Overview
EN ISO 14181:2000 - "Animal feeding stuffs - Determination of residues of organochlorine pesticides - Gas chromatographic method" (CEN adoption of ISO 14181:2000) specifies a validated gas‑chromatographic procedure for measuring residues of selected organochlorine pesticides in animal feeding stuffs. The method covers target compounds such as aldrin, dieldrin, endrin, HCB, several HCH isomers, DDT/DDE/TDE isomers and methoxychlor, and includes lower determination limits as stated in the standard (e.g. 0.005 µg/g for most listed pesticides; 0.01 µg/g for o,p′‑DDT and p,p′‑DDT; 0.05 µg/g for methoxychlor).
Key topics and technical requirements
- Scope and targets: Specifies which organochlorine pesticides, isomers and degradation products are covered.
- Analytical principle: Extraction with acetone, partitioning into dichloromethane, concentration and clean‑up on a 10% water‑deactivated silica gel column, followed by gas chromatography.
- Detection: Uses gas chromatography with an electron capture detector (ECD) or a mass selective detector (GC–MS) for quantification and confirmation.
- Reagents and materials: Solvents (hexane, acetone, dichloromethane), anhydrous sodium sulfate, saturated sodium chloride, silica gel (10% water‑deactivated), and specified pesticide reference standards and internal standards (e.g., mirex or pentachloronitrobenzene).
- Quality controls: Procedures for preparing standards and internal standards, blank checks, recovery assessment, repeatability/reproducibility reporting and confirmation of identity.
- Reporting and limits: Guidance on expression of results, calculation and test reporting in accordance with the standard.
Applications and users
EN ISO 14181:2000 is practical for:
- Feed testing laboratories performing routine pesticide residue analysis in animal feeding stuffs.
- Regulatory authorities enforcing feed safety limits and monitoring organochlorine contamination.
- Quality control teams in feed production evaluating raw materials and finished feed compliance.
- Environmental and forensic labs requiring validated GC methods for organochlorine residue screening and confirmation.
Benefits include standardized sample preparation and cleanup, traceable quantification for regulatory compliance, and compatibility with GC–ECD or GC–MS instrumentation commonly used in analytical labs.
Related standards
- The method references laboratory water quality (ISO 3696) and sample preparation standards for animal feeding stuffs (e.g., ISO 6498). Consult annexes in EN ISO 14181 for normative references and example GC operating conditions.
Keywords: EN ISO 14181:2000, organochlorine pesticides, animal feeding stuffs, gas chromatographic method, pesticide residues, GC‑ECD, GC‑MS, feed analysis, residue determination.