The Lunge nitrometer

The apparatus for the determination of active hydrogen is shown in Fig. 45. The Lunge nitrometer a, of which the levelling bulb is not shown in the sketch, is filled with saturated brine. By means of the short calcium chloride tube 6, interposed between the reaction vessel and the nitrometer, the access of water vapour to that vessel is prevented. For the determination weigh accurately, according to... 

The Lunge nitrometer is so designed that the nitrate or nitric ester is dissolved first in concentrated sulfuric acid and the solution, without entrained gas, is afterwards admitted to the re-... 

The Lunge nitrometer provides a simple and very useful means for controlling nitrations carried out in concentrated sulfuric acid solution. Its usefulness for the determination of the oxyacids of nitrogen, especially nitric and nitrous acids, depends on the fact that these acids (and their salts and esters) are quantitatively and rapidly reduced to NO by metallic mercury in the presence of concentrated sulfuric acid, even at ordinary temperatures, according to the reaction ... 

It was invented by lunge in 1890 under the name gasvolumeter (Ref 1). Ten years later, in the USA, it was modified and improved by F.I. duPont and described by Pitman as the duPont Nitrometer (Ref 2). At present, both macro and semi-micro nitrometers are in use, the latter being designed by Elving and Me Elroy (Ref 7)... 

Determine the nitrogen content by duPont-Lunge nitrometer as described in Spec JAN-N-246 and in Vol 1 of Encycl, pp A373 to A376. 

Standardization of Nitrometer. Standardization of the DuPont 5-part form of Lunge nitrometer shall be made by Method 209.3 of Standard MIL-STD-286. A detailed description of the method as was conducted during WW1I... 

In the laboratory sulphuric acid can be freed from nitric acid by agitation with mercury in a Lunge nitrometer.9... 

Lunge nitrometer, the consumption of the nitric acid can easily be followed and the end of the reaction determined. 

Determination of Nitrogen by Lunge Nitrometer.—The determination of the percentage of nitrogen in a sample of gim-cotton or collodion is perhaps of more value, and affords a better idea of its purity and... 

Lunge, Georg. (1839—1923). Ger chemist, noted for work on technological analytical methods. Inventor of the nitrometer (See below) author of numerous publications, among them (in collaboration with E. Berl), Chemisch-technische Untersuchungsmethoden , a classic work on technical analysis Ref Hackh s (1944), 501-R... 

---