Urinary beryllium--a suitable tool for assessing occupational and environmental beryllium exposure?

Area of Science:

• Occupational Health
• Environmental Science
• Analytical Chemistry

Background:

• Biological monitoring of beryllium (Be) has progressed slowly due to limited exposure data and inadequate analytical methods.
• Previous reference values for urinary Be may be inaccurate due to low method specificity and sensitivity.

Purpose of the Study:

• To correlate airborne beryllium concentrations with urinary beryllium levels.
• To assess the suitability of urinary beryllium as a biomarker for occupational exposure.

Main Methods:

• Examined 65 metallurgical workers and 30 controls across steel plants and foundries.
• Monitored airborne Be concentrations using area samplers.
• Measured urinary Be levels at the end of shifts using ICP-MS.

Main Results:

• Significant correlation found between external (airborne) and internal (urinary) beryllium exposure.
• Airborne Be concentrations ranged from 0.03 to 0.31 microgram/m³.
• Urinary Be levels were between 0.12 and 0.15 microgram/l, generally below the recommended TLV-TWA.

Conclusions:

• Current data are insufficient to establish a Biological Exposure Index (BEI) for urinary beryllium.
• Further research is required to refine dose indicators and understand the external-internal exposure relationship for beryllium.