What Is Gravimetric Analysis? A Guide for Materials Labs | Canrud

Gravimetric analysis is a quantitative analytical technique that determines a sample's composition or purity by precisely measuring mass changes — through drying, precipitation, or combustion — rather than relying on optical or spectroscopic signals.

How Gravimetric Analysis Works

The basic principle is straightforward: a sample is subjected to a controlled process (drying, calcination, or chemical precipitation) that isolates a specific component, and the mass before and after that process is compared to calculate composition, purity, or moisture content with high precision, provided the balance and process conditions are properly controlled.

Common Gravimetric Techniques in Battery Materials Research

Loss on Drying (LOD)

Measures moisture content by weighing a sample before and after controlled drying, a fundamental check for precursor powders and electrolyte components where residual moisture affects downstream synthesis or performance.

Loss on Ignition (LOI)

Measures the mass lost when a sample is heated to high temperature in air, useful for determining organic binder content in electrode coatings or volatile component content in precursor materials.

Precipitation Gravimetry

Determines the concentration of a specific ion or compound by precipitating it out of solution as an insoluble compound, then filtering, drying, and weighing the precipitate — a technique still used for certain purity verification tasks in precursor material characterization. Canrud's material evaluation & testing services incorporate gravimetric techniques alongside instrumental analysis for comprehensive material characterization.

Why Gravimetric Analysis Remains Relevant

Despite the rise of more sophisticated instrumental techniques, gravimetric analysis remains valuable because it's a direct, absolute measurement rather than one calibrated against a reference standard, making it a useful cross-check for validating results from other analytical methods. You can browse products for lab equipment supporting this kind of testing, and contact our team if you need help designing a characterization protocol for a new material.

Frequently Asked Questions

What is gravimetric analysis used for?

Gravimetric analysis is used to determine material composition, purity, or moisture content by precisely measuring mass changes through processes like drying, calcination, or precipitation.

What is loss on drying (LOD)?

LOD measures moisture content by weighing a sample before and after controlled drying, a common check for precursor powders and electrolyte components.

What is loss on ignition (LOI) used for?

LOI measures mass lost when a sample is heated to high temperature in air, commonly used to determine organic binder content in electrode coatings or volatile content in precursor materials.

Is gravimetric analysis still relevant compared to modern instrumental techniques?

Yes, gravimetric analysis provides a direct, absolute measurement rather than one calibrated against a reference standard, making it a useful cross-check for validating results from more sophisticated instrumental methods.

How accurate is gravimetric analysis?

Accuracy depends heavily on balance precision and careful control of the drying, ignition, or precipitation process, but well-executed gravimetric analysis can achieve very high precision for the properties it measures.

What is precipitation gravimetry?

Precipitation gravimetry determines the concentration of a specific ion or compound by precipitating it from solution, then filtering, drying, and weighing the resulting precipitate.

Can gravimetric analysis determine material purity?

Yes, when combined with knowledge of expected composition, gravimetric techniques like LOD and LOI help identify moisture, organic content, or other impurities that affect overall material purity.

Conclusion: Ready to Characterize Your Materials?

Gravimetric analysis may be one of the oldest analytical techniques in the toolkit, but its direct, calibration-independent nature keeps it relevant as a reliable cross-check in modern battery materials characterization.

Canrud has supported battery materials characterization for 10+ years, backed by a 100+ patent portfolio in battery technology. Our team can help you design a testing protocol that combines gravimetric and instrumental methods for your specific material.