Ammonia oxidation in laboratory liquid batch cultures of autotrophic ammonia oxidizers rarely occurs at pH values less than 7, due to ionization of ammonia and the requirement for ammonium transport rather than diffusion of ammonia. Nevertheless, there is strong evidence for autotrophic nitrification in acid soils, which may be carried out by ammonia oxidizers capable of using urea as a source ...

Ammonia detection technologies are very important in environment monitoring. However, most existing technologies are complex and expensive, which limit the useful range of real-time application. Here, we propose a highly sensitive and selective optical sensor for detection of ammonia (NH3) based on liquid crystals (LCs). This optical sensor is realized through the competitive binding between am...

Tank liquid ammonia (Ohio Chemical and Manufacturing Company) was distilled from sodium shavings into a tube of about 120 cc. volume. This was equipped with a thermocouple well, inlet and outlet side arms protected with calcium chloride and phosphorus pentoxide drying towers, and a standard taper cap containing a mercury seal stirrer. A current of dry nitrogen could be passed through the tube, ...

A pilot-scale reactor, consisting of a set of two-stage-in-series biotrickling filters, an influent gas supply system and a liquid recirculation system, was utilized to treat ammonia in an airstream. Each stage of the biotrickling filter was constructed from a 20 cm × 200 cm (inner diameter × height) acrylic column packed with cokes (average diameter = 3.0 cm, specific area = 150 m/m) of 125 cm...

Reaction of (ClMe2SiC5H4)2ZrCl2 (1) with K (Na) in liquid ammonia/toluene at -78 °C gave the ansa-zirconocene dihydride [{HN(SiMe2C5H4)2Zr(μH)H}2] (3). Alternatively, treatment of (MeC5H4)2ZrCl2 (2) with K (Na) or NaNH2 in liquid ammonia/toluene produced the zirconium cluster [{(MeC5H4)Zr}5(μ5-N)(μ3-NH)4(μ-NH2)4] (4). The reaction of 2 with NaNH2 in THF led also to the formation of 4.