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CHLORINATED DIBENZO-p-DIOXINS CAS No: 1746-01-6 CHLORINATED DIBENZOFURANS CAS No: 5120-73-19 I. PHYSICAL AND CHEMICAL PROPERTIES (From HSDB (1998) except as noted) 2,3,7,8-Tetrachlorodibenzo-p-dioxin Molecular weight 322 Boiling point decomposes (NIOSH, 1994) Melting point 305-306 ºC Vapor pressure 7.4 × 10 -10 mm Hg at 25 ºC Air concentration conversion not available 2,3,7,8-Tetrachlorodibenzofuran Molecular weight 305.99 Boiling point not available Melting point not available Vapor pressure not available Air concentration conversion not available II. HEALTH ASSESSMENT VALUES Congener Unit Risk Slope Factor (µg/m 3 ) -1 (mg/kg/day) -1 2,3,7,8-Tetrachlorodibenzo-p-dioxin 3.8 E+1 1.3 E+5 1,2,3,7,8-Pentachlorodibenzo-p-dioxin 1.9 E+1 6.5 E+4 1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin 3.8 E+0 1.3 E+4 1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin 3.8 E+0 1.3 E+4 1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin 3.8 E+0 1.3 E+4 1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin 3.8 E-1 1.3 E+3 1,2,3,4,5,6,7,8-Octachlorodibenzo-p-dioxin 3.8 E-2 1.3 E+2 2,3,7,8-Tetrachlorodibenzofuran 3.8 E+0 1.3 E+4 1,2,3,7,8-Pentachlorodibenzofuran 1.9 E+0 6.5 E+3 2,3,4,7,8-Pentachlorodibenzofuran 1.9 E+1 6.5 E+4 1,2,3,4,7,8-Hexachlorodibenzofuran 3.8 E+0 1.3 E+4 1,2,3,6,7,8-Hexachlorodibenzofuran 3.8 E+0 1.3 E+4 1,2,3,7,8,9-Hexachlorodibenzofuran 3.8 E+0 1.3 E+4 2,3,4,6,7,8-Hexachlorodibenzofuran 3.8 E+0 1.3 E+4 1,2,3,4,6,7,8-Heptachlorodibenzofuran 3.8 E-1 1.3 E+3 1,2,3,4,7,8,9-Heptachlorodibenzofuran 3.8 E-1 1.3 E+3 1,2,3,4,5,6,7,8-Octachlorodibenzofuran 3.8 E-2 1.3 E+2 [Linearized multistage procedure (GLOBAL79), fitted to male mouse hepatic adenoma and carcinoma data (NTP, 1982), body weight scaling, cross-route extrapolation (CDHS, 1986).] 167
III. CARCINOGENIC EFFECTS Human Studies Comprehensive reviews of the human studies of dioxin exposure and cancer risk available at the time the document entitled Health Effects of Chlorinated Dioxins and Dibenzofurans was written for the Toxic Air Contaminant (TAC) program (CDHS, 1986) are found in US EPA (1984) and Veterans Administration (VA) (1981, 1984). Dioxins have never been intentional products. In human exposure studies, PCDDs (polychlorinated dibenzo-p-dioxins) and PCDFs (polychlorinated dibenzofurans) have only been present as contaminants of other toxic chemicals, such as herbicides. Hence all studies of human PCDD/PCDF exposures have been studies of exposure to chemical mixtures that may have contained PCDD and PCDF. VA (1981, 1984) summarized what is known about the presence of PCDD and PCDF in commercially-used chemicals. In general, PCDDs and PCDFs may be present as contaminants in the herbicide 2,4,5-trichlorophenoxyacetic acid (2,4,5T). Levels of 2,3,7,8-TCDD in 2,4,5-T have been found as high as six parts per million (Rappe et al. 1982). Another widely used herbicide, 2,4-- dichlorophenoxyacetic acid (2,4-D) is generally regarded as uncontaminated with 2,3,7,8- Tetrachlorodibenzo-p-dioxin (TCDD). Cochrane et al. (1982) did detect traces of di-, tri-, and TetraCDD as high as one part per billion in technical grade 2,4-D from Canada. However, the TetraCDD isomer found in these samples was the 1,3,6,8-TCDD isomer, not the more toxic 2,3,7,8-TCDD. Agent Orange, which was a mixture of 2,4,5-T and 2,4-D, has been shown to contain 2,3,7,8-TCDD concentrations as high as 15-47 parts per million with an average of about 2 ppm (VA 1981). PCDDs and/or PCDFs have also been found in the parts per million range in commercially used polychlorinated biphenyls (PCB), trichlorophenol (TCP), tetrachlorophenol, and pentachlorophenol (PCP) (Rappe et al. 1982, Hardell 1983). Several case/control studies have been conducted in Sweden and in New Zealand. In these countries, phenoxyacetic acids and chlorophenols were used extensively for agriculture and forestry. After clinical observations of several patients with soft-tissue sarcomas (STS) and a history of heavy exposure to phenoxyacetic acids, Hardell and Sandstrom (1979) conducted a case/control study of STS and herbicide exposure. Cases were drawn from a university hospital in Northern Sweden, and consisted of 52 adult males with STS diagnosed between 1970 and 1977. Controls were drawn from general population registries, at a 4:1.matching ratio, and matched to cases on sex, age, place of residence, and vital status (whether alive or deceased). The investigators considered only non-malignant deaths for deceased controls. Study subjects (or their next of kin) provided exposure histories by a mailed questionnaire with a telephone follow-up. The odds ratio (OR) for exposure to phenoxyacetic acids only (excluding subjects exposed to chlorophenols) was 5.3 (95% confidence interval (95% CI) 2.4-11.5). For exposure to chlorophenols only (excluding those exposed to phenoxyacetic acids) the OR was 6.6 (95% CI 2.1-20.9). 168
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Air Toxics Hot Spots Program Risk A
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Prepared by: John D. Budroe, Ph.D.
