Astm - D95 Pdf
[ \textWater (vol %) = \frac\textVolume of water (mL)\textMass of sample (g) \times 100 ]
(Assumes water density = 1 g/mL – for crude oils, acceptable.)
If you just need the test method without buying the standard:
Free training materials: Many universities post lab manuals using ASTM D95 – search "ASTM D95 distillation method" filetype:pdf (educational, not full standard).
[ \textWater content (vol%) = \fracV_wV_s \times 100 ] Astm D95 Pdf
A: No. It measures free water and emulsified water. Dissolved water (below the saturation point) is not detected. For that, use Karl Fischer titration.
The sample is heated under reflux in a water-insoluble solvent (typically xylene or toluene). Water distilled from the sample condenses and collects in a graduated receiving tube (Dean & Stark trap). The volume of water is directly read at room temperature.
ASTM D95 – Standard Test Method for Water in Petroleum Products and Bituminous Materials by Distillation
The method operates on the principle of azeotropic distillation. [ \textWater (vol %) = \frac\textVolume of water
Many petroleum products have boiling points significantly higher than water. However, simply boiling the sample may not efficiently separate the water, especially if the sample is viscous or tends to emulsify. ASTM D95 utilizes a water-immiscible solvent (typically a petroleum distillate like xylene, toluene, or a petroleum naphtha) that has a lower boiling point than water.
When the sample and solvent are heated, the solvent vaporizes and mixes with the water vapor. Because the solvent is immiscible with water, they form a heterogeneous azeotrope. This mixture distills over and condenses. Upon condensation, the solvent and water separate into two distinct layers due to their immiscibility. The water, being denser, settles to the bottom of a graduated trap, while the lighter solvent overflows back into the distillation flask. This process continues until all water is removed from the sample.
ASTM D95 is a proprietary standard published by ASTM International. For the exact procedural steps, precision data, and official wording, consult the latest ASTM D95 standard document available from ASTM International.
Related search suggestions (You may use these terms in a search to find the ASTM text, complementary methods, or application notes.) If you just need the test method without
I will now provide related search term suggestions.
Title: Standard Test Method for Water in Petroleum Products and Bituminous Materials by Distillation (ASTM D95)
Abstract
Accurate determination of water content is critical for the quality control and operational efficiency of petroleum products and bituminous materials. ASTM D95, standardized by the American Society for Testing and Materials (ASTM), provides a widely accepted method for quantifying water using a distillation procedure. This paper provides a comprehensive overview of ASTM D D95, detailing its scope, significance, apparatus, procedural methodology, and inherent limitations. The discussion highlights the method's reliance on azeotropic distillation to separate water from the sample, making it a benchmark procedure for field and laboratory analysis despite the emergence of more modern techniques such as Karl Fischer titration.