Occupational lead exposure in Denmark: screening with the haematofluorometer

Area of Science:

• Occupational Health
• Toxicology
• Biochemistry

Background:

• Lead exposure is a significant occupational hazard.
• The zinc protoporphyrin/haemoglobin (ZPP/Hb) ratio is a biomarker for lead exposure.
• Assessing lead exposure is crucial for preventing adverse health effects.

Purpose of the Study:

• To evaluate the utility of the ZPP/Hb ratio as a screening tool for lead exposure.
• To establish correlations between ZPP/Hb ratios, blood lead levels, and occupational groups.
• To determine a threshold for ZPP/Hb ratio indicating the need for blood lead analysis.

Main Methods:

• Field measurement of ZPP/Hb ratio using a haematofluorometer.
• Blood lead level analysis in a subset of the study population.
• Comparison of ZPP/Hb ratios across various occupational groups with differing lead exposure levels.

Main Results:

• A significant increase in ZPP/Hb ratio was observed with advancing age in men without known excess lead exposure.
• Specific occupations, including secondary lead smelting and battery manufacture, showed ZPP/Hb ratios exceeding the established blood lead limit.
• Elevated ZPP/Hb ratios and blood lead levels were associated with decreased haemoglobin concentration.

Conclusions:

• The haematofluorometer is a valuable tool for screening occupational lead exposure.
• A ZPP/Hb ratio exceeding 300 mumol ZPP/mol Hb(Fe) warrants blood lead determination.
• Monitoring ZPP/Hb ratios can help identify workers at risk of lead toxicity and associated health issues.