The identity of the 209 pcb congeners is shown in table 42. We use cookies to ensure that we give you the best experience of our website. Pcb congener composition of aroclors a detailed analyses of the pcb congener distributions present in aroclors 1016, 1242, 1248, 1254, and 1260. It is composed of mono to heptachlorinated homologs. Aroclor synonyms, aroclor pronunciation, aroclor translation, english dictionary definition of aroclor. Figure 2 relative composition of pcb isomers and congeners in aroclor 1268. Since the congener composition of aroclor 1268 differs substantially from that of the predominant pcb mixture aroclor 1254 used to derive the csfs, the validity of applying existing csfs to. Avoid r eject firefighting water to enter environment.
Relatively rare pcb accounted for approximately 10% of worldwide production of pcbs generally used as a plastisizer in caulking and roofing compounds was not previously known to be present in any quantity at ames research center. Indole 3carbinola novel approach to breast cancer prevention. Northeast waste management officials association newmoa. The composition of commercial clophen a60 and phenoclor dp6 is similar to aroclor 1260. Typical pcb aroclor composition by congener class percentage of the total chlorine in the aroclor contained in this congener congener homologue class level of chlorination aroclor 1016 1242 1248 1254 1260. This document is written for region 4 project managers, onscene coordinators, and technical staff and provides a recommended approach for the evaluation and characterization of polychlorinated biphenyls pcbs in groundwater, soil, and sediment in order to support defensible and protective remedy. There is no warranty of accuracy or completeness of any information contained herein. Aroclor 1260 one detection of aroclor 1260 occmted in past sampling events. Information provided on aroclor 1242 53469219 is for reference only and is subject to change. Polychlorinated biphenyls pcbs are a group of 209 synthetic organic compounds with 110 chlorine atoms attached to biphenyl. Polychlorinated biphenyls were once widely deployed as dielectric and coolant fluids in electrical apparatus, carbonless copy paper and in heat transfer fluids because of their longevity, pcbs are still widely in use, even though their manufacture has declined drastically since the 1960s.
Aroclor plus aroclors 1262 and 1268 and congener analysis may be necessary in order to evaluate the weathering that may have occurred. Identification and quantitation of pcb aroclor mixtures in. Aroclor 1254 is one of several commercial pcb mixtures that were marketed between the 1930s and 70s. Also, the lighter aroclors were clear and the heavier ones had a darker quality to them. Development of an oral cancer slope factor for aroclor 1268. Comparison of the compositions of aroclor 1242 and aroclor. Comparison of the compositions of aroclor 1242 and aroclor 1016. Aroclor 1242 high level pcb1242h organic standards. Use water spray or fog for cooling exposed containers. The present analysis indicates that aroclor 1268 is likely to be 12 orders of magnitude less potent than aroclor 1254 in terms of potential tumorigenicity.
The information in cameo chemicals comes from a variety of data sources. Dale walker agilent gcms applications engineer lets take a closer look at what. The hazard fields include special hazard alerts air and water reactions, fire hazards, health hazards, a reactivity profile, and details about reactive groups assignments and potentially incompatible absorbents. This extensive contamination has led to us epa superfund designation in estuarine areas in and around purvis creek, ga. Aroclor 1221 had the viscosity of a light machine oil. Building materials, electronics production, industrial chemical, paints, coatings, resins. Srm 3080 aroclor 1260 in transformer oil transformer oil, pcb, water, voc, vocs, epa, epa organic compounds related to water analysis, aroclor, aroclor 1260 certificate msds table add material to cart certificate material safety data sheet msds. Aroclors 1016 and 1242 have similar capillary gas chromatography gc. Aroclor 1268 standard safety data sheet according to regulation e c no. Aroclor 1260 aroclor 1262 aroclor 1268 total pcb output is organized and summed by aroclor pattern.
Both empirical evidence and mechanistic considerations indicate aroclor 1268 is substantially less toxic and carcinogenic than the pcb mixtures that have been used by the usepa to develop csfs. Region 4 sesd has incorporated aroclor 1268 into their pcb. Two other sampling events showed nondetect result for aroclor 1260 at tl1is well location mw359b. Separate analyte names, cas numbers, or element abbreviations with a hard return enter key, or paste list directly into the box. Epa region 4 technical services section issue paper for. Pcb data set 1 is provided in the supplementary material on this books website. Both the in vitro and in vivo findings support the novel concept of chlorpyrifos as an.
Distribution and sources of pcbs aroclor 1268 in the. Aroclor 1268 is a highly chlorinated pcb mixture that was released into the aquatic environment near brunswick, ga br, as a result of decades of local industrial activity. For characterization of subsurface soil and groundwater nature and extent, the. Environmental health perspectives differential effects of two lots of aroclor 1254. Aroclor 1242 had approximately 150 ppb of chlorinated dibenfurans, of which 43% was the toxic 2,3,7,9tetrachloro isomer. On the chemistry side, there are 209 different pcb molecules called congeners, and each of the aroclors is a. We have therefore undertaken the task of developing cancer potency estimates specifically for aroclor 1268. Indication of any immediate medical attention and special treatment needed.
