Benzoyl chloride is a volatile, reactive acyl chloride with a new 8-hour WEL of 2.8 mg/m³ (0.5 ppm). WES remains the reference until 30 November 2026; WEL applies from 1 December once implemented. Check the WHS regulator.
Measurement and SEGs
Exposure is typically vapour, with aerosol possible during spraying, vigorous transfer or containment failures. Define analyte, units, 8-hour TWA, task samples and peaks. Do not invent a STEL.
- Drum/IBC batch charging and vapour return.
- In-process sampling; filter and strainer change.
- Kilo-lab, pilot plant and maintenance line breaks.
- Spill response, waste and contractor work.
Separate charge operators, sampling technicians, filter crews, maintenance and laboratory SEGs. Log vessel temperature, purge, LEV, open time, location and RPE.
Sampling strategy
- Full-shift personal samples on representative campaign days plus task samples for open transfers.
- Agree sorbent/media with the laboratory for stability and recovery.
- Document flow, breakthrough, blanks, storage and transport.
- Use enough replicates to show campaign variability; static samples diagnose LEV only.
Interpretation and controls
Use 2.8 mg/m³ (0.5 ppm) as planning benchmark now and compliance comparator from 1 December when in force. Report LOD/LOQ and partial-shift assumptions. Peaks matter for irritation and control design; never fabricate a STEL. Address dermal risk separately.
- Closed charging, sealed transfer, vapour return and LEV.
- Minimise open time; use line-break permits and spill drills.
- Select compatible gloves, clothing and vapour RPE with fit testing.
Cite the lab method, distinguish compliance from diagnostics, and preserve SEG notes. Contact Occ Hygiene.
