Figure 6-1. Frequency of NPL Sites with Hexachlorobenzene Contamination
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چکیده
Hexachlorobenzene has not been manufactured in the United States (as an end-product) since its last registered use as a pesticide was voluntarily canceled in 1984. Small amounts of hexachlorobenzene are still released to the environment by industrial activities as fugitive and stack emissions, or in waste water. It is released as a by-product during the manufacture of several chlorinated solvents or as an impurity in several currently registered pesticides. Additional amounts of hexachlorobenzene are also formed during combustion processes such as incineration of municipal refuse (EPA 1986b) or through use of pyrotechnic mixtures (Karlsson et al. 1991). Bailey (2001) provided a detailed analysis of the global emissions of hexachlorobenzene during the 1990s from these various sources (see Section 6.2).
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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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