Overview
Acid Value Standard Sample is a certified reference material (CRM) designed to measure the concentration of free fatty acids or acidic components in substances like oils, waxes, and biodiesel. It serves as a benchmark for titration-based analytical methods, ensuring traceability to international standards such as ISO 660 or ASTM D974. Industries rely on these standards to maintain compliance with regulatory requirements and internal quality protocols. The samples are typically pre-calibrated with a documented acid value (expressed in mg KOH/g), enabling laboratories to validate their testing equipment and procedures.
Physical and Chemical Properties
The physical state of Acid Value Standard Samples varies—liquid forms are common for ease of use, while solid standards may be provided as pellets or powders. Their chemical composition often mimics natural fatty acids (e.g., oleic or stearic acid) or synthetic equivalents to ensure representative behavior during analysis. Key attributes include high purity (≥95%), minimal water content, and resistance to oxidation. Stability is critical; reputable suppliers provide expiration dates and storage recommendations to prevent degradation. The acid value is typically certified with a narrow uncertainty range (e.g., ±0.5 mg KOH/g) to meet stringent accuracy demands.
Main Applications
These standards are indispensable in food production (e.g., edible oil refining), biodiesel manufacturing, and pharmaceutical excipient testing. They help detect spoilage in fats, assess feedstock quality, and monitor chemical reactions in real time. In petrochemical labs, acid value standards verify lubricant degradation. Environmental testing labs use them to analyze wastewater contaminants. The samples also support method development for novel analytical techniques like FTIR or automated titration systems.
Safety and Storage
While generally low-risk, Acid Value Standard Samples may irritate skin or eyes upon contact. Always handle in ventilated areas with PPE. Spills should be neutralized with bicarbonate solutions and wiped promptly. To preserve integrity, store unopened containers at 2–8°C for long-term stability. Once opened, use within the supplier’s specified timeframe (often 6–12 months) and avoid exposure to humid air. Discard discolored or phase-separated samples immediately.
B2B Procurement Guide
When sourcing Acid Value Standard Samples, prioritize suppliers accredited under ISO 17034 for reference material production. Request certificates of analysis (CoA) detailing traceability, measurement uncertainty, and batch homogeneity. For cost efficiency, consider bulk purchases of stable liquid standards with multi-year shelf lives. Validate compatibility with your lab’s solvents and equipment—some standards may require ethanol dilution. Leading manufacturers include Sigma-Aldrich, LGC Standards, and AccuStandard.
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