09.02.2014 Views

home edit2 whole TSD November 2002 PDF format - OEHHA

home edit2 whole TSD November 2002 PDF format - OEHHA

home edit2 whole TSD November 2002 PDF format - OEHHA

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

POLYCHLORINATED BIPHENYLS (PCBs)<br />

CAS No: 1336-36-3 (all congeners)<br />

I. PHYSICAL AND CHEMICAL PROPERTIES (From HSDB, 1995 except as noted)<br />

Molecular weight 154 - 499<br />

Boiling point<br />

Unknown<br />

Melting point<br />

340-375° C<br />

Vapor pressure 4.06E-4 mm Hg @ 25°C (Aroclor 1242)<br />

7.71E-5 mm Hg @ 25°C (Aroclor 1254)<br />

Air concentration conversion 1 ppm = 10.87 mg/m 3 (Aroclor 1242)<br />

1 ppm = 13.33 mg/m 3 (Aroclor 1254)<br />

II.<br />

HEALTH ASSESSMENT VALUES<br />

Unit Risk Factor: 5.7 E-4 (µg/m 3 ) -1 (For use in cases where food chain exposure,<br />

sediment or soil ingestion, dust or aerosol<br />

inhalation, dermal exposure (if an absorption<br />

factor has been applied to reduce the external<br />

dose), presence of dioxin-like, tumorpromoting,<br />

or persistent congeners in other<br />

media or early-life exposure (all pathways and<br />

mixtures) is expected.)<br />

1.1 E-4 (µg/m 3 ) -1 (For use in cases where ingestion of watersoluble<br />

congeners, inhalation of evaporated<br />

congeners or dermal exposure (if no absorption<br />

factor has been applied to reduce the external<br />

dose) is expected.)<br />

2.0 E-5 (µg/m 3 ) -1 (For use in cases where congeners with more<br />

than four chlorines comprise less than one-half<br />

percent of total PCBs)<br />

[Calculated from a cancer potency factor derived by US EPA/IRIS (1996c) from rat liver<br />

tumor data (Norback and Weltman, 1985; Brunner et al., 1996), using a linear-quadratic<br />

multistage procedure and ¾ power body weight scaling to calculate an ED 10 (estimated dose<br />

associated with 10 percent increased incidence), and its lower bound, LED 10 . ]<br />

486

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!