Overview
ISO 5502:1992, titled "Oilseed Residues - Preparation of Test Samples," is an international standard developed by the International Organization for Standardization (ISO). This standard outlines the principles and methods for preparing representative test samples from oilseed residues. Oilseed residues include meals, extraction residues, expeller cakes, and slab cakes derived from oilseed processing through pressure or solvent extraction.
The standard ensures that test samples taken from laboratory samples accurately represent the whole sample, supporting reliable and consistent analysis in quality control and research settings.
Key Topics
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Sample Preparation Methodology
The standard specifies grinding laboratory samples with or without preliminary breaking, crushing, or drying. This process reduces the sample to a size suitable for analysis while maintaining the integrity of its composition.
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Representative Sampling
The test sample is obtained by dividing the ground material using specialized equipment such as conical dividers, multiple-slot dividers, or quartering tools. These devices ensure uniform distribution of sample components for consistent results.
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Equipment Specifications
- Mechanical mills designed to grind oilseed residues without heating or altering moisture/oil content.
- Crushing apparatus like pestles and mortars for preliminary sample size reduction.
- Sieves of 1.00 mm and 2.80 mm aperture size conforming to ISO 565 for particle size control.
- Sample containers that protect the test sample from compositional changes during storage.
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Treatment of Different Sample Conditions
The standard provides guidelines for grinding fine, coarse, and very coarse samples, including handling moist samples to avoid moisture loss or gain during preparation. Special cases requiring particular grinding fineness are also addressed.
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Moisture and Volatile Matter Content Correction
A correction factor calculation is included to adjust the analysis results for moisture and volatile matter changes resulting from sample preparation. This ensures data reflects the original laboratory sample composition accurately.
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Storage Protocols
Prepared test samples must be promptly transferred to appropriate containers and sealed to prevent changes before analysis.
Applications
ISO 5502:1992 is essential for laboratories and industries involved in the processing, quality testing, and research of oilseed residues. Key applications include:
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Quality Control in Oilseed Processing
Ensures repeatable and accurate sample preparation for determining oil content, moisture, volatile matter, and other critical parameters in meals, cake, and extraction residues.
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Agricultural Product Analysis
Supports uniform testing practices across laboratories analyzing plant-based products and oilseed derivatives.
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Research & Development
Provides standardized procedures enabling reliable experimentation and product development involving oilseed residues.
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Regulatory Compliance
Helps meet international testing requirements related to sampling protocols and analytical accuracy in the agricultural and food sectors.
Related Standards
- ISO 5500:1986 – Oilseed residues sampling procedures, detailing methods to obtain the initial laboratory sample.
- ISO 771:1977 – Determination of moisture and volatile matter content in oilseed residues, supporting the correction factor process in ISO 5502.
- ISO 565:1990 – Specifications for test sieves made of metal wire cloth used for grading particles.
- ISO 8892:1987 – Determination of total residual hexane in oilseed residues, relevant for samples prepared under ISO 5502 guidelines.
By adhering to ISO 5502:1992, laboratories can ensure that oilseed residue test samples are consistently prepared with minimal compositional changes, enabling accurate and reproducible results in oilseed analysis. This standard plays a vital role in global agricultural product quality assurance and standardization efforts.
