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204 <br /> 5. POTENTIAL FOR HUMAN EXPOSURE <br /> lead compounds in environmental media, particularly at hazardous waste sites, and an estimate of human <br /> intake would be helpful in establishing human exposure lead. The <br /> Exposure Levels in Humans. Lead can be measured in human blood, hair, perspiration, teeth, bones, meas meas <br /> feces, and urine (Aguilera et al. 1989; Batuman et al. 1989; Blakley and Archer 1982; Blakley et al. 1982; provi <br /> the i. <br /> Christoffersson et al. 1986; Delves and Campbell 1988; Ellen and Van Loon 1990; Exon et al. 1979; Hu Man} <br /> et al. 1989, 1990, 1991; Jason and Kellogg 1981; Manton and Cook 1984; NIOSH 1977a, 1977d, 1977e, fe <br /> 1977f, 1977g 1977h; Que Hee and Boyle 1988; Que Hee et al. 1985a; Wielopolski et al. 1986). The most by by f e <br /> common method of assessing human exposure involves measurement of lead in blood (Aguilera et al. 1989; Assoc <br /> Delves and Campbell 1988; Manton and Cook 1984; NIOSH 1977a, 1977d, 1977e, 1977f, 1977g 1977h; Que Addie <br /> Hee et al. 1985a). Blood lead levels have been correlated with ambient air exposure levels and dust, and limits <br /> dietary intake levels (Rabinowitz et al. 1985). Additional information on the biological monitoring of <br /> populations living in the vicinity of hazardous waste sites would be helpful in estimating exposure of these 6.1 <br /> populations to lead compounds. The relationships between the major biological monitoring media should <br /> be determined. Alkyl lead compounds can be measured in exhaled breath. Blood <br /> Exposure Registries. No exposure registries for lead were located. This substance is not currently one sampl <br /> of the substances for which a subregistry has been established in the National Exposure Registry. The graph <br /> substances will be considered in the future when chemical selection is made for subregistries to be induce <br /> established. The information that is amassed in the National Exposure Registry facilitates the exist <br /> epidemiological research needed to assess adverse health outcomes that may be related to the exposure to methc <br /> analys <br /> this substance. <br /> specia <br /> fluore; <br /> 5.7.2 On-going Studies voltarr <br /> As part of the Third National Health and Nutrition Evaluation Survey (NHANES III), the Environmental detern <br /> Health Laboratory Sciences Division of the Center for Environmental Health and Injury Control, Centers to the <br /> for Disease Control, will be analyzing human blood samples for lead. These data will give an indication It is p <br /> of the frequency of occurrence and background levels of these compounds in the general population. can de <br /> (Fell 1 <br /> in Tab <br /> Concei <br /> exposu <br /> Samplc <br /> the res <br /> lead cc <br /> have al <br /> 1984; P <br /> sensiti-v <br /> Delves <br /> compar <br /> quantif <br /> by the <br /> quantifi <br /> techniq <br /> authors <br />