Speaking as a chief guest at a day-long workshop on 'Kigali Amendment- the Way Forward', Dechen Tsering, Asia-Pacific regional director at the United Nations Environment Programme, told the participants that the ozone-depleting substances generally contain chlorine, fluorine, bromine, carbon, and hydrogen in varying proportions and are often described by the general term halocarbons
The lack of adequate observations of trace-gas composition, including ozone and reactive halocarbons
, in the warm pool region leaves a significant gap in our understanding of the chemistry within the TTL and the transport into stratosphere over the TWP.
His group found that noble metal nanoparticles can completely degrade halocarbons
into amorphous carbon and metal halides.
The use of contrast agents that are not gadolinium based such as fluorinated halocarbons
, deuterated water (2[H.
2]O) and halocarbons
(a group of gases containing fluorine, chlorine or bromine)(.
and other trace heteroatomic organic compounds in volcanic gases from Vulcano (Aeolian Islands, Italy).
The CO2 CH4 N2O and halocarbons
are long-lived GHS and their concentration is continuously increasing because of human activities.
Total quantity or scope: The University of East Anglia is looking to purchase a versatile field-deployable GC-Time-of-Flight mass spectrometer (GC-ToF-MS) system for ultra-trace environmental air, water and soil analysis of volatile compounds (boiling point range -140 AC to 300 AC) such as halocarbons
(including iodocarbons, bromocarbons, chlorocarbons, CFCs), sulphur gases (including dimethyl sulphide and carbonyl sulphide), oxygenated and nitrogenated hydrocarbons (including short-chain alcohols, aldehydes, and ketones, alkyl nitrates, and acetonitrile), persistent organic pollutants, primary, secondary and tertiary amines.
Ramanathan's studies on the climate warming effects of non-CO2 pollutants dates back to 1975, when he discovered the super greenhouse effect of a class of halocarbons
known as chlorofluorocarbons (CFCs).
in butter: Elevated tetrachloroethylene levels in samples obtained in close proximity to dry-cleaning establishments.
Their molecular structures include a very wide range of individual substances, such as hydrocarbons, halocarbons
and oxygenates, which are very harmful to the environment and human health.
manufacturers of residential refrigerators currently use non-chlorine containing halocarbons
(HFCs) as blowing agents for rigid polyurethane insulating foam.