Related Experiment Video
Updated: May 14, 2026
Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
Homogeneity Guarantee of Nickel Reference Material in Soybean Matrix: Influence Mechanism of Particle Size
Nuojia Wang1, Zengwang Guo1, Yanxiang Wu2
1College of Food Science, Northeast Agricultural University, Harbin 150030, China.
None:
In response to the demand for reference material under the EU Maximum Levels for Nickel (Ni) limit in soybeans (15 mg/kg) in 2024, this study explored the technical difficulty of ensuring the homogeneity of Ni reference material in the soybean matrix. Multi-scale characterization (LA-ICP-MS, ICP-MS, FT-IR, etc.) verified that Ni was specifically enriched in embryo and the finer powder (mainly embryo). Based on this finding, we innovatively proposed the span [(D90 - D10)/D50] as a rapid predictor to evaluate homogeneity, offering a potential screening tool to optimize grinding conditions and reduce reliance on time-consuming traditional homogeneity assessments (Ni-RSD by ICP-MS). A positive correlation between span and homogeneity was observed, which was attributed to the inhomogeneous distribution of low-Ni tissue (seed coat). By optimizing the crushing process (hammer cyclone milling, room temperature: 20 °C, 15,000 r/min, ≤ 0.45 mm sieve), a homogeneity uncertainty of 1.00% was obtained. This finding helps in ensuring the homogeneity of reference materials from other high-fat oilseed matrixes.
Related Concept Videos
01:03Precipitation Gravimetry
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
01:16Precipitate Formation and Particle Size Control
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...