Apparatus for determining small amounts of nitrogen

Details Apparatus for determining small amounts of nitrogen Apparatus for determining small amounts of nitrogen

1976-07-30

1978-03-28

Tung, T.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204195R, 204 1T, 23230R, 23230M, 23253R, G01N 2744

Patent

active

040813452

ABSTRACT:
The nitrogen content of a substance is determined by digesting the substa in a sealed container at superatmospheric pressure in a liquid acid medium until the nitrogen is converted to ammonium ions, the medium is alkalinized, and the ammonia liberated thereby is driven from the alkalinized medium into an acidic aqueous medium by steam distillation in a closed system in which the steam used is generated from the acidic aqueous medium. The latter then is adjusted to a weakly alkaline pH, and the ammonia present is oxidized to nitrogen by hypobromite ions electrolytically generated from bromide ions in the adjusted solution. The amount of current consumed is determined as a measure of the nitrogen originally present.

REFERENCES:
patent: 3131133 (1964-04-01), Barendrecht
patent: 3361661 (1968-01-01), Schulze
patent: 3461042 (1969-08-01), Martin et al.
patent: 3497322 (1970-02-01), Boys
patent: 3580832 (1971-05-01), Rhodes
patent: 3616273 (1971-10-01), Oita
patent: 3716334 (1973-02-01), Pont

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