World health organization, internation agency for research on cancer,lyon, france single copies can be ordered from who publications centre. Distribution and characterization of polychlorinated biphenyl. If pcb napl is suspected then the lab should be notified so they can prepare to handle a highly contaminated sample. Ecological and regulatory implications of pcb aroclor 1268. Supelco aroclor standard mix 1, aroclor standard 200 ugml dichloromethane 1x1ml, aroclor standard 200 ugml hexane 1x1ml. A polychlorinated biphenyl pcb is an organic chlorine compound with the formula c 12 h 10. Dioxinlike pcbs are less prevalent in aroclor 1268 compared with most. The only exception to the naming convention is aroclor 1016, which was actually similar to the composition of aroclor 1242, with a chlorine percentage of 41.
Human limited evidence imemdt iarc monographs on the evaluation of carcinogenic risk of chemicals to man. Dale published november 2007 to be presented a1 wm 2008 phoenix wm symposia, inc. Polychlorinated biphenyls, another longlife widespread. Aroclor 1268 was pretty much a solid at room temperature. This light yellow viscous liquid is a particularly highly chlorinated pcb mixture which, by definition, contains 54% chlorine by weight. Deposition of organochlorine pesticides, pcbs aroclor. We have determined the congener compositions of nine commercial. In our previous studies, spatial distribution and composition of pcbs. Identification of the substancemixture and of the companyundertaking 1. For the comparison, foliage of eastern red cedar juniperus virginiana was also collected to monitor contaminant. Als environmental does not sell chemicals, but offers analytical lab testing to determine the presence of various elements and chemical compounds. Rpc1016 product name aroclor 1016 pcb 1016 index number 602039004 ec number 2156481 cas number 12674112 1. With the exception of aroclors 1221 and 1268, aroclors do not crystallize.
Monochlorobiphenyls dichlorobiphenyls trichlorobiphenyls. Since the congener composition of aroclor 1268 differs substantially from that of the predominant pcb mixture aroclor 1254 used to derive the csfs, the validity of applying existing csfs to aroclor 1268 is questionable. Indole3carbinola novel approach to breast cancer prevention. Aroclor 1268 standard persistence and degradability may cause longterm adverse effects in the environment. Hepatocellular carcinoma was the most frequently found lesion in animals sacrificed at the end of the experiment, observed in 2, 3, and 61% of the animals in the control, clophen a30 and clophen. This test method describes the use or aroclors 1016, 1221, 1232, 1242, 1248, 1254, 1260, 1262, and 1268, as reference standards, but others could also be included. The chemical identity of the aroclors is summarized in table 41. Example of documented pcb dechlorination processes and pathways, including pathways resulting in an increase in pcb19 and pcb4. There were nine common pcb aroclor mixtures 1221, 1232, 1242, 1016, 1248, 1254, 1260, 1262, and 1268, and each of them has a distinctive gas chromatographic pattern. Aroclors 1221, 1232, 1242, 1254, 1260, and 1268 were the commercial pcb products that. Differences between the pcb aroclors oreilly, talbot. Concentrations of dioxinlike pcb congeners in unweathered. Percen t composition allows us to see ar oclor fingerprint in the e nvironmental and biol ogical samples.
Measuring pcbs as aroclors relies on there being a relatively fixed composition of pcb congeners in the mixture. Deposition of organochlorine pesticides ocps, polychlorinated biphenyls pcbs and polybrominated diphenyl ethers pbdes were measured in loblolly pine needles pinus taeda collected in and around a linden chemicals and plastics lcp superfund site at brunswick, georgia, usa. A significant p composition in aroclor 1016, 1232, 1242, 1248, 1254, 126 0 and 1268. The batch chlorination process used to produce aroclors generated several congeners of the same chlorine content, in addition to congeners of higher and lower chlorine contents. Comparison of composition of aroclor mixtures tested. Bioaccumulation and toxic potential of extremely hydrophobic. Congenerspecific compositions of example marketed aroclors. Nist srm order request system srm 3080 aroclor 1260 in. Pcb1268 polychlorinated biphenyl mixture with 68% chlorine. Polychlorinated biphenyls pcbs agency for toxic substances.
Production, importexport, use, and disposal chemical company produced aroclors 1221, 1232, 1242, 1248, 1254, 1260, 1262, and 1268. Aroclor 1248 is a commercial mixture of pcbs with an average chlorine content of 48%. The complete polychlorinated biphenyl compositions of two american products, aroclor 1242 and its more modern replacement, aroclor 1016, have been determined by gasliquid chromatography glc on twelve liquid phases of differing selectivities. Pcb congener composition of aroclors 1248 top and 1260 bottom19 figure 23.
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