April 2016
Intermediate to advanced
252 pages
8h 35m
English
Content preview from Environmental Health
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38 Environmental Health: Indoor Exposures, Assessments and Interventions
[11]. PCB 47 is among the more volatile congeners, vapor pressure 8.63° 10–5 mm Hg
at 25 deg C [12], and it has a relative human accumulation factor of 0.03 [13] indicat-
ing that is among the less persistent PCB congeners. Its presence among the teachers
may reflect their recent exposure, as estimated human half-life values for 0.2 to 5.5
years have been reported [11] for PCB 47. By comparison, the estimated half-life for
PCB 153 ranges from 0.9 to 47 years.
FIGURE 2 PCA Score plot components 1 and 2 for teachers and MGH referents.
In the case of the 18 teachers in the ...
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