Objective To compare the time weighted average concentrations (TWAC) of lead in air by individual sampling and fixed point sampling.
Methods Air lead was parallel sampled by individual sampling and fixed point sampling at workplace. According to the Methods for Determination of Lead and Its Compounds in the Air of Workplace (GBZ/T 160.10-2004), the time weighted average concentrations of lead in air were measured and compared.
Results There was no statistically significant difference between the lead TWACs estimated by individual sampling and fixed point sampling at the spots with general ventilation of the selected workplace. But at the spots with local ventilation, the results estimated by the two sampling methods showed statistically significant differences.
Conclusion In workplaces with local ventilation, the results of lead levels in air vary with sampling methods. Individual sampling could better reflect the actual exposure level.
DownLoad: