Usage of Air Monitoring and Biomarkers of Isocyanate Exposure to Assess the Effect of a Control Intervention

Exposure to isocyanates is known to have respiratory effects in workers and
therefore it is essential to monitor the occupational exposure. An earlier
study of a continuous foaming plant using toluene diisocyanate (TDI) showed
that the exposure to isocyanates can be high.

Since then several preventive actions were implemented at the plant. The aim of
this study was to observe the effect of these actions measured by air and
biological monitoring. The median TDI air concentrations in 2005 were 20% of
the 2000 levels and the median levels of biomarkers in 2005 were 10% of the
2000 levels.

According to the measurements the preventive action had a real effect to
decrease the exposure to TDI. As the workers both before and after the
preventive actions used personal protective equipment, the use of biomarkers
was necessary to assess the real gain in the preventive actions.

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AplusA-online.de - Source: Annals of Occupational Hygiene