Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/15769
Authors: Verma, Mahendra P* 
Izquiedo, Georgina* 
Barth, Johannes A C* 
Rayes-Delgado, Lisette* 
Chandrasekhar, Trupti* 
Algabre, Julienne Eve* 
Caballero, Marianne Antonette C* 
Godoy, Jose Marcus* 
Sanchez, Mayela* 
Brusca, Lorenzo* 
Malimo, Sylvia* 
Monvoisin, Gael* 
Kretzschmar, Thomas* 
Villanueva Estrada, Ruth Esther* 
Armienta, Maria Aurora* 
De Silva, Nimal* 
Title: Interlaboratory test for chemical analysis of geothermal fluids: A new approach to determine deep geothermal reservoir fluid composition with uncertainty propagation
Journal: Applied Geochemistry 
Series/Report no.: /147 (2022)
Publisher: Elsevier
Issue Date: 2022
DOI: 10.1016/j.apgeochem.2022.105477
Keywords: Geothermal water
Inter-laboratory test
Geothermal system
Los Azufres
Geochemical modeling
Uncertainty propagation
NIST Uncertainty machine
Subject Classification05.04. Instrumentation and techniques of general interest 
Abstract: A representative fluid sampling of surface geothermal manifestations and its analytical data quality assurance and quality control (QA/QC) are challenging aspects of understanding the geothermal reservoir processes. To achieve these goals, an interlaboratory test for the chemical analyses of ten water samples: one synthetic water, two lake waters (i.e., duplicated), one stream water, and six water samples from two geothermal wells of Los Azufres Geothermal field (LAGF), Michoacan, Mexico, was conducted. The geothermal wells were sampled at four points: (1) total discharge of condensed fluid at the wellhead, (2) separate liquid condensed in the well separator, (3) flushed liquid at the weir box, and (4) separated vapor condensed at the well-separator (data taken from Verma et al., 2022). Sixteen laboratories from ten countries reported their results. The pH, electrical conductivity, Ca2+, Li+, SO4 2 B, and Si-total measurements were 8.35 ± 0.04, 12.25 ± 0.53 mS/cm, 25 ± 1 mg/l, 18 ± 1 mg/l, 569 ± 33 mg/l, 320 ± 21 mg/l, and 20.5 ± 0.7 mg/l, which are close to the conventional true values, 8.40, 12.31 mS/cm, 23 mg/l, 19 mg/l, 647 mg/l, 330 mg/l, and 20.0 mg/l, respectively. Analytical errors for major ions, Na+, Cl
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