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The total nitrogen in naphtha range samples and other trace nitrogen containing liquid hydrocarbons can be determined by four different ASTM standard methods: ASTM D4629, D5762, D6069 and D7184.
D4629 and D5762 are performed at atmospheric pressure. ASTM D6069 and D7184 are performed under reduced pressure and, as such, require a trace nitrogen kit comprised of a vacuum pump, a needle valve for pressure control and a restrictor to regulate the ozone concentration in the reaction chamber that would affect the sensitivity of the measurement. This application utilizes the Standard Addition Method.
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