Suppressed ion chromatography for monitoring chemical impurities in steam for geothermal power plants |
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Authors: | Santoyo E Verma S P Sandoval F Aparicio A García R |
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Institution: | Centro de Investigacíon en Energía (UNAM), Temixco, Mor., Mexico. esg@cie.unam.mx |
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Abstract: | A suppressed ion chromatography (IC) technique has been evaluated as a chemical monitoring tool for detecting major anions (F-, Cl-, NO3- and SO4(2-)) of condensed steam in geothermal power plants. It is shown that the suppressed IC technique provides a suitable means for preventing possible damage to generating equipment in the geothermal industry. An electrical conductivity detector (0.1 microS sensitivity) with an anion-exchange column (IonPac AS4A-SC), a micro-membrane suppressor (AMMS II), and an isocratic high-pressure pump system were successfully used for detecting low concentrations of inorganic anions. Method detection limits for the anions of interest were <0.184 mg/L. Details of the IC methodology as well as some experimental results obtained during its application for the chemical monitoring of geothermal steam pipes are also described. |
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