Sulfuric acid exposure can occur in many Canadian workplaces, including metal finishing, battery manufacturing, chemical production, fertilizer plants, and facilities where acid is heated, sprayed, or agitated. Tasks such as tank cleaning, acid dilution, electroplating, and maintenance on scrubbers or pickling lines can generate airborne sulfuric acid mist in the worker’s breathing zone. Effective control relies on engineering measures, well-designed ventilation, appropriate PPE, and air monitoring strategies that accurately capture the thoracic fraction of sulfuric acid aerosol in accordance with Canadian exposure limits. LCS Laboratory provides sampling pumps, thoracic sampling cyclones, and laboratory analysis for sulfuric acid in workplace air.
Sulfuric acid mist and thoracic sampling requirements
Sulfuric acid is a non-volatile acid and, in occupational settings, is present as aerosolized droplets or mist rather than vapour. For exposure assessment, it should be collected as particulates or mist. In Canada and in several other jurisdictions, regulations specify that only the thoracic fraction of sulfuric acid mist should be sampled, reflecting the portion of particles capable of depositing in the tracheobronchial region. Historically, this requirement was not fully supported by available sampling technologies, leaving industrial hygienists and consultants with methods that did not match regulatory intent.
Thoracic fraction sampling technique at LCS Laboratory
LCS Laboratory Inc. offers a sampling technique where the thoracic fraction of sulfuric acid mist is collected on a 37 mm MCE filter using a size-selective thoracic cyclone BGI GK 2.69 operating at 1.6 L/min. This configuration targets the thoracic aerosol fraction required for compliance with Canadian exposure limits.
Samples are analyzed by the OSHA ID-113 method using ion chromatography, providing quantitative results for sulfuric acid in the thoracic size range. Depending on production activity and expected concentrations, sampling durations typically range from 1 to 8 hours, allowing both task-based and full-shift assessments.
Support for Canadian industrial hygienists, consultants, and EHS professionals
This thoracic fraction sampling approach helps Canadian industrial hygienists, consultants, and EHS professionals align their sulfuric acid monitoring programs with current occupational exposure limits and particle-size conventions. The method produces defensible data for compliance evaluations, exposure investigations, and verification of engineering and administrative controls in workplaces where sulfuric acid mist may be present.
To discuss sulfuric acid air sampling strategies, equipment selection, or analytical options, please contact LCS Laboratory Inc. to review your air sampling needs. ©
