Overview
ISO 23906-1:2020 specifies a validated laboratory method for the determination of benzo[a]pyrene (B[a]P) in the total particulate matter (TPM) of cigarette mainstream smoke. The method uses gas chromatography–mass spectrometry (GC‑MS) with methanol as the extraction solvent, and is defined for an intense smoking regime using the smoking parameters of ISO 20778. The standard covers sample preparation, instrumental analysis (SIM mode), calibration and reporting, and includes assessed repeatability and reproducibility from collaborative studies.
Key Topics and Requirements
- Sampling & conditioning: Follow ISO 8243 for cigarette sampling and ISO 3402 for conditioning prior to analysis.
- Smoking procedure: Use a routine analytical smoking machine and the generation/collection conditions specified in ISO 20779 and ISO 20778 (intense regime).
- TPM collection: Collect particulate matter on glass‑fibre filter pads.
- Extraction & clean‑up:
- Extract TPM with methanol.
- Dilute methanol extract with water and perform clean‑up using a cyclohexyl (CH) solid phase extraction (SPE) cartridge; elute B[a]P with cyclohexane.
- GC‑MS analysis:
- Use splitless injection on a capillary column (example: 30 m, 0.25 mm i.d., 0.25 µm film, (5 %-phenyl)-methylpolysiloxane).
- Operate the MS in single ion monitoring (SIM) for sensitive B[a]P detection.
- Standards & calibration:
- Prepare primary/secondary B[a]P stock solutions (examples given in the standard) and use B[a]P‑d12 as an internal standard.
- Prepare multiple working standards covering the analytical range and perform calibration in accordance with the document.
- Quality & reporting:
- Document apparatus, reagents (methanol, cyclohexane, toluene, helium), calibration, and test conditions.
- Report characteristic cigarette data, sampling details, and analytical results.
- Safety note: B[a]P and B[a]P‑d12 are carcinogens; appropriate safety controls are required.
Applications and Who Uses It
- Tobacco product testing laboratories implementing routine emissions testing and method validation.
- Regulatory authorities and compliance labs assessing product emissions for hazard characterization.
- Industry R&D and quality control teams monitoring B[a]P during product development or manufacturing changes.
- Analytical research groups studying PAHs in smoke and method comparison studies.
This method supports consistent, comparable measurements of B[a]P in cigarette mainstream smoke but, as the standard notes, machine measurements characterize emissions and are not direct measures of human exposure or risk.
Related Standards
- ISO 23906-2 (alternative B[a]P method with cyclohexane clean‑up and shorter analysis time)
- ISO 20778 (routine analytical smoking machine - definitions and conditions)
- ISO 20779 (generation and collection of TPM)
- ISO 8243 (cigarette sampling)
- ISO 3402 (conditioning)
- ISO 3696 (laboratory water quality)
Keywords: ISO 23906-1:2020, benzo[a]pyrene, B[a]P, cigarette mainstream smoke, GC‑MS, methanol extraction, TPM, ISO 20778, solid phase extraction, analytical method.