We have identified coal tar pitch, a very cheap organic material made from coal during the iron-making process, as a source from which could be obtained emissive molecules for organic light-emitting diodes. Coal tar pitch was separated by simple dissolution in organic solvent, and subsequent separation by preparative thin-layer chromatography was used to obtain emissive organic molecules. The r...

Polycyclic aromatic hydrocarbons (PAHs) can affect amphibians in lethal and many sublethal ways. There are many natural and anthropogenic sources of PAHs in aquatic environments. One potentially significant source is run off from surfaces of parking lots and roads that are protected with coal tar sealants. Coal tar is 50% or more PAH by wet weight and is used in emulsions to treat these surface...

[a]pyrene (BaP), a polycyclic aromatic hydrocarbon (PAH) and animal carcinogen, is used by regulators as the basis for quantitative risk estimation of PAH-containing combustion by-products (1). Is BaP an appropriate predictor of cancer risk for products of incomplete combustion? A multidose, 2-year (chronic) feeding protocol developed by the National Institute of Environmental Health Sciences i...

The National Institute for Occupational Safety and Health (NIOSH) has a partnership relationship with the asphalt paving and roofing industries and their associated unions. Our partners saw in the EHP Focus article “Paving Paradise: The Peril of Impervious Surfaces” (Frazer 2005) the statement on page A459: “Asphalt is one concern, as it contains coal tar pitch, a recognized human carcinogen .....

Figure 31 TEM micrographs of water borne polymer nanocomposite (WB PNC) emulsions.49 Figure 34 The reaction of an isocyanate with a compound containing hydroxyl functionality results in the formation of a polyurethane.. Introduction Coal tar is derived from crude coke oven tar that is a by-product of the combustion of coal in steel manufacturing. The crude coke oven tar is then refined, through...

A 56 year old aromatherapist presented with advanced renal failure following chronic coal tar creosote vapour inhalation, and a chronic tubulo-interstitial nephritis was identified on renal biopsy. Following dialysis dependence occult inhalation continued, resulting in seizures, ataxia, cognitive impairment and marked generalised cerebral atrophy. We describe for the first time a case of creoso...

Coke oven site soil was characterized to assess the particle association and availability of polycyclic aromatic hydrocarbons (PAHs). We identified various carbonaceous materials including coal, coke, pitch, and tar decanter sludge. Most of the PAHs were associated with the polymeric matrix of tar sludge or hard pitch as discrete particles, coatings on soil mineral particles, or complex aggrega...

The modern world could not exist without hydrocarbons. Virtually everything we touch is either coated with or made up primarily of hydrocarbon products. Organic chemistry originated during the Industrial Revolution, evolving largely due to advances in coal tar technology. In the coking process, bituminous (soft) coal is heated to liberate coal gas. This gas contains volatile hydrocarbons that c...

Ever since the establishment by Virchow of a n etiological theory of cancer due to irritation, cancer investigators have attempted to find a means of producing cancer experimentally by some form of irritation. The first successful results were reported by Yamagiwa and Itchikawa in 1915, using rabbits ,the ears of which were painted with coal-tar every second or third day. In 1918 Tsutsui publis...