Figure 6-1. Frequency of NPL Sites with Plutonium and Selected Isotopes Contamination
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چکیده
Trace amounts of plutonium are found worldwide, mostly due to fallout from atmospheric nuclear testing, which ended in 1980, and released several isotopes of plutonium, including Pu, Pu, Pu, and Pu (Clark et al. 2006; DOE 2005a; Eisenbud and Gesell 1997). Plutonium is not naturally occurring; however, trace amounts of Pu are found in naturally occurring uranium ores, but the amounts are in such small amounts that extraction is not practical (Clark et al. 2006; Lide 2005). Small amounts of Pu exist in nature from remnants of primordial stellar nucleosynthesis (Clark et al. 2006). Small amounts of plutonium were produced in natural reactors, such as the Oklo natural reactor in the African nation of Gabon, which existed about 2 billion years ago (DOE 2005a). The most common form of plutonium found in the environment is Pu, followed by Pu (DOE 1999a).
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Figure 6-1. Frequency of NPL Sites with 1,2-Dichlorobenzene Contamination
1,2-, 1,3and 1,4-Dichlorobenzene (DCB) have been identified in at least 281, 175, and 330, respectively, of the 1,662 hazardous waste sites that have been proposed for inclusion on the EPA National Priorities List (NPL), respectively (HazDat 2005). However, the number of sites evaluated for these DCB isomers is not known. The frequency of these sites can be seen in Figures 6-1, 6-2, and 6-3. Of...
متن کاملFigure 6-1. Frequency of NPL Sites with 1,2-Dichlorobenzene Contamination
1,2-, 1,3and 1,4-Dichlorobenzene (DCB) have been identified in at least 281, 175, and 330, respectively, of the 1,662 hazardous waste sites that have been proposed for inclusion on the EPA National Priorities List (NPL), respectively (HazDat 2005). However, the number of sites evaluated for these DCB isomers is not known. The frequency of these sites can be seen in Figures 6-1, 6-2, and 6-3. Of...
متن کاملFigure 6-1. Frequency of NPL Sites with Atrazine Contamination
Atrazine has been identified in at least 20 of the 1,636 hazardous waste sites that have been proposed for inclusion on the EPA National Priorities List (NPL) (HazDat 2003). However, the number of sites evaluated for atrazine is not known. The frequency for these sites within the United States can be seen in Figure 6-1. Of these sites, all 20 are located within the United States and none are lo...
متن کاملFigure 6-1. Frequency of NPL Sites with Naphthalene Contamination
Naphthalene, 1-methylnaphthalene, and 2-methylnaphthalene have been identified in at least 654, 36, and 412, respectively, of the 1,662 hazardous waste sites that have been proposed for inclusion on the EPA National Priorities List (NPL) (HazDat 2005). However, the number of sites evaluated for naphthalene, 1-methylnaphthalene, and 2-methylnaphthalene is not known. The frequency of these sites ...
متن کاملFigure 6-2. Frequency of NPL Sites with Organotin Contamination
Tin and organotin compounds have been identified in at least 214 and 8 sites, respectively, of the 1,662 hazardous waste sites that have been proposed for inclusion on the EPA National Priorities List (NPL) (HazDat 2004). However, the number of sites evaluated for tin and organotin compounds is not known. The frequency of these sites can be seen in Figures 6-1 and 6-2, respectively. All sites w...
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