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This document is one of five docume
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TABLE OF CONTENTS PREFACE i INTRODU
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N-Nitrosodimethylamine 401 N-Nitros
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Hot Spots Unit Risk and Cancer Pote
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Additional ATES and PETS documents
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data. If several data sets (dose an
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US EPA Calculation of Carcinogenic
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exposure to a concentration of 1 µ
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incidences for each of the dose lev
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computes the surface area of a sphe
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Comparison of Hot Spots Cancer Unit
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Gold, L., de Veciana, M., Backman,
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Animal Studies Rats Woutersen et al
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ased on sufficient evidence of carc
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ACETAMIDE CAS No: 60-35-5 I. PHYSIC
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Methodology Expedited Proposition 6
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cancer mortality. However, US EPA (
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Table 2. Lung adenoma incidence in
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Table 3 (continued). Acrylamide-ind
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Robinson M, Bull RJ, Knutsen GL, Sh
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Also, a trend was observed correlat
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eported. Cause-specific expected de
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Bio/Dynamics Inc. conducted a study
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examination. Interim sacrifices wer
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Table 8. Tumor incidence in male an
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Gaffey WR and Strauss ME. 1981. A m
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(technical grade; 98% pure) by gava
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International Agency for Research o
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still alive in the low-dose control
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ANILINE CAS No: 62-53-3 I. PHYSICAL
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fibrosarcomas, stromal sarcomas, ca
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ARSENIC (INORGANIC) CAS No: 7440-38
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elationship between arsenic exposur
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al. (1988) did not induce lung tumo
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A risk assessment was also conducte
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Chen C, Chuang Y, You S, Lin T and
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Schrauzer G, White D, McGinness J,
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Table 1: Summary of epidemiologic s
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had at least one animal demonstrati
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mesothelioma, recommended lifetime
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National Institute for Occupational
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BENZENE CAS No: 71-43-2 I. PHYSICAL
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Animal Studies Available experiment
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Table 3: Summary of NTP bioassay re
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Table 4: Summary of benzene low-dos
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Maltoni C, Conti B and Cotti G. 198
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a benign tumor of the kidney. No ba
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al. (1968) found no tumors in lifet
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following relationship, where C(t 1
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Miakawa M. and Yoshida O. 1975. Pro
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human population and that BPDE-DNA
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demonstrated the tumor initiating a
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Table 4: Bronchoalveolar tumors fro
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Table 5: IARC groupings of PAHs, mi
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Table 6 (continued): IARC Group 3 P
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Potency Equivalency Factors (PEF) f
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This was rounded to a PEF of 0.1. 1
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experiment (Takayama et al., 1985)
