1 / 20

Occupational Exposure to Metalworking Fluids

Occupational Exposure to Metalworking Fluids. Presented at the Occupational Hygiene Association of Ontario Spring Symposium March 28, 2007 By Lorraine Shaw, B.Sc., CIH, ROH Occupational and Environmental Health Laboratory, McMaster University. Outline. Overview

arvin
Download Presentation

Occupational Exposure to Metalworking Fluids

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Occupational Exposure to Metalworking Fluids Presented at the Occupational Hygiene Association of Ontario Spring Symposium March 28, 2007 By Lorraine Shaw, B.Sc., CIH, ROH Occupational and Environmental Health Laboratory, McMaster University

  2. Outline • Overview • Types of MWF, Health Effects, Standards, Exposure Assessment • Objectives of the Study • Methodology • Selection of Plants, Laboratory Investigation, Field Investigation, QC and Statistics • Results • Laboratory and Field Results • Conclusions

  3. Types of MWFs: Oil-based: Insoluble (neat) Soluble (30% - 85% oil) Water-based: Semi-synthetic (5%-30% oil) Synthetic (no oil) Health Effects: Cancer Hypersensitivity Pneumonitis (HP) Respiratory Effects Dermatitis Overview (I)

  4. Regulations and Exposure Standards: Ontario Ministry of Labour: Oil, mineral, mist 5 mg/m3 TWAEV, 10 mg/m3 STEV ACGIH TLV-TWA (Mineral Oil) in 2006 notice of intended changes : Mineral Oil Used in metal working Poorly and mildly refined 0.2 mg/m3 (Inhalable) A2 Highly and severely refined 0.2 mg/m3 (Inhalable) A4 Proposed NIOSH REL for all types of MWF (1998): 0.5 mg/m3(Total) 0.4mg/m3 (Thoracic) Exposure Assessment: Sampling Devices: ie. Total, Thoracic (BGI), IOM, Direct Reading Instrument (DustTrak) Particle size selective sampling Overview (II)

  5. The Three Size Fractions

  6. Objectives • Assess and Validate Analytical Methods • Assess Air Sampling Methods • Collect Current Representative Occupational Exposure Data • Assess Exposure Exceedance • Compare Ontario Exposure with Published Data (Mainly Water-Based MWF’s)

  7. Methodology • Selection of 4 Plants in Ontario • Laboratory Investigation • Field Investigation • Quality Control and Statistical Analysis

  8. Laboratory Investigation • NIOSH Method (0500) – Total Aerosol • NIOSH 5524 – Extractable MWFs • HSE Method (MDHS 95) – Marker Element • Sample Recovery • Detection Limits • Sample Stability During Storage

  9. Field Investigation • Collection of Air Samples • Personal • Area • Size Selective Samples • Total • Thoracic (MMAD = 10 µm) • Respirable (MMAD = 4 µm) • Inhalable (MMAD = 100 µm) • Direct Reading Instrument (DustTrak)

  10. Air Sampling Devices Total Sampler IOM Inhalable Sampler DustTrak Aerosol Monitor Direct Reading Instrument BGI 2.69 Cyclone Thoracic Sampler Respicon Size-Selective Particle Sampler

  11. Occupational Exposure

  12. Examples of Machining Fluids

  13. Examples of Finished Products

  14. QC and Stats • QUALITY CONTROL • Laboratory • Field • STATISTICAL ANALYSIS • Excel and Minitab 13

  15. Results: Laboratory Investigation • Sample Recovery • Our Study 83.5% • NIOSH Study 95 % • Detection Limit • Our Study 35µg • NIOSH Study 28 µg • Storage Study (Sample Stability) • Room Temp – NOT Stable • Refrigerator – 2 days • Freezer – 7 days

  16. Results:Airborne Concentrations (mg/m3) • % Exceedance is based on log normal distribution • ze = -log(GM/STD) / log(GSD)

  17. Relationship of Total vs Thoracic

  18. Conclusions (I) • HSE method proved problematic • Both NIOSH method 0500 or 5524 can be used • preferred method is the 5524 • Detection limits, sample recovery etc. were similar to NIOSH study • Samples should NOT be stored at Room Temp • Samples should be analyzed within 2 or 7 days depending on storage temperature

  19. Conclusions (II) • Ratio of Thoracic to Total aerosol is about 0.7 • Range of exposures in Ontario (0.04 to 3.84 mg/m3) is similar to others (NIOSH & OSHA) • Percent exceedance based on data set and assumption of log normality is 38% with respect to NIOSH REL • Respiratory effects reported at levels below 0.5 mg/m3 • Total Protection requires AIR, DERMAL and FLUID management

  20. Thank youThis research study was funded by a grant from the WSIB

More Related