Occurrence, distribution and human exposure of phthalic esters in road dust samples across China.

Occurrence, distribution and human exposure of phthalic esters in road dust samples across China. Environ Res. 2020 Sep 15;:110222 Authors: Li B, Zhao ZB, Thapa S, Sun SJ, Ma LX, Geng JL, Wang K, Qi H Abstract 203 road dust samples were conducted across China covering 28 provinces from January to February，2016 to comprehensively investigates the occurrence, distribution and human exposure of 21 phthalic esters (PAEs). The concentration of Σ21PAEs in road dust ranged from 2.3 to 531 mg/kg, with a mean concentration of 64.1 ± 57.2 mg/kg. DEHP, DnBP and DiBP were the dominant components accounting for 63.3 - 97.9% (mean: 92.1%) of the Σ21PAEs. Significant Pearson correlation (r=0.51, p< 0.0001) between Σ21PAEs concentrations and longitude demonstrated a distinguished geographical trend. Higher concentration of PAEs in sidewalk (SW) and trunk road (TR) may reflect influence of human activities such as shoe wear and traffic load. Significant differences were found among different human activities area (urban commercial, urban residential, and suburbs/rural). For total daily intake of Ʃ21PAEs via street dust, children had the highest exposure risk followed by teenagers and adults with the median values of 160.8, 43.6, and 37.7 ng/kg-bw/day, respectively. The maximum exposure risk of PAEs calculated based on measurement and simulation were all far below reference values. The sensitivity analysis results demonstrated that concentra...
Source: Environmental Research - Category: Environmental Health Authors: Tags: Environ Res Source Type: research