Particle Size Distribution Of Particle-Bound Pcdd/Fs In The Ambient Air Of Tire Manufacturing Workplaces
Concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were estimated for different particle-size distributions in a carbon black feeding process at a tire manufacturing plant on 15 days in March and April of 2014. Concentrations of thoracic particles and total particles produced in the carbon black feeding process of a tire manufacturing plant were measured in ranges of 0.19–2.61 mg/m3 and 0.28–4.22 mg/m3, respectively. On all sampling days, the three most abundant species of PCDD/Fs were OCDD, 1,2,3,4,6,7,8-HpCDF and OCDF. The mean concentrations of total PCDD/Fs were 0.74–6.83 pg/m3 within five particle size ranges. Total I-TEQ in PM<1.0 was 2.2 and 3.2 times higher than those in PM>18 and PM2.5-10, respectively. However, the total I-TEQ of thoracic PM contributed approximately 74% of the total I-TEQ of total PM.
Keywords- Tire manufacturing plant, Carbon black, Dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), Particles.