Estimation of pHe of Denatured Ethanol Fuel with a pH Meter as per ASTM D6423

pHe is a significant parameter for decreasing the risk of failing motors. It indicates the acid strength of ethanol and alcohol fuels. Determination of pHe of a denatured blend of ethanol utilizing a 913 pH meter as per ASTM D6423 is explained in this application note.


Denatured ethanol fuel

Sample Preparation

No sample preparation is necessary, if necessary cool or heat it to 22 °C ± 2 °C using a thermostat.


. .
913 pH Meter, laboratory version 2.913.0210
tiBase 1.1 6.6063.112
EtOH-Trode, inner and bridge electrolyte c(KCl) = 3 mol/L 6.0269.100
Temperature sensor Pt1000 6.1110.100
External magnetic stirring plate (e.g. IKA color squid white) IKA 0003671000

Analysis of Samples

A 60 mL sample is measured and taken in a 100 mL beaker. After being placed on an external stirring plate, electrodes are immersed, and estimation is started immediately. The reading on pH meter after 30 seconds is deemed to be the acid strength of sample.


. .
pHe (n=10) s rel (%)
8.08 0.45

About Metrohm

At Metrohm is one of the world’s most trusted manufacturers of high-precision instruments for chemical analysis. Metrohm was founded in 1943 by engineer Bertold Suhner in Herisau, Switzerland. Today, Metrohm is represented in 120 countries by subsidiaries and exclusive distributors. The global Metrohm Group also includes the Dutch companies Metrohm Applikon and Metrohm Autolab, manufacturers of online analyzers and instruments for electrochemical research, respectively. Recently, the Metrohm Group was joined by Metrohm Raman, a leading manufacturer of handheld Raman spectrometers.

Metrohm is the global market leader in analytical instruments for titration. Instruments for ion chromatography, voltammetry, conductivity, and stability measurement make the Metrohm portfolio for ion analysis complete. Instruments for Near-infrared and Raman spectroscopy are another, strongly growing segment of the Metrohm portfolio.

Metrohm is a problem solver, both in the laboratory and within the industrial process. To this end, the company offers their customers complete solutions, including dedicated analytical instrumentation as well as comprehensive application know-how. More than 30% of the company’s employees at the Metrohm international headquarters in Herisau work in R&D.

Metrohm has been owned 100% by the non-profit Metrohm Foundation since 1982. The Metrohm Foundation, which does not exert any influence on the company’s business operations, sponsors gifted students in the natural sciences, supports charitable and philanthropic purposes and, above all, ensures the independence of the company.

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Last updated: May 15, 2020 at 11:34 AM


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