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Toxicological Profile for Cadmium

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Toxicological Profile for Cadmium CADMIUM A-1 APPENDIX A. ATSDR MINIMAL RISK LEVELS AND WORKSHEETS The Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) [42 U.S.C. 9601 et seq.], as amended by the Superfund Amendments and Reauthorization Act (SARA) [Pub. L. 99– 499], requires that the Agency for Toxic Substances and Disease Registry (ATSDR) develop jointly with the U.S. Environmental Protection Agency (EPA), in order of priority, a list of hazardous substances most commonly found at facilities on the CERCLA National Priorities List (NPL); prepare toxicological profiles for each substance included on the priority list of hazardous substances; and assure the initiation of a research program to fill identified data needs associated with the substances. The toxicological profiles include an examination, summary, and interpretation of available toxicological information and epidemiologic evaluations of a hazardous substance. During the development of toxicological profiles, Minimal Risk Levels (MRLs) are derived when reliable and sufficient data exist to identify the target organ(s) of effect or the most sensitive health effect(s) for a specific duration for a given route of exposure. An MRL is an estimate of the daily human exposure to a hazardous substance that is likely to be without appreciable risk of adverse noncancer health effects over a specified duration of exposure. MRLs are based on noncancer health effects only and are not based on a consideration of cancer effects. These substance-specific estimates, which are intended to serve as screening levels, are used by ATSDR health assessors to identify contaminants and potential health effects that may be of concern at hazardous waste sites. It is important to note that MRLs are not intended to define clean-up or action levels. MRLs are derived for hazardous substances using the no-observed-adverse-effect level/uncertainty factor approach. They are below levels that might cause adverse health effects in the people most sensitive to such chemical-induced effects. MRLs are derived for acute (1–14 days), intermediate (15–364 days), and chronic (365 days and longer) durations and for the oral and inhalation routes of exposure. Currently, MRLs for the dermal route of exposure are not derived because ATSDR has not yet identified a method suitable for this route of exposure. MRLs are generally based on the most sensitive chemical-induced end point considered to be of relevance to humans. Serious health effects (such as irreparable damage to the liver or kidneys, or birth defects) are not used as a basis for establishing MRLs. Exposure to a level above the MRL does not mean that adverse health effects will occur. MRLs are intended only to serve as a screening tool to help public health professionals decide where to look more closely. They may also be viewed as a mechanism to identify those hazardous waste sites that CADMIUM A-2 APPENDIX A are not expected to cause adverse health effects. Most MRLs contain a degree of uncertainty because of the lack of precise toxicological information on the people who might be most sensitive (e.g., infants, elderly, nutritionally or immunologically compromised) to the effects of hazardous substances. ATSDR uses a conservative (i.e., protective) approach to address this uncertainty consistent with the public health principle of prevention. Although human data are preferred, MRLs often must be based on animal studies because relevant human studies are lacking. In the absence of evidence to the contrary, ATSDR assumes that humans are more sensitive to the effects of hazardous substance than animals and that certain persons may be particularly sensitive. Thus, the resulting MRL may be as much as 100-fold below levels that have been shown to be nontoxic in laboratory animals. Proposed MRLs undergo a rigorous review process: Health Effects/MRL Workgroup reviews within the Division of Toxicology and Human Health Sciences (proposed), expert panel peer reviews, and agency- wide MRL Workgroup reviews, with participation from other federal agencies and comments from the public. They are subject to change as new information becomes available concomitant with updating the toxicological profiles. Thus, MRLs in the most recent toxicological profiles supersede previously published levels. For additional information regarding MRLs, please contact the Division of Toxicology and Human Health Sciences (proposed), Agency for Toxic Substances and Disease Registry, 1600 Clifton Road NE, Mailstop F-62, Atlanta, Georgia 30333. CADMIUM A-3 APPENDIX A MINIMAL RISK LEVEL (MRL) WORKSHEET Chemical Name: Cadmium CAS Numbers: 