Assessing occupational mercury exposures and behaviours of artisanal and small-scale gold miners in Burkina Faso using passive mercury vapour badges.
Artisanal and small-scale gold mining (ASGM) is a crucial economic activity in Burkina Faso, however it is associated with significant mercury exposure and health concerns. The aim of the present study was to assess the level of mercury (Hg) vapour exposures and occupational behaviours at a representative site using Hg vapour monitor badges and questionnaires. To our knowledge this is the first time that personal exposure to Hg vapour during ASGM activities has been reported. The study population were ASGM workers who completed a questionnaire (n=100) or participated with an occupational exposure assessment using commercially available passive Hg vapour samplers (n=44). Occupational exposure to Hg was high during open-air burn events with a time weighted average (TWA) exposure of 7026±6857µg/m3for burners, and 1412±2870µg/m3for bystanders. Most (82%) of the people present at the burn exceeded the Permissible Exposure Limit (PEL) of 100µg/m3, and 11% exceeded the level considered to be Immediately Dangerous to Life and Health (IDLH) of 10,000µg/m3. Even control workers who were not present at the burn exceeded the PEL (24%), likely due to legacy Hg contamination producing latent Hg releases to the atmosphere. Similarly, 86% of the miners at the burn and 59% of control workers had an 8-h TWA that exceeded the Recommended Exposures Limit (REL). Several occupational behaviours that may contribute to Hg exposures were documented. This study corroborates previous studies suggesting that Hg exposure during amalgam burning is very high, and demonstrates the plausibility of using passive vapour monitoring badges rather than costly and logistically difficult biomonitoring methods. Mercury reduction and elimination interventions are strongly needed to reduce Hg exposure in ASGM communities, particularly as countries come into compliance with the Minamata Convention.
School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada; Artisanal Gold Council, 101-732 Cormorant Street, Victoria, BC V8W 4A5, Canada. Electronic address: paleah@alumni.uottawa.ca.
Paleah
P
Black
Artisanal Gold Council, 101-732 Cormorant Street, Victoria, BC V8W 4A5, Canada.
Myrianne
M
Richard
Artisanal Gold Council, 101-732 Cormorant Street, Victoria, BC V8W 4A5, Canada.
Ricardo
R
Rossin
School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada; Artisanal Gold Council, 101-732 Cormorant Street, Victoria, BC V8W 4A5, Canada; Department of Geography, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada.
Kevin
K
Telmer
D000328:Adult; D000393:Air Pollutants / Q000032:analysis*; D002050:Burkina Faso; D004781:Environmental Exposure; D004784:Environmental Monitoring / Q000379:methods*; D005260:Female; D005740:Gases / Q000032:analysis; D006801:Humans; D008297:Male; D008628:Mercury / Q000032:analysis*; D008875:Middle Aged; D000067572:Miners; D016273:Occupational Exposure; D055815:Young Adult
D000393:Air Pollutants; D005740:Gases; D008628:Mercury
Artisanal and small-scale gold mining (ASGM); Mercury vapour; Occupational behaviours; Occupational exposure; Open-air burning