Preparation method for ethyl nitrite standard air

Abstract

The invention provides a preparation method for ethyl nitrite standard air. The method comprises the following steps of: a 1, inducing inert gas into a clean sealed flexible container; a 2, injecting ethyl nitrite standard liquid into a clean sealed ampoule bottle through a micro-chromatograph sample-injecting needle; a 3, placing the ampoule bottle in a sealed container 2, and slowly flushing the container 2 by using the inert gas in the flexible container so as to exhaust the air in the container 2; a 4, pumping the container 2 until the pressure in the container 2 is negative, and sealing the container 2; a 5, shaking the container 2 forcefully to smash the ampoule bottle, after the ethyl nitrite is completely volatilized, continuously supplementing the inert gas into the container 2, and after the air pressure in the container 2 is in balance with the external atmosphere pressure, sealing the container 2 again; and a 6, shaking the container 2 slightly to fully mix air so as to prepare the ethyl nitrite standard air. The standard air prepared by the method is purer and more accurate and is more quickly prepared. The method is usually applied to fields, such as environment and medicine.

Description

【Technical field】 [0001] The invention relates to the field of laboratory preparation of standard gas, in particular to a preparation method of a small amount of ethyl nitrite standard gas. 【Background technique】 [0002] Ethyl nitrite is a colorless to pale yellow clear liquid with a special odor and a sweet taste. Its boiling point is 17.2°C and it is very volatile. Insoluble in water, soluble in ethanol and ether. Its chemical properties are unstable, and it is easy to dissociate and release nitric oxide gas, which is easy to be oxidized. It can be used as a chemical raw material in the chemical industry and as a nitric oxide gas donor in the medical field. Gas chromatographic analysis is commonly used in laboratories to detect ethyl nitrite gas, but it is difficult to quantitatively analyze it due to the lack of standard gas of ethyl nitrite. [0003] For the detection of gas, in the absence of standard products, the static gas distribution method is usually used at p...

AI Technical Summary

Problems solved by technology

The static gas distribution method usually uses clean air as the mixed gas, but when the static gas distribution method is used, ethyl nitrite is easily oxidized in the air containing oxygen, and the gas formed is inaccurate.

At present, the method for preparing a small amount of ethyl nitrite standard gas in the laboratory is still blank

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