Sentences with phrase «pah compounds»

According to two studies (Managing Coal Combustion Residues in Mines, Committee on Mine Placement of Coal Combustion Wastes, National Research Council of the National Academies, 2006, and Human and Ecological Risk Assessment of Coal Combustion Wastes, RTI, Research Triangle Park, August 6, 2007, prepared for the US EPA): «Toxic constituents include arsenic, beryllium, boron, cadmium, chromium, chromium VI, cobalt, lead, manganese, mercury, molybdenum, selenium, strontium, thallium, and vanadium, along with dioxins and PAH compounds.»

In laboratory scale tests, the best results showed 96 % of PAH compounds and 64 % of the dioxins were broken down in three months.

Several PAH compounds that may be more toxic than those regulated by the authorities, have been detected in tunnel wash water.

Not exact matches

Beer marinades are actually an effective way of reducing levels of polycyclic aromatic hydrocarbons (PAHs), a group of carcinogenic compounds that form on grilled meat when fats and juices interact with an open flame, finds a new study in the Journal of Agricultural and Food Chemistry.

In fact, the E.P.A. says the lake that Martens bobbed around in for about ten minutes while wearing a life jacket contains the following substances: «mercury, polychlorinated biphenyls (PCBs); pesticides; creosotes; heavy metals including lead, cobalt, and mercury; polycyclic aromatic hydrocarbons (PAHs); and volatile organic compounds (VOCs) such as chlorobenzene.»

Among the greatest concerns is that compounds in oil called polycyclic aromatic hydrocarbons (PAHs) could have long - term sublethal effects on marine organisms that were at the peak of their spawning season when the spill began.

Mathur, who is with Johann Haltermann Ltd., in Houston, said those include PAHs — polycyclic aromatic compounds that exist naturally in the crude oil that becomes gasoline have been largely responsible for particulate matter emissions.

The parent compounds involved in this research are polycyclic aromatic hydrocarbons, or PAHs, formed naturally as the result of almost any type of combustion, from a wood stove to an automobile engine, cigarette or a coal - fired power plant.

They are generally grouped as PAHs, however, and are all aromatic compounds.

The toxic compounds in oil vary, but the most worrisome are polycyclic aromatic hydrocarbons (PAHs), such as napthalenes, benzene, toluene and xylenes.

Polycyclic aromatic hydrocarbons (PAHs) are a class of carcinogenic organic compounds that are ubiquitous in the environment.

To determine the levels of PAHs in soil and sediment, researchers first extract the compounds from a sample, a step that can take up to 16 hours and requires large amounts of hazardous solvents.

PAHs, the second type of compound, are formed when juices from meat drip onto coals or other hot surfaces and create smoke.

For one, fumes released from overheating some cooking oils may contain compounds known as heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs), which increase cancer risk, says Dr. Hensrud.

Just like the previous compound, higher levels of PAHs can get produced during meat preparation at high temperatures.

In particular, common references to PAHs in relation to human cancer risk have been loose and inconsistent with the scientific understanding of human cancer risk from this class of compounds.

Noxious compounds like volatile organic compounds (VOCs), polycyclic aromatic hyrdrocarbons (PAHs), and toxic heavy metals combine to form fine dust that inflames the lungs and invades the bloodstream, liver, even the brain when inhaled.

These sealers, which contain high levels of a harmful carcinogenic compound known as polycyclic aromatic hydrocarbon (PAH), are believed to pollute our ground water.