Overview - EN ISO 24333:2009 (Cereals and cereal products - Sampling)
EN ISO 24333:2009 (ISO 24333:2009) is the international/CEN standard that specifies requirements for dynamic and static sampling of cereals and cereal products, using manual or mechanical methods. It defines the sampling workflow from taking increments to producing an aggregate sample, homogenizing and dividing it into laboratory samples for analysis of quality, condition and contaminants.
Key scope points:
- Applies to assessment of quality, condition, heterogeneously distributed contaminants, and parameters usually homogeneously distributed.
- Can be used to determine insects in grain lots.
- Applicable to sampling lots of GMOs for quality/condition but not suitable for detecting adventitious GM material in non-GM products.
- Not applicable to seed grain (see ISTA rules).
Key topics and technical requirements
- Sampling types: flowing (dynamic) and static sampling; packed‑unit sampling (manual) for sacks/retail packs.
- Increment → Aggregate → Laboratory sample: standard defines increments (single point samples), aggregation and homogenization, and division for laboratory testing.
- Equipment & hygiene: sampling devices must be clean, dry, odour‑free and accessible for inspection and maintenance; materials should avoid electrostatic charge where relevant.
- Mechanical vs manual methods: device selection depends on product, flow speed and required increment frequency. Crosscut samplers and suction probes are described; annexes give examples of devices.
- Depth and lot considerations: special provisions for static bulk depth (manual probes up to ~2 m; mechanical up to ~2.5 m if no segregation; suction devices for greater depths). One laboratory sample per lot or sub‑lot up to 1 500 t; lots deeper than 9 m require flow sampling.
- Handling & chain of custody: protect samples from contamination, seal if sampling stages are prolonged, label and ship samples properly; joint sampling for arbitration is recommended.
Practical applications
- Standardizes grain sampling procedures for commodity traders, grain elevators, mills, food processors and testing laboratories.
- Used for regulatory inspections, quality control, contamination and pest assessments, contract compliance and dispute arbitration.
- Helps ensure representative sampling for analytical testing (mycotoxins, pests, foreign matter, moisture, etc.) and reliable laboratory results.
Who should use this standard
- QA/QC managers in grain handling and milling
- Laboratory managers and food analysts
- Commodity traders, inspectors and auditors
- Equipment manufacturers designing mechanical samplers
- Regulatory bodies and certification schemes
Related standards and references
- Replaces earlier ISO 6644:2002 and ISO 13690:1999 (see foreword).
- For seed grain sampling, refer to ISTA rules (ISO 24333 is not applicable).
- ISO/TR 29263 is referenced for sampling mass ranges and practices.
Keywords: EN ISO 24333:2009, cereal sampling, grain sampling standard, sampling procedure, aggregate sample, laboratory sample, mechanical sampling devices, static and dynamic sampling, GMO sampling, insect detection, contaminant sampling, quality control.
