Sentences with phrase «organic chemical compounds in»

Chemical oxygen demand (COD)- The quantity of oxygen required for the complete oxidation of organic chemical compounds in water; used as a measure of the level of organic pollutants in natural and waste waters.

Not exact matches

Employed on waste water streams, such technologies can achieve up to 99 % COD removal in some types of wastewater (COD, chemical oxygen demand, indicating the amount of organic compounds in water).

Organic Crib Mattress: As the name implies, such mattresses are made of organic materials, and absent of any chemical and industrial compounds — flame retardants, PBDE, vinyl, polyurethane foam, latex, etc., in the fear of them causing unwanted harm to their occupants.

A study published in the Archives of Environmental Health in 1999, found that disposable diapers release chemicals called volatile organic compounds (VOCs), including toluene, ethylbenzene, xylene and dipentene.

Researchers tested the the foam padding in crib mattresses, and found they release significant amounts of volatile organic compounds (VOCs), potentially harmful chemicals also found in household items such as cleaners and scented sprays.

The village water system in Hoosick Falls was not required to test for the organic and chemical compounds listed by the EPA.

In the 5 June issue of the Journal of the American Chemical Society, a team reports that it has carried out a battery of common organic chemistry reactions using solid compounds, without first dissolving them in the usual solventIn the 5 June issue of the Journal of the American Chemical Society, a team reports that it has carried out a battery of common organic chemistry reactions using solid compounds, without first dissolving them in the usual solventin the usual solvents.

Three chemists will share the award for developing chemical reactions that enable the building of complex organic compounds with wide applications in medicine, industry and agriculture

Harmful gaseous pollutants in the form of volatile organic compounds are often released into the air when chemicals are used, for example in cleaning products.

The researchers, who released their findings in the current issue of the Journal of Functional Foods, suggest that cruciferous vegetables — such as broccoli, brussels sprouts and cabbage — contain an organic chemical compound called indole glucosinolates, which breaks down into other compounds, including indolocarbazole — ICZ — in the stomach.

HER PROJECT: Stabilizing a fluorescent compound WHAT LED TO THE PROJECT: As the daughter of John Zoltewicz, a longtime professor of organic chemistry at the University of Florida in Gainesville, Susie Zoltewicz grew up hearing about chemical experiments.

In the atmosphere today, particle formation is dominated almost everywhere by mechanisms where at least three chemical components must come together: apart from the two basic substances, i.e. sulphuric acid and water, these are either ammonia or specific organic compounds such as oxidation products from terpenes.

The organic (carbon - containing) compounds they studied in that patch of Colorado forest play a key role in atmospheric chemical processes that can affect air quality, the health of the ecosystem, and the climate itself.

In a new study published in the Proceedings of the National Academy of Sciences (PNAS), researchers from Innsbruck, Austria, present the world's first chemical fingerprint of urban emission sources of volatile organic compounds (VOCsIn a new study published in the Proceedings of the National Academy of Sciences (PNAS), researchers from Innsbruck, Austria, present the world's first chemical fingerprint of urban emission sources of volatile organic compounds (VOCsin the Proceedings of the National Academy of Sciences (PNAS), researchers from Innsbruck, Austria, present the world's first chemical fingerprint of urban emission sources of volatile organic compounds (VOCs).

Biochemist Lars Thelander at the announcement from the Royal Swedish Academy of Sciences: «Palladium - catalyzed cross-coupling has made it possible to synthesize carbon based molecules, for example, new medicines, agricultural chemicals and organic compounds used in the electronics industry.»

If you've ever set foot in a nail salon, you've probably smelled volatile organic compounds, chemicals that dissipate rapidly into the surrounding air like acetone and formaldehyde.

Tomato plants produce repellent chemicals called volatile organic compounds in response to herbivore attacks.

They also correlated the amount of energy found in the sample to its chemical oxygen demand (COD), a commonly used indirect measurement of dissolved organic compounds.

Chelators are organic compounds that bind metal ions, and in this case, they also generate «hydroxyl radicals» to break down wood and produce simple building - block chemicals.

Like vehicles and power plants, trees emit airborne chemicals called volatile organic compounds (VOCs), which in the presence of sunlight react with nitrogen oxides in vehicle fumes to form ozone, one of the components in smog that makes it a health threat.

One of the Holy Grails in chemical science has been to find the late - stage, site - specific incorporation of a halogen atom into a complex natural product by replacing an sp ³ C - H bond (one of the most inert chemical bonds known in an organic compound) with a C - X bond (X = halogen).

Chemists at The University of Texas at Arlington have devised a safer, more environmentally friendly, less expensive and more efficient water - based system for the synthesis of organic compounds typically used in pharmaceuticals, agrochemicals, cosmetics, plastics, textiles and household chemicals.

In order to investigate the formation of the extremely low - volatility organic compounds the team has studied five abundant biogenic organic compounds with different chemical structures.

As crude oil burns it releases many toxic chemicals, including lead, carbon monoxide, polycyclic aromatic hydrocarbons and volatile organic compounds, says Bin Jalaludin at the University of New South Wales in Australia.

However, the types of organic compounds found in plant matter — dominated by aromatic hydrocarbons — underwent some chemical changes, but remained relatively resistant to impact pressures.

«Light splits chemicals in the atmosphere, creating more complex organic compounds that make the haze,» said Charnay.