7440-43-9 Date: September, 2012 Profile Status: Post-Public Comment Draft 2 Route: [X] Inhalation [ ] Oral Duration: [X] Acute [ ] Intermediate [ ] Chronic Graph Key: 16 Species: Rat Minimal Risk Level: 0.03 [ ] mg/kg/day [X] μg Cd/m3 Reference: NTP. 1995. Cadmium oxide administered by inhalation to F344/N rats and B6C3F1 mice. National Toxicology Program, U.S. Department of Health and Human Services, Research Triangle Park, NC. Experimental design: Groups of five male and five female F344 rats were exposed to 0, 0.1, 0.3, 1, 3, or 10 mg cadmium oxide/m3 (0, 0.088, 0.26, 0.88, 2.6, or 8.8 mg Cd/m3) 6.2 hours/day, 5 days/week for 2 weeks. The mean MMAD of the cadmium oxide particles was 1.5 μm with a geometric standard deviation of 1.6–1.8. The animals were observed twice daily and weighed on days 1 and 8, and at termination. Other parameters used to assess toxicity included organ weights (heart, kidney, liver, lungs, spleen, testis, and thymus) and histopathological examination (gross lesions, heart, kidney, liver, lungs, tracheobronchial lymph nodes, and nasal cavity and turbinates). Effect noted in study and corresponding doses: All rats in the 8.8 mg Cd/m3 group died by day 6; no other deaths occurred. A slight decrease in terminal body weights was observed at 2.6 mg Cd/m3; however, the body weights were within 10% of control weights. Significant increases in relative and absolute lung weights were observed at 0.26 (males only), 0.88, and 2.6 mg Cd/m3. Histological alterations were limited to the respiratory tract and consisted of alveolar histiocytic infiltrate and focal inflammation in alveolar septa in all rats exposed to ≥0.088 mg Cd/m3, necrosis of the epithelium lining alveolar ducts in all rats exposed to ≥0.26 mg Cd/m3, tracheobronchiolar lymph node inflammation at ≥0.88 mg Cd/m3 (incidences in the 0, 0.088, 0.26, 0.88, 2.6, and 8.8 mg Cd/m3 groups were 0/3, 0/5, 5/5, 5/5, and 3/4 in males and 0/4, 1/5, 1/5, 3/5, 5/5, and 3/5 in females), degeneration of the nasal olfactory epithelium at 0.88 mg Cd/m3 (0/5, 0/5, 0/5, 2/5, 5/5, and 5/5 in males and 0/5, 0/5, 0/5, 4/5, 4/5, and 4/4 in females) and inflammation (0/5. 0/5. 0/5, 1/5, 5/5, and 3/5 in males and 0/5, 0/5, 0/5, 0/5, 4/5, and 3/4 in females) and metaplasia (0/5. 0/5. 0/5, 1/5, 0/5, and 5/5 in males and 0/5, 0/5, 0/5, 0/5, 4/5, and 4/4 in females)of the nasal respiratory epithelium at 2.6 mg Cd/m3. Dose and end point used for MRL derivation: The LOAEL of 0.088 mg Cd/m3 was selected as the point of departure for derivation of the MRL; benchmark dose analysis was considered; however, the data were not suitable for benchmark dose analysis because the incidence data for alveolar histiocytic infiltration do not provide sufficient information about the shape of the dose-response relationship below the 100% response level. [ ] NOAEL [X] LOAEL Uncertainty Factors used in MRL derivation: [X] 10 for use of a LOAEL [X] 3 for extrapolation from animals to humans with dosimetric adjustment CADMIUM A-4 APPENDIX A [X] 10 for human variability Was a conversion factor used from ppm in food or water to a mg/body weight dose? No. If an inhalation study in animals, list conversion factors used in determining human equivalent dose: The LOAELHEC was calculated using the equations below. LOAELHEC = LOAELADJ x RDDR The duration-adjusted LOAEL (LOAELADJ) was calculated as follows: 3 LOAELADJ = 0.088 mg Cd/m x 6.2 hours/24 hours x 5 days/7 days 3 LOAELADJ = 0.016 mg Cd/m The regional deposited dose ratio (RDDR) for the pulmonary region of 0.617 was calculated with EPA’s RDDR calculator (EPA 1994a) using the final body weight of 0.194 kg for the male rats exposed 0.088 mg Cd/m3, the reported MMAD of 1.5 μm and the midpoint of the reported range of geometric standard deviations (1.7) 3 LOAELHEC = 0.016 mg Cd/m x 0.617 3 LOAELHEC = 0.01 mg Cd/m Was a conversion used from intermittent to continuous exposure? Yes (see above) Other additional studies or pertinent information that lend support to this MRL: The acute toxicity of airborne cadmium, particularly cadmium oxide fumes, was first recognized in the early 1920s and there have been numerous case reports of cadmium workers dying after brief exposures to presumably high concentrations of cadmium fumes (European Chemicals Bureau 2007). The initial symptoms, similar to those observed in metal fume fever, are usually mild but rapidly progress to severe pulmonary edema and chemical pneumonitis. Persistent respiratory effects (often lasting years after the exposure) have been reported in workers surviving these initial effects. There are limited monitoring data for these human reports; however, Elinder (1986b) estimated that an 8-hour exposure to 1–5 mg/m3 would be immediately dangerous.
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