Principle:
The sample containing Nitrogen and Oxygen present as nitride and oxide has well defined melting point, it is possible to separate one from another by fusion at a corresponding furnace temperature. The gradually increases furnace temperature at a programmed rate (ramping). Nitrides and oxides are then separately determined in the same order as

their melting point. Nitrogen and CO are carried by Helium gas, the CO is oxidised to Carbon dioxide and is selectively measured by an infra-red cell Nitrogen is measured by thermal conductivity.

The main reaction is carbothermic reduction which can be expressed as:

M + dissolved gases (aO2+bH2+cN2) + combined gases (Mox+Mhy+MNz) + C
(2a+x)CO + (b+0.5y)H2 + (c+0.5z)N2 + MC + M

Application..
Total Nitrogen and Oxygen are simultaneously determined in ferrous and non-ferrous metals.

Detector of Nitrogen and Carbon dioxide in steel, molybdenium and Nickel alloy.

Sample quantity: 1.0 g

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