Ammonia (NH3) is an important component of the nitrogen (N) cycle in terrestrial ecosystems and is a significant atmospheric pollutant. Results from studies of ammonia emissions from semi-arid grasslands have been infrequently reported although these emissions may be increasing rapidly with a subsequent increase in atmospheric N deposition. Moreover, whether N deposition regimes (fertilization ...

The rotational spectra of four isotopologues of the adduct C2F3Cl-NH3 show that NH3 is bound to the partner molecule through a (N)lone-pair···π interaction. Ammonia is located in proximity to the C2 atom (the one linked to two fluorine atoms), with the C2···N distance = 2.987(2) Å. The nuclear hyperfine structure due to the quadrupole coupling effects of (35)Cl/(37)Cl and (14)N nuclei has been ...

Ammonia is a natural compound, as well as a manufactured compound. In nature, most ammonia probably comes from decomposing animal excreta, with the decay of organic materials from plants, dead animals, and the like also contributing significant amounts. It is also exhaled by animals. Production of fixed nitrogen (NH3) by plants and microorganisms is estimated at 90 to 130 metric tons annually. ...

Ammonia emission inventory for 1990 and 1995 as well as scenarios up to 2030 are presented for China. Emissions are estimated on a provincial level using a Regional Air pollution INformation and Simulation (RAINS) model that was developed at IIASA. Total emissions in China are estimated at 9.7 and 11.7 million tons NH3 in 1990 and 1995 and are forecasted to increase to nearly 20 million tons NH...

A Ru-based half sandwich complex used in amine and alcohol racemization reactions was found to be active in the splitting of secondary amines to primary amines using NH3. Conversions up to 80% along with very high selectivities were achieved. However, after about 80% conversion the catalyst lost activity. Similar to Shvo's catalyst, the complex might deactivate under the influence of ammonia. I...

Vanadium-based catalysts are used in many technological processes, among which the removal of nitrogen oxides (NOx) from waste gases is one of the most important. The chemical reaction responsible for this selective catalytic reaction (SCR) is based on the reduction of NOx molecules to N2, and a possible reductant in this case is pre-adsorbed NH3. In this paper, NH3 adsorption on Brønsted OH ac...

Modified natural zeolites in the Na-form (clinoptilolite tuff of Aydag and mordenite Chananab deposits Azerbaijan) were studied order to extract cations transition heavy metals water industrial liquid waste. The equilibrium kinetic characteristics sorption process under static dynamic conditions have been studied. Distribution isotherms exchange ions between Na forms with chloride (Ni2+, Co2+, ...

Krogh (1939) first proposed that freshwater organisms extract needed Na+ in exchange for NHJ to maintain near-electroneutrality across the skin or gills. Maetz & Garcia-Romeu (1964) provided an indirect demonstration of Na/NH^" exchange in the goldfish {Carassius auratus) by showing that injected NH4C1 stimulated Na + uptake, but addition of NH4C1 to the freshwater inhibited Na + uptake. They p...

Nanocrystalline semiconducting thin films of copper sulphide (Cu2S) were deposited by novel chemical route using aqueous solution of 0.1 M copper chloride, 0.05 M thiourea, complexing agent 10% aqueous ammonia (NH3) and hydrazine hydrate. The characterization and gas sensitivity of as deposited Cu2S thin film sensor have been investigated. The as deposited Cu2S thin films were observed to be ve...

Ultraviolet spectra of the northern and southern hemispheres of Jupiter taken with the Hubble Space Telescope Faint Object Spectrograph (FOS) in May 1992 and June 1993 have been used to derive the altitude profiles of NH3 in the vicinity of the tropopause. For a given pressure level, it is shown that the vertical profile of ammonia varies with latitude and the atmospheric feature being observed...