwhile, the annual effective dose for the public ranges from 0.10 to 0.14 mSv with an average of 0.12 mSv. This value is within the range of the average committed effective dose from inhalation and terrestrial radiation for the general public, 1.7 mSv annually.

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Electrochemical Detection of As(III) Ions in Hot Spring Water Based on a SiO2-Au Nanocomposite

International Journal of Electrochemical Science ◽

10.20964/2017.10.76 ◽

2017 ◽

pp. 8982-8990

Author(s):

Feng Sun ◽

Keyword(s):

Electrochemical Detection ◽

Hot Spring ◽

Spring Water ◽

Water Based

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Geochemical Modeling of Scale Formation due to Cooling and CO2-degassing in San Kamphaeng Geothermal Field, Northern Thailand

Chiang Mai University Journal of Natural Sciences ◽

10.12982/cmujns.2021.049 ◽

2021 ◽

Vol 20 (3) ◽

Author(s):

Sutthipong Taweelarp ◽

Supanut Suntikoon ◽

Thaned Rojsiraphisal ◽

Nattapol Ploymaklam ◽

Schradh Saenton

Keyword(s):

Carbon Dioxide ◽

Hot Springs ◽

Hot Spring ◽

Geochemical Modeling ◽

Chemical Properties ◽

Geothermal Field ◽

Spring Water ◽

Northern Thailand ◽

Scaling Potential ◽

Co2 Degassing

Scaling in a geothermal piping system can cause serious problems by reducing flow rates and energy efficiency. In this work, scaling potential of San Kamphaeng (SK) geothermal energy, Northern Thailand was assessed based on geochemical model simulation using physical and chemical properties of hot spring water. Water samples from surface seepage and groundwater wells, analyzed by ICP-OES and ion chromatograph methods for chemical constituents, were dominated by Ca-HCO3 facies having partial pressure of carbon dioxide of 10–2.67 to 10–1.75 atm which is higher than ambient atmospheric CO2 content. Surface seepage samples have lower temperature (60.9°C) than deep groundwater (83.1°C) and reservoir (127.1°C, based on silica geothermometry). Geochemical characteristics of the hot spring water indicated significant difference in chemical properties between surface seepage and deep, hot groundwater as a result of mineral precipitation along the flow paths and inside well casing. Scales were mainly composed of carbonates, silica, Fe-Mn oxides. Geochemical simulations based on multiple chemical reaction equilibria in PHREEQC were performed to confirm scale formation from cooling and CO2-degassing processes. Simulation results showed total cumulative scaling potential (maximum possible precipitation) from 267-m deep well was estimated as 582.2 mg/L, but only 50.4% of scaling potential actually took place at SK hot springs. In addition, maximum possible carbon dioxide outflux to atmosphere from degassing process in SK geothermal field, estimated from the degassing process, was 6,960 ton/year indicating a continuous source of greenhouse gas that may contribute to climate change. Keywords: Degassing, Geochemical modeling, PHREEQC, San Kamphaeng Hot Springs, Scaling

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Hydrochemical characteristics of the hot spring waters in the Kangding district related to the Lushan <i>M</i><sub>S</sub> 7.0 earthquake in Sichuan, China

Natural Hazards and Earth System Sciences Discussions ◽

10.5194/nhessd-2-7293-2014 ◽

2014 ◽

Vol 2 (12) ◽

pp. 7293-7308

Author(s):

Z. Chen ◽

X. Zhou ◽

J. Du ◽

C. Xie ◽

L. Liu ◽

...

Keyword(s):

Water Samples ◽

Carbonate Rocks ◽

Hot Springs ◽

Hot Spring ◽

Spring Water ◽

Lushan Earthquake ◽

Hydrochemical Characteristics ◽

Hydrochemical Data ◽

Deep Earth ◽

Precipitation Water

Abstract. Hydrogeochemistry of 10 hot springs in the Kangding district was investigated by analyzing cation and anion concentrations of the spring waters. The water samples were collected within 5 days after the Lushan earthquake. The spring waters are classified into 7 chemical types based on the hydrochemical compositions. Comparison with the hydrochemical data before the Lushan earthquake, concentrations of Ca2+, HCO3− and TDS of the waters from the Guanding, Erdaoqiao, Gonghe, Erhaoying, Tianwanhe and Caoke springs evidently increased, which resulted from enhancing interaction between deep-earth fluids and carbonate rocks by the increment of dissolved CO2 in the groundwater. Concentrations of Na+, Cl− and SO42− of the waters from the Guanding, zheduotang, Xinxing and Gonghe springs were decreased, indicating dilution of precipitation water. Concentrations of Na+ and SO42− of the Erhaoying spring water increased, which may be attributed to the more supplement of fluids enriched in sulfur. The results indicate that hydrochemical components of spring water can be used as an effective indicator for earthquakes.

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