An interlaboratory calibration of silica for geothermal water chemistry

Verma, Mahendra P.; Tello, Enrique; Sandoval, Fernando; Tovar, Rigoberto Torres; Martinez, Jose Luis

doi:10.1016/s0375-6505(02)00030-5

Cited by 10 publications

(2 citation statements)

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“…Determination of the amount of silica in water samples is presently of special concern in such applications as semiconductors, metallurgical products, industrial and puried waters. Different analytical techniques have been proposed so far to determine silicon, including spectrophotometry, [1][2][3][4][5] atomic absorption spectrometry (AAS), 6,7 inductively coupled plasma atomic emission spectrometry (ICP-OES), [8][9][10] and inductively coupled plasma mass spectrometry (ICP-MS), 11,12 ion chromatography (IC) [13][14][15][16] or capillary electrophoresis (CE). 17 But these analytical techniques are just involved in the determination of the total amount of silicon in water samples.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum blue photometry method for the determination of colloidal silica and soluble silica in leaching solution

Yang

Wei

et al. 2015

Anal. Methods

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An improved analytical procedure has been described for the spectrophotometric determination of colloidal silica in leaching solution by means of adding fluoride to convert colloidal silica into reactive silica. The method is a variation of the classical molybdenum blue method, and the optimal wavelength, temperature, ratio of H 3 BO 3 /NH 4 F, pH and ammonium molybdate in the colorimetric process has been determined. The pH especially needs to be fairly strictly controlled. The linear equation is established as: C ¼ 3.15956A À 0.51912, and R is more than 0.9992. Its feasibility and reproducibility have been confirmed by ICP-OES; the average relative error is 1.5%. The detection scope of silicon concentration extends almost 1000 times higher in a leaching solution, so the method in this paper can be used to detect leaching samples with a high silica concentration.

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Section: Introductionmentioning

confidence: 99%

Molybdenum blue photometry method for the determination of colloidal silica and soluble silica in leaching solution

Yang

Wei

et al. 2015

Anal. Methods

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“…, , , Verma et al . , , Urbino and Pang ), the chemical analysis of gas samples (Corazza , Mazor et al . , Giggenbach and Matsuo , Giggenbach et al .…”

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confidence: 99%

Determination of the Concentration of Carbonic Species in Natural Waters: Results from a World‐Wide Proficiency Test

Verma

Portugal

Gangloff

et al. 2014

Geostandard Geoanalytic Res

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The results of an international interlaboratory proficiency test for the determination of carbonic species are presented. Eight laboratories analysed twelve water samples (four synthetic waters, one lake water, four geothermal waters, one seawater and two petroleum waters) by two methods: (a) individual laboratory analytical procedure and (b) acid–base titration curves in tabular form following a standardised protocol. In case (b), the concentrations of carbonic species were calculated by the organiser using the (1) Hydrologists' method, (2) Geochemists' method and/or (3) initial pH and total alkalinity method. For synthetic waters, the averaged % trueness and precision of measurement of the two methods were (trueness = 7.6, precision = 9.4) and (9.0, 3.4) for total alkalinity, and (6.6, 31.0) and (7.8, 6.1) for carbonic alkalinity, respectively. This indicates that the total alkalinity calculation procedure is in general correct in the individual laboratory method, but the carbonic alkalinity calculation procedure has serious problems. The measurements of total alkalinity for lake and seawaters were in agreement in both the methods; however, the individual laboratory measurement method for geothermal and petroleum waters was conceptually incorrect. Thus, the analytical procedures for the determination of carbonic species were reviewed. To apply the Hydrologists' and/or Geochemists' methods, the location of NaHCO3EP and H2CO3EP is necessary, even for samples with pH lower than that of NaHCO3EP, and a backward titration curve after complete removal of CO2 must be performed. The initial pH and total alkalinity method is appropriate where a complete analysis of species that contribute to the alkalinity is known.

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Interlaboratory test for chemical analysis of geothermal fluids: A new approach to determine deep geothermal reservoir fluid composition with uncertainty propagation

Verma¹,

Izquiedo

Barth

et al. 2022

Applied Geochemistry

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An interlaboratory calibration of silica for geothermal water chemistry

Cited by 10 publications

References 1 publication

Molybdenum blue photometry method for the determination of colloidal silica and soluble silica in leaching solution

Molybdenum blue photometry method for the determination of colloidal silica and soluble silica in leaching solution

Determination of the Concentration of Carbonic Species in Natural Waters: Results from a World‐Wide Proficiency Test

Interlaboratory test for chemical analysis of geothermal fluids: A new approach to determine deep geothermal reservoir fluid composition with uncertainty propagation

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