FACT CHECK #LB5BGI2D

WHAT WE FOUND

The claim refers to the water extraction method, a standard field test used to measure the ethanol content in gasoline by mixing a fuel sample with water and observing the resulting phase separation 10. Using distilled water at room temperature is a recognized practice in ethanol assay protocols to ensure consistency 9. While this method is considered a reasonable estimate for verifying approximately 10% ethanol content (E10 fuel), it is not as precise as professional laboratory techniques 4 6. High-credibility sources indicate that manual field tests are subject to human error and lack the accuracy of gas chromatography or Karl Fischer titration 1 3 5. Furthermore, a 4% volume contraction occurs when water and ethanol are mixed, which can slightly distort readings if not mathematically corrected 6 8.

SOURCES

1. 1 · pmc.ncbi.nlm.nih.govACADEMIC
   A simple capacitive method to evaluate ethanol fuel samples - PMC

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2. 2 · nature.comACADEMIC
   A simple capacitive method to evaluate ethanol fuel samples | Scientific Reports

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3. 3 · digital.wpi.eduACADEMIC
   EVALUATION OF ETHANOL MEASURING TECHNIQUES A Major Qualifying Project Report

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4. 4 · en.wikipedia.orgWEB
   Common ethanol fuel mixtures - Wikipedia

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5. 5 · store.astm.orgWEB
   D7923 Standard Test Method for Water in Ethanol and Hydrocarbon Blends by Karl Fischer Titration

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6. 6 · continuouswave.comWEB
   Classic Whaler: Boston Whaler: Reference: Fuel Systems: Ethanol Test

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7. 7 · stonylab.comWEB
   How to Purify Ethanol: Step-by-Step Distillation Guide for High Purity – StonyLab

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8. 8 · homedistiller.orgWEB
   Proofing a spirit accurately without using a hydrometer - Home Distiller

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9. 9 · prod-docs.megazyme.comWEB
   ETHANOL ASSAY PROCEDURE K-ETOH 05/21 AOAC Method 2019.08

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10. 10 · waldeneffect.orgWEB
    How to measure the ethanol content of gasoline

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