Page 125 and 126: Deutsch-Wenzel RP, Brune H, Grimmer
Page 127 and 128: Krewski D, Thorslund T and Withey J
Page 129 and 130: U.S. Environmental Protection Agenc
Page 131 and 132: Sorahan et al. (1983) studied cance
Page 133 and 134: Lijinsky W. 1986. Chronic bioassay
Page 135 and 136: the drinking water (Schroeder and M
Page 137 and 138: Table II. Effective dose, upper-bou
Page 139 and 140: BIS(2-CHLOROETHYL)ETHER CAS No: 111
Page 141 and 142: IV. DERIVATION OF CANCER POTENCY Ba
Page 143 and 144: BIS(CHLOROMETHYL)ETHER CAS No: 542-
Page 145 and 146: Table 1. Bis(chloromethyl)ether-ind
Page 147 and 148: Drew RT, Laskin S, Kuschner M and N
Page 149 and 150: ates for the 1968 U.S. male populat
Page 151 and 152: Table 1: Incidence of primary tumor
Page 153 and 154: IV. DERIVATION OF CANCER POTENCY Ba
Page 155 and 156: National Institute of Occupational
Page 157 and 158: was less than 0.05 when controlling
Page 159 and 160: up period. The final cohort include
Page 161 and 162: If the cadmium-exposed workers incl
Page 163 and 164: on personnel records (20%); (3) eva
Page 165 and 166: were exposed to a continuous (23.5
Page 167 and 168: procedure (NLIN), the parameters we
Page 169 and 170: International Agency for Research o
Page 171 and 172: Two reports were published on cance
Page 173 and 174: Mendel rats, respectively), and sub
Page 175: Eschenbrenner A and Miller E. 1946.
Page 179 and 180: cancers, were less than expected. T
Page 181 and 182: and no cases of cancer (although cl
Page 183 and 184: There was a statistically significa
Page 185 and 186: NTP (1982a) also conducted an carci
Page 187 and 188: Several pathologists have independe
Page 189 and 190: hepatocellular adenoma/carcinoma tu
Page 191 and 192: carcinogenic potency may decline in
Page 193 and 194: Cochrane W, Singh J and Miles W. 19
Page 195 and 196: North Atlantic Treaty Organization,
Page 197 and 198: CHLORINATED PARAFFINS (average chai
Page 199 and 200: ased on dose-response data for beni
Page 201 and 202: chloroform in drinking water with k
Page 203 and 204: Overall, the present epidemiologica
Page 205 and 206: female dogs received toothpaste bas
Page 207 and 208: Calculated q 1 * values from the ab
Page 209 and 210: Hogan MD, Chi Py, Hoel DG and Mitch
Page 211 and 212: Table 1. Study design summary for N
Page 213 and 214: V. REFERENCES California Environmen
Page 215 and 216: toluidine. Followup of this subcoho
Page 217 and 218: feeding studies on by NCI (1979) us
Page 219 and 220: CHROMIUM (HEXAVALENT) CAS No: 18540
Page 221 and 222: expected rate may be inflated becau
Page 223 and 224: Oral Borneff et al. (1968) exposed
Page 225 and 226: CREOSOTE (COAL TAR-DERIVED) CAS No:
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from an inhalation exposure study (
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U.S. Environmental Protection Agenc
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Table 1. Study design summary for N
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Table 1. Experimental design for ca
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Hazardous Substance Data Bank (HSDB
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Table 1: Tumor induction in Fischer
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Table 1. Experimental design of 2,4
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Additional analysis of these data b
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IV. DERIVATION OF CANCER POTENCY Ba
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Jackson RJ, Greene CJ, Thomas JT, M
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Table 1. Tumor incidence in rats ex
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Girard R, Tolot F, Martin P and Bou
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exposed more than 16 years before t
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interpretation of dose extrapolatio
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1, 1-DICHLOROETHANE CAS No: 75-34-3
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Table 1b. Study design for carcinog
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National Cancer Institute (NCI) 197
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mice, hepatocellular carcinoma inci
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V. REFERENCES California Department
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DAB/day by gavage for the life of t
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2,4-DINITROTOLUENE CAS No: 121-14-2
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Ellis et al.(1979) (also reported b
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Final Statement of Reasons for OAL,
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to the small sample size and short
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In an inhalation study, Torkelson e
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V. REFERENCES American Conference o
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EPICHLOROHYDRIN CAS No: 106-89-8 I.
