Selecting the right elemental analyzer begins well before the instrument is even switched on. It starts with a clear understanding of the sample: its matrix complexity, its homogeneity, and the level of representativeness the application demands.
For homogeneous or effectively homogenizable matrices, such as pharmaceutical compounds, pure organic substances, or well-prepared solid and liquid samples, the Velp EMA 502 offers a precise and efficient micro CHNS-O solution. Milligram-scale sample amounts, combined with tin foil or capsule-based preparation, enable accurate combustion, excellent repeatability, and high-throughput routine analysis with minimal material consumption.
When the matrix is inherently heterogeneous, environmental samples, biomass, sludge, waste, coal, or coke, the Velp EMA 402XL provides a macro CHNS approach designed to meet that challenge. Larger sample masses improve representativeness and reduce variability linked to matrix complexity, while reusable ceramic crucibles support cost-efficient, reliable routine workflows even on the most demanding samples.
There is no universally superior approach. The right choice is the one aligned with the sample, the analytical objective, and the confidence level required by the workflow.