EN 12918:1999

EN 12918:1999 - Overview

EN 12918:1999 (CEN) specifies validated analytical procedures for the determination of parathion, parathion‑methyl and selected other organophosphorus compounds in water. The method uses dichloromethane extraction of water samples followed by gas chromatographic (GC) analysis. It applies to drinking water, surface water and wastewater, and may be adapted for other organic contaminants depending on compound chemistry and matrix. Typical achievable concentrations are up to about 1 µg/L, with a reporting limit of 0.001 µg/L for drinking waters when using a 1000:1 extraction ratio.

Key Topics and Technical Requirements

• Scope and applicability: Methods tailored for organophosphorus pesticides in varied water matrices (drinking, surface, waste).
• Sample preparation: Liquid–liquid extraction using dichloromethane to isolate target compounds from aqueous samples.
• Analytical technique: Gas chromatography employed for separation and quantification of parathion, parathion‑methyl and other organophosphorus analytes.
• Performance characteristics: Typical working range up to ~1 µg/L; reporting limits down to 0.001 µg/L under defined extraction ratios.
• Quality assurance: Emphasis on calibration, method validation, recovery checks and control of matrix effects to ensure reliable GC results.
• Adaptability: Method may be suitable for additional organic compounds; sensitivity and applicability depend on analyte properties and water matrix.

Applications and Who Uses This Standard

• Environmental laboratories conducting pesticide monitoring in rivers, lakes and effluents.
• Drinking water testing facilities that require low reporting limits for public-health compliance.
• Regulatory agencies setting and enforcing pesticide concentration limits in water.
• Wastewater treatment operators monitoring removal efficiency of organophosphorus compounds.
• Public health and research institutions studying pesticide occurrence, transport and fate in aquatic systems.

Practical benefits include standardized sample extraction and GC workflows that support comparable, legally defensible results across laboratories and monitoring programs. The method’s documented detection limits and extraction-ratio guidance help laboratories design sampling and concentration steps to meet regulatory reporting needs.

Related Standards

• EN 12918:1999 is a CEN document; it has national adoptions (e.g., SIST EN 12918:2000).
• Users often consult other CEN/ISO methods for complementary pesticide and organic contaminant analyses and for broader physicochemical methods of analysis in water.

Keywords: water quality, parathion, parathion‑methyl, organophosphorus, dichloromethane extraction, gas chromatography, GC analysis, drinking water testing, environmental monitoring, analytical method.