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espiratory tumors were noted in the
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Table 4. Epichlorohydrin-induced fo
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Konishi Y, Kawabata A, Denda A, Ike
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exposed to arsenicals for 20 months
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espectively (all statistically sign
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ETHYLENE DICHLORIDE CAS No: 107-06-
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Several factors have been suggested
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myelogenous leukemias (4 and 8 year
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statistically significant. CDHS not
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combined with the incidence in the
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incidence of primary brain tumors.
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Table 6 (continued): Organ/Sex Mali
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An Upper 95% Confidence Limit (UCL)
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ETHYLENE THIOUREA (ETU) CAS No: 96-
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male and female rats. Tumor inciden
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FORMALDEHYDE CAS No: 50-00-0 I. PHY
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presented an extension of a previou
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Methodology In developing a spectru
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Casanova M, Morgan KT, Steinhagen W
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Tobe M, Kaneko T, Uchida Y, Kamata
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Table 1. Hexachlorobenzene-induced
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50 pups (F 1 ) of each sex were ran
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Ertürk E, Lambrecht RW, Peters HA,
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Table 1. Liver hepatoma incidence i
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1988). An airborne unit risk factor
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HYDRAZINE CAS No: 302-01-2 I. PHYSI
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Methodology Inhalation A linearized
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LEAD AND LEAD COMPOUNDS (INORGANIC)
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and other occupational carcinogens
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y inhalation is similar for rats an
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Goyer RA. 1992. Nephrotoxicity and
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LINDANE (g-Hexachlorocyclohexane) C
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Using these relationships, a human
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METHYL TERT-BUTYL ETHER (MTBE) CAS
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Tumor incidences according to the r
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kidney changes indicative of chroni
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Interspecies scaling for oral doses
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Table 4 (continued): Dose Response
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Experimental Pathology Laboratories
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Animal Studies Male and female HaM/
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Gold L, Sawyer C, Magaw R, Backman
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Using the statistical tests (one-ta
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Table 1: Methylene chloride-induced
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Significant treatment-related incre
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National Toxicology Program (NTP) 1
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noted; however, the study duration
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Crump KS, Howe RB, Van Landingham C
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Table 1. Michler’s ketone-induced
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NICKEL AND NICKEL COMPOUNDS CAS No:
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the high exposure group was 14.0. A
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male and 121 female rats, was expos
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2.1 - 2.6 × 10 -4 (µg/m 3 ) -1 .
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The increased incidence of bladder
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A linearized multistage procedure w
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N-NITROSO-N-METHYLETHYLAMINE CAS No
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propylamine in drinking water at 0.
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N-NITROSODIETHYLAMINE CAS No: 55-18
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Table 2. Treatment groups, concentr
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California Department of Health Ser
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animals and the second generation t
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ationale for selection of the OEHHA
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A unit risk value based upon air co
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N-NITROSODIPHENYLAMINE CAS No: 86-3
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Methodology Dosage estimates of NDP
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Crump KS, Howe RB. 1984. The multis
Page 423 and 424:
Table 1. P-Nitrosodiphenylamine-ind
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N-NITROSOMORPHOLINE CAS No: 59-89-2
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Page 429 and 430:
N-NITROSOPIPERIDINE CAS No: 100-75-
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Table 3. N-Nitrosopiperidine-induce
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Crump KS, Howe RB, Van Landingham C
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testicular tumors were noted in the
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PARTICULATE MATTER FROM DIESEL-FUEL
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etired railroad workers who had had
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employment (χ 2 test for trend: p
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elevated smoking-adjusted risk esti
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Table 1 (continued): Reference Miln
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Table 1 (continued): Reference Damb
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Table 1 (continued): Reference Burn
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Table 1 (continued): Reference Raff
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Table 1 (continued): Epidemiologica
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Table 1 (continued): Epidemiologica
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Table 1 (continued): Reference Wegm
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Animal Studies Section 6.1 (Animal
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The variability, or heterogeneity,
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estimate for those studies for whic
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Figure 1: Estimates of Relative Ris
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q 1 * = Excess relative risk × CA
Page 469 and 470:
Table 3: Number of Workers in the E
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u nexposed workers at zero concentr
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for each µg/m 3 of diesel exhaust
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Table 4: Values from Unit Risk for
Page 477 and 478:
their findings that a reasonable es
Page 479 and 480:
Garshick E, Schenker M, Woskie S an
Page 481 and 482:
Lewis T, Green, FH MW, Burg J and L
Page 483 and 484:
Rothman K. 1986. Modern epidemiolog
Page 485 and 486:
PENTACHLOROPHENOL CAS No: 87-86-5 I
Page 487 and 488:
The default lifespan for mice is 10
Page 489 and 490:
documented. An excess risk from ski
Page 491 and 492:
B6C3F 1 mice and F344/N rats were e
Page 493 and 494:
This model, rather than a time depe
Page 495 and 496:
POLYCHLORINATED BIPHENYLS (PCBs) CA
Page 497 and 498:
several benign adenomatous lesions
Page 499 and 500:
Ito et al. (1973) exposed groups of
Page 501 and 502:
could not be characterized by chlor
Page 503 and 504:
exposure (all pathways and mixtures
Page 505 and 506:
National Toxicology Program 1993. T
Page 507 and 508:
Table 1. Potassium bromate-induced
Page 509 and 510:
1,3-PROPANE SULTONE CAS No: 1120-71
Page 511 and 512:
Page 513 and 514:
PROPYLENE OXIDE CAS No: 75-56-9 I.
