The condensed liquids drop into a graduated glass trap. Because water has a higher density than the solvent, it sinks to the bottom of the trap. The lighter solvent overflows back into the distillation flask.
Water Volume %=(Volume of Water in Trap (mL)Volume of Original Sample (mL))×100Water Volume % equals open paren the fraction with numerator Volume of Water in Trap (mL) and denominator Volume of Original Sample (mL) end-fraction close paren cross 100 Precision and Accuracy: Repeatability vs. Reproducibility
ASTM D95 is jointly sponsored by ASTM Committee D02 on Petroleum Products and Lubricants and the API Committee on Petroleum Measurement, ensuring its relevance across both standardization and industry practice. The standard also carries several parallel designations: Astm D95 Pdf
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The procedure involves distilling a sample with a water-immiscible solvent (like xylene or toluene). The condensed liquids drop into a graduated glass trap
The method utilizes co-distillation (often referred to as the Dean-Stark method). The sample is heated under reflux conditions with a water-immiscible solvent. As the solvent boils, it vaporizes and carries the water moisture from the sample along with it.
⚠️ These sources are not authorized distributors of ASTM standards. Their content may be incomplete, outdated, or corrupted, and using them for compliance or certification purposes is not recommended. Water Volume %=(Volume of Water in Trap (mL)Volume
As stated in the standard itself: "A knowledge of the water content of petroleum products is important in the refining, purchase, sale, and transfer of products." [28†L26-L28]
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