ISO 16000-3:2022

Overview

ISO 16000-3:2022 specifies an active sampling method for measuring formaldehyde and other carbonyl compounds in indoor and test-chamber air. The standard defines collection on silica gel cartridges coated with 2,4‑dinitrophenylhydrazine (DNPH) and subsequent analysis of the formed hydrazones by HPLC with UV (or diode array) detection. The method yields a time‑weighted average (TWA) sample and is applicable to concentrations approximately from 1 µg/m3 to 1 mg/m3. It is suitable for both short‑term (5 min–60 min) and long‑term (1 h–24 h) sampling. The method is specific to formaldehyde but can be adapted to quantify at least a dozen other aldehydes and ketones; it is not suitable for longer‑chain or some unsaturated carbonyls.

Key topics and requirements

• Sampling principle: active draw of air through DNPH‑coated silica gel cartridges to derivatize carbonyls to stable hydrazones.
• Analysis: desorption of hydrazones and quantification by HPLC‑UV / diode array with validated calibration.
• Performance range: ~1 µg/m3 to 1 mg/m3; provides TWA results.
• Sampling durations: flexible - short‑term (5–60 min) and long‑term (1–24 h).
• Target analytes: formaldehyde plus other carbonyls such as acetaldehyde, acetone, benzaldehyde, propionaldehyde, valeraldehyde, hexanal, tolualdehydes, isovaleraldehyde and others tested in the document.
• Quality assurance: process blanks, cartridge preparation or use of commercial pre‑coated cartridges, HPLC calibration, system performance checks, and procedures to assess sample loss and uncertainty.
• Limitations: interference considerations (e.g., ozone), unsuitability for certain long‑chain/unsaturated carbonyls, and updated guidance on acrolein suitability.
• Safety & lab competence: normal laboratory practice and conformity with laboratory competence standards (e.g., ISO/IEC 17025).

Applications

• Indoor air quality (IAQ) monitoring in homes, offices, schools and test chambers.
• Emission testing of building materials, furniture, adhesives and insulation that release formaldehyde or other carbonyls.
• Occupational hygiene surveys where formaldehyde exposure needs quantification.
• Research studies of indoor pollutant sources, ventilation effectiveness, and VOC/carbonyl fate.
• Regulatory compliance and product testing where formaldehyde limits apply.

Who should use this standard

• Environmental and analytical laboratories performing indoor air testing.
• Industrial hygienists, IAQ consultants, material testing labs, and researchers.
• Regulatory bodies and certification organizations setting or enforcing indoor air limits.

Related standards

• ISO 16000 series (indoor air sampling strategy, other parts)
• ISO 16000-2 (sampling strategy)
• ISO 16017 and ISO 12219 (VOC measurements)
• ISO/IEC 17025 (laboratory competence)

Keywords: ISO 16000-3:2022, indoor air, formaldehyde, carbonyl compounds, DNPH, HPLC, active sampling, silica gel cartridges, TWA, indoor air quality.