Overview - ISO 21294:2017 (Oilseeds sampling)
ISO 21294:2017 specifies requirements for manual or automatic discontinuous sampling of oilseeds to assess quality and condition (for example, odour from treatment products). The standard defines how to obtain representative increment, bulk and laboratory samples for both static lots and moving flows (loading/unloading). It emphasizes protecting samples and sampling equipment from contamination and retaining representativeness during reduction and transport.
Key topics and technical requirements
- Scope and terms: clear definitions for consignment, lot, increment sample, bulk sample, homogenization and laboratory sample.
- Principles: preference for sampling while oilseeds are in flow so every part of the lot has equal probability of selection; short sampling duration to avoid compositional changes; avoidance of segregation and adventitious contamination.
- Lot sizing and sampling intensity: consignments are divided into lots (typically 500 t to 5 000 t depending on consignment mass). Minimum numbers of increments and laboratory samples are specified by lot/consignment mass (examples in the standard include 20 increments for lots up to 500 t, 30 increments for 1 000 t lots, 40 increments for 2 500 t, 50 increments for 5 000 t).
- Methods for taking increments: requirements for the number and distribution of increments for bagged and bulk products, aggregation of increments into a bulk sample, and procedures for dividing bulk samples to laboratory size.
- Equipment and devices: selection and care of sampling tools (sack-type probes, cylindrical or conical samplers, shovels, hand-scoops, automatic samplers) and divisors; equipment must be clean, dry and non-contaminating.
- Bulk transfer specifics: guidance for sampling during transfer to lorries, wagons, barges, silos and conveyor belts (sampling from flow preferred; multiple positions in vehicles).
- Sample handling: homogenization, reduction to test sample (reference to ISO 664), packing, labelling, preservation and dispatch. Annex A and B provide step-by-step laboratory sampling and instrument examples.
Applications - who uses ISO 21294:2017
- Grain and oilseed traders, buyers and sellers for contract conformity and dispute resolution
- Port operators, bulk handlers and warehouse/silo managers for correct loading/unloading sampling
- Analytical laboratories and quality control teams to ensure representative test samples
- Logistics providers, inspection bodies and regulators performing official sampling and certification
Related standards
- ISO 664 - Oilseeds: reduction of laboratory sample to test sample (normative reference)
- ISO 21293 and the replaced ISO 542 (historical reference) - related oilseed sampling standards
ISO 21294:2017 helps minimize commercial disputes and analytical error by standardizing oilseeds sampling, ensuring representative, uncontaminated samples for accurate quality and condition assessment.
