Atmospheric dibutyl phthalate (DBP) and diethylhexyl phthalate (DEHP) were sampled on a glass fiber filter and two polyurethane foam plugs in series by darwing 35 m
3 of an air sample at (11-14)
lmin for 48h and determined by a gas chromatograph with an electron capture detector via an extraction technique. The blank values of DBP and DEHP corresponding to 35m
3 of air were (3-10) ng/m
3 and (1-5) ng/m
3, respectively, and were less than one-eighth and one-tenth of the concentrations of DBP and DEHP, respectively, in the ambient air. The relative standard deviation of determined values of DBP in the ambient air was 4. 98% and that of DEHP was 6.48%. In the sampling, DBP tended to pass through the glass fiber filter, and DEHP tended to be trapped in great deal on the filter. The result shows that DBP is abundant in gas phase and DEHP is abundant in particulate phase. Concentrations of atmospheric DBP and DEHP were determined from October 1977 through October 1978 at Environmental Pollution Control Center. The yearly average concentrations of atmospheric DBP and DEHP were 192 ng/m
3 and 99. 1 ng/m
3, respe ctively. The concentrations of DBP (C
DBP) were highest in the summer and lowest in the winter. The concentrations of DEHP (C
DEHP) were higher in the summer than in the winter. The (C
DBP)/(C
DEHP) and (C
DBP)/concentrations of airborne particulate matter (C
PM) exponentially increased as ambient temperature increased. The yearly average of the (C
DBP)/(C
DEHP) value was 1. 76, and was much higher than the ratio of DBP to DEHP industrially produced in Japan. The correlation coefficient between (C
OBP) and (C
PM) was -0.012. These results suggest that the ambient contamination by DBP is mainly caused by vaporization of DBP from products containing DBP. The (C
DEHP)/(C
PM) value tended to be higher as ambient temperature increased. The correlation coefficient between (C
DEHP) to (C
PM) was 0.721. From these results the ambient contamination of DEHP seemed to be caused by emission from industrial factories, by cutting or abrasion of products containing DEHP and by vaporization of DEHP from products containing DEHP.
抄録全体を表示