Page 515 and 516:
oxide. In the NTP carcinogenicity s
Page 517 and 518:
1,1,2,2-TETRACHLOROETHANE CAS No: 7
Page 519 and 520:
assumed a body weight of 70 kg and
Page 521 and 522:
total); an untreated control group
Page 523 and 524:
TOLUENE DIISOCYANATE CAS No: 26471-
Page 525 and 526:
Animal Studies The National Toxicol
Page 527 and 528:
Mortillaro PT and Schiavon M. 1982.
Page 529 and 530:
male or female rats. Increases in h
Page 531 and 532:
TRICHLOROETHYLENE CAS No: 79-01-6 I
Page 533 and 534:
A mortality analysis of a cohort of
Page 535 and 536:
elative to that of the controls whi
Page 537 and 538:
applied or metabolized. The range o
Page 539 and 540:
Katz RM and Jowett D. 1981. Female
Page 541 and 542:
10,000 ppm 2,4,6-trichlorophenol in
Page 543 and 544:
Page 545 and 546:
Bionetics Research Laboratories. 19
Page 547 and 548:
control; females: 6/10 exposed, 0/1
Page 549 and 550:
over controls (p < 0.04). Other tum
Page 551 and 552:
was increased (100/314 exposed vs.
Page 553 and 554:
Table 3. Cancer potency estimates f
Page 555 and 556:
Crouch E. 1983. Uncertainties in in
Page 557 and 558:
VINYL CHLORIDE CAS No: 75-01-4 I. P
Page 559 and 560:
Table 1 (continued): A Summary of E
Page 561 and 562:
al., 1983). Histopathology of all o
Page 563 and 564:
Table 3: Tumor incidences in 100 pp
Page 565 and 566:
experiment, animals were exposed to
Page 567 and 568:
Experiment BT1 Most previous risk a
Page 569 and 570:
No statistical analyses of mortalit
Page 571 and 572:
Table 11 gives unit risk estimates
Page 573 and 574:
Bertazzi PA, Villa A, Foa V, Saia B
Page 575 and 576:
Nicholson WJ, Hammond EC, Seidman H
Page 577 and 578:
immunotoxicity, reproductive toxici
Page 579 and 580:
scheme. TEFs for two major noncance
Page 581 and 582:
NATO/CCMS (1988a) Pilot Study on In
Page 583 and 584:
Table 2 Toxicity Equivalency Factor
Page 585 and 586:
Table 4 A Comparison of CTEF- and I
Page 587 and 588:
Office of Environmental Health Haza
Page 589 and 590:
Group 4: The agent is probably not
Page 591 and 592:
TECHNICAL SUPPORT DOCUMENT FOR DESC
Page 593 and 594:
US EPA IRIS Inhalation Unit Risk an
Page 595 and 596:
TECHNICAL SUPPORT DOCUMENT FOR DESC
Page 597 and 598:
as appropriate, and revise IRIS fil
Page 599 and 600:
Chemical Exposure Route Study Type
Page 601 and 602:
Page 603 and 604:
Page 605 and 606:
Methyl tert-butyl ether p. 5: Added
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