Joint Sealants: An Overlooked Diffuse Source of Polychlorinated Biphenyls in Buildings
- 12 February 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 39 (7), 1967-1973
- https://doi.org/10.1021/es048632z
Abstract
In October 2000, joint sealants containing polychlorinated biphenyls (PCB) were discovered in various public buildings in Switzerland. Triggered by this event, a nationwide comprehensive study was initiated by the Swiss Agency for the Environment, Forests, and Landscape, and 1348 samples of joint sealants as well as 160 indoor air samples from concrete buildings erected between 1950 and 1980 were analyzed. Out of 1348 samples, 646 (48%) contained PCB. In 279 (21%) samples, PCB concentrations of 10 g/kg and more were detected, and concentrations of 100 g/kg of PCB or more were found in 129 (9.6%) samples. These data indicate that PCB were widely used as plasticizers in joint sealants in Switzerland. In buildings constructed between 1966 and 1971, one-third of all joint sealants investigated contained more than 10 g/kg of PCB. PCB concentrations exceeding the limit of 0.050 g/kg above which material is required to be treated as PCB bulk product waste were reached by 568 samples (42%). PCB with a chlorine content between 45 and 55%, corresponding to mixtures such as Clophen A50, Aroclor 1248, and Aroclor 1254, were encountered in 316 samples (70%). In 42 cases (26%) where joint sealants containing PCB were present, clearly elevated PCB indoor air concentrations above 1 μg/m3 were encountered. In eight cases (5%), levels were higher than 3 μg/m3. The Swiss tentative guideline value of 6 μg/m3 (based on a daily exposure of 8 h) for PCB in indoor air was exceeded in one case (0.6%). On the basis of this work, representing the first large-scale nationwide analysis of the issue of PCB-contaminated joint sealants, we estimate that there are still 50−150 t of PCB present in these materials, acting as diffuse sources. They are distributed over many hundreds of buildings all over the country and represent a significant but frequently overlooked inventory of PCB. In light of the Stockholm Convention on persistent organic pollutants that entered into force last year, reduction of the release of PCB from these widely used materials is an important issue to be addressed.Keywords
This publication has 11 references indexed in Scilit:
- An Unrecognized Source of PCB Contamination in Schools and Other BuildingsEnvironmental Health Perspectives, 2004
- Coplanar Polychlorinated Biphenyls (PCB) in Indoor AirEnvironmental Science & Technology, 2002
- PCB-blood levels in teachers, working in PCB-contaminated schoolsChemosphere, 2000
- Sanierung von hochgradig mit polychlorierten Biphenylen (PCB) belasteten Innenräumen durch komplettes Entfernen der Primär- und SekundärquellenDas Gesundheitswesen, 2000
- Determinations of PCB within a project to develop cleanup methods for PCB-containing elastic sealant used in outdoor joints between concrete blocks in buildingsPublished by Royal Society of Chemistry (RSC) ,1999
- Human Exposure to Polychlorinated Biphenyls (PCBs): A Critical Assessment of the Evidence for Adverse Health EffectsRegulatory Toxicology and Pharmacology, 1995
- Sampling and analysis of polychlorinated biphenyls (PCB) in indoor air due to permanently elastic sealantsChemosphere, 1993
- Polychlorinated biphenyls. Indoor air contamination due to thiokol-rubber sealants in an office buildingChemosphere, 1992
- Polychlorinated biphenyls in indoor airEnvironmental Science & Technology, 1981
- Long-term studies of residue retention and excretion by cows fed a polychlorinated biphenyl (Aroclor 1254)Journal of Agricultural and Food Chemistry, 1973