Dirty laundry smells bad because of certain chemicals called volatile organic compounds, which can't always be washed out on an eco-friendly 20 ˚C cycle, according to a new study in the Journal of Chromatography A.

The samples revealed that the ratios among certain «volatile organic compounds» (chemicals that can be a source of scents and odors) in the atmosphere increase or decrease along specific directions.

The sensor works by measuring levels of chemicals called volatile organic compounds present in exhaled breath.

They also used chemical analysis of organic compounds in the scales to infer the dinosaur's pigmentation pattern.

The PNNL study measured how, in the atmosphere, these aerosols interact with and mix with other volatile or semi-volatile organic compounds, the carbon - centric chemicals that evaporate from both natural and human - made sources.

There is growing interest in and legitimization of theories that the chemical and thermal conditions found in some vent waters may permit the synthesis of organic compounds.

In one on - going project, funded by Harvard University's Climate Change Solutions Fund (CCSF), Martin and his team are mapping and monitoring the unique chemical signals emitted by trees known as volatile organic compounds (VOCs).

New volatile organic compounds used in construction and industry have now been recognised, along with other agents, such as sulphites, chlorates, isocyanates and many other chemicals already known to be potentially toxic, as causes of chronic asthma.

ORGANIC COMPOUNDS Organic compounds, any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or COMPOUNDS Organic compounds, any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or compounds, any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen.

Drones launch from a tower in the Amazon rainforest to map and monitor the unique chemical signals emitted by trees known as volatile organic compounds (VOCs).

However, the types of organic compounds found in plant matter — dominated by aromatic hydrocarbons - underwent some chemical changes, but remained relatively resistant to impact pressures.

In a 2008 study, vinyl curtains were found to release 108 volatile organic compounds (VOCs), chemicals that become gaseous at room temperature, potentially triggering headaches, nausea, dizziness and irritated eyes and throat.

What happens to organic undesirables like added hormones and antibiotics; do new and bad chemical species appear; do fat - soluble compounds follow the bones and fat into the trash; can I ameliorate the undesirables in poultry knowing poultry has problems and will stay in my diet nonetheless?

[12] An organic chemical compound (or related set of compounds) is called a vitamin when it can not be synthesized in sufficient quantities by an organism, and must be obtained from the diet.

«My instinct is that it only makes sense to prevent children's exposure to chemicals known to affect the nervous system, and those include pesticides, solvents, many volatile organic compounds, metals, PCBs, and thousands of other poorly tested synthetic chemicals now in commerce.

Even some traditional cleaning chemicals are high in volatile organic compounds (VOCs) which, when evaporated in the confines of the nacelle or hub, can cause respiratory irritation and trigger asthmatic attacks.

Chemical contaminants such as persistent organic pollutants, toxic metals (e.g., Hg, Cd, Pb, Ni), radioactive compounds, pesticides, herbicides, and pharmaceuticals are also accumulating in deep - sea sediments [252].

Recalling the concern reflected in the outcome document of the United Nations Conference on Sustainable Development, entitled «The future we want», 1 that the health of oceans and marine biodiversity are negatively affected by marine pollution, including marine debris, especially plastic, persistent organic pollutants, heavy metals and nitrogen - based compounds, from numerous marine and land - based sources, and the commitment to take action to significantly reduce the incidence and impacts of such pollution on marine ecosystems, Noting the international action being taken to promote the sound management of chemicals throughout their life cycle and waste in ways that lead to the prevention and minimization of significant adverse effects on human health and the environment, Recalling the Manila Declaration on Furthering the Implementation of the Global Programme of Action for the Protection of the Marine Environment from Land - based Activities adopted by the Third Intergovernmental Review Meeting on the Implementation of the Global Programme of Action for the Protection of the Marine Environment from Land - based Activities, which highlighted the relevance of the Honolulu Strategy and the Honolulu Commitment and recommended the establishment of a global partnership on marine litter, Taking note of the decisions adopted by the eleventh Conference of the Parties to the Convention on Biological Diversity on addressing the impacts of marine debris on marine and coastal biodiversity, Recalling that the General Assembly declared 2014 the International Year of Small Island Developing States and that such States have identified waste management among their priorities for action, Noting with concern the serious impact which marine litter, including plastics stemming from land and sea - based sources, can have on the marine environment, marine ecosystem services, marine natural resources, fisheries, tourism and the economy, as well as the potential risks to human health; 1.

Ozone is an odorless gas that is not directly emitted into the air but is created by chemical reactions between nitrogen oxides (NOx) and volatile organic compounds (VOC)-- which occur naturally but are also produced from the burning of fossil fuels and are released in the process of drilling for oil and natural gas.

Instead it is created in a photo - chemical reaction between nitrogen oxides and volatile organic compounds.

An EPA study of chemicals in septic tanks found toluene, methylene chloride, benzene, chloroform, and other volatile synthetic organic compounds related to home chemical use, many of them cancer - causing.

In addition to methane emissions, natural gas sector operations and infrastructure represent a significant source of CO2; volatile organic compounds (VOCs), which are chemicals that contribute to ground - level ozone and smog; and hazardous air pollutants (HAPs).

They honed in on the use of phosphines, which, for the scientifically challenged, are organic chemical compounds containing a phosphorous atom bound to the hydrogen or to the carbon of an organic group, synthesised with functional groups attached.

Preparing test solutions, compounds and reagents for the purpose of laboratory testing, and analyzing both organic and inorganic compounds to determine their chemical properties are all in a day's work for me.