Sentences with word «dichloromethane»

Columbia Engineering's compact, chip - scale dual comb spectrometer was able to measure a broad spectrum of dichloromethane in just 20 microseconds (there are 1,000,000 microseconds in one second), a task that would have taken at least several seconds with conventional spectrometers.

And one is direct contact with dichloromethane or ethyl acetate to fairly harmful compounds and chemicals.

At present, the long - term recovery of the Ozone Layer from the effects of CFCs is still on track, but the presence of increasing dichloromethane will add some uncertainty to our future predictions of ozone and climate.»

The droplets made from dichloromethane traveled at faster speeds — perhaps because acid was released onto their surfaces at a higher rate — and thus sometimes veered onto the wrong paths, but they always reverted rapidly to the best ways out, the team reports online 11 January in the Journal of the American Chemical Society.

Measurements of dichloromethane in the atmosphere over the past two decades, provided by scientists from the National Oceanic and Atmospheric Administration (NOAA) in the United States, were also analysed.

The findings, published in Nature Communications, suggest that a previously ignored chemical called dichloromethane may now be contributing to ozone depletion and should be looked at to improve future ozone predictions.

If dichloromethane concentrations stay at current levels, the delay in recovery would be only 5 years.

Study co-author Dr Stephen Montzka from the NOAA added: «The increases observed for dichloromethane from our measurements are striking and unexpected; concentrations had been decreasing slowly in the late 1990s, but since the early 2000s have increased by about a factor of two at sites throughout the globe.»

Using this dual comb, Lipson's and Gaeta's groups demonstrated real - time spectroscopy of the chemical dichloromethane at very high speeds, over a broad frequency range.

Dr Ryan Hossaini of Lancaster University and colleagues use simulations with a global chemical transport model to examine the sensitivity of future stratospheric chlorine and ozone levels to sustained dichloromethane growth.

Their projections show that continued dichloromethane increases at the average trend observed from 2004 - 2014 would delay ozone recovery over Antarctica by 30 years.

«We should be mindful to the growing threat to stratospheric ozone posed by dichloromethane and similar chemicals not controlled by the Montreal Protocol.

«Our estimates suggest that China may be responsible for around 50 - 60 % of current global emissions [of dichloromethane], with other Asian countries, including India, likely to be significant emitters as well,» says Oram.

The amount of this substance in the atmosphere decreased in the 1990s and early 2000s, but over the past decade dichloromethane became approximately 60 % more abundant.

The maze runners, placed at the entrance of the labyrinths, were millimeter - wide droplets of either mineral oil or the organic solvent dichloromethane, both loaded with a weak acid and red dye.

«Because of its very short - lived nature, and the unlikely scenario of the emissions sustaining a high growth rate, it's highly unlikely dichloromethane would have a major impact on the ozone layer,» said Liang.

Dichloromethane breaks down in the atmosphere in about four months and its harmful degradation products are completely removed from the atmosphere within a few years of their emissions.

These new ozone - busters include dichloromethane (DCM), a common and cheap paint stripper, also used in foam - blowing agents and, ironically, in the manufacture of «ozone - friendly» alternatives to CFCs.

One of these substances called dichloromethane has come under recent scrutiny because of its increasing emission rates over the last few years.

Study co-author Dr Stephen Montzka from the NOAA added: «The increases observed for dichloromethane are striking and unexpected; concentrations had been decreasing slowly in the late 1990s, but since then have increased by about a factor of two at sites throughout the globe.»

At present, the long - term recovery of the Ozone Layer from the effects of CFCs is still on track, but the presence of increasing dichloromethane will lead to uncertainty in our future predictions of ozone and climate.»

«While ozone depletion from dichloromethane is currently quite modest, it is uncertain how the amount of this gas in the atmosphere will change in the future.

However, atmospheric concentrations of dichloromethane — a short - lived, ozone - depleting substance not regulated by the Montreal Protocol — have risen in recent years and could be contributing to ozone loss.

Study lead author Dr Ryan Hossaini, from the Lancaster Environment Centre at Lancaster University, said: «Dichloromethane is a human - made ozone - depleting chemical that has a range of industrial applications.

Although the future trajectory of dichloromethane is uncertain, without any regulations on emissions, it is likely concentrations will fall somewhere in between the ranges presented here.

Unlike CFCs and similar long - lived gases that are responsible for most ozone depletion, dichloromethane has a short atmospheric lifetime so has not been controlled by the Montreal Protocol.

On the broader implications of the findings and outlook, Dr Hossaini said: «Ozone is an important climate gas and changes to its abundance, including due to the increasing influence of dichloromethane, could be relevant for refining future climate predictions.

These were toluene, acetaldehyde and dichloromethane.

The chemical in question is called dichloromethane (CH2Cl2).

However, it could be partly due to the fact that dichloromethane is used in the manufacturing process of some HFCs, the «ozone - friendly» gases which were developed to replace CFCs.

These measurements revealed a rapid increase in atmospheric concentrations of dichloromethane, a man - made VSLS used in a range of industrial processes.

The team set out to measure air pollution in East Asia to figure out where the increase in dichloromethane was coming from and if it could affect the ozone layer.

Dichloromethane was found in large amounts, and so was 1,2 - dichloroethane, an ozone - depleting substance used to make PVC.

One of the new threats is dichloromethane, a substance with uses varying from paint stripping to agricultural fumigation and the production of pharmaceuticals.

A widely used organic solvent, dichloromethane is abundant in industrial areas as well as in wetland emissions.

While its production, use and destruction are accurately monitored and reported, it also forms as a by - product in the production lines of chloroform and dichloromethane.

PEG is soluble in water, methanol, ethanol, acetonitrile, benzene, and dichloromethane, and is insoluble in diethyl ether and hexane.