【Daily Question】Chemical Analysis Edition 2019.3.31
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This post was last edited by zjp on 2019-3-31 07:38. Multiple-choice question: In atomic absorption spectroscopy analysis, in order to prevent backfire, what principles must be followed regarding the switching on and off of the fuel gas and the oxidizing gas when igniting and extinguishing various flames? A. Turn on the auxiliary gas first, then turn off the auxiliary gas. B. Turn on the gas first, then turn off the gas. C. Turn on the auxiliary gas later, then turn off the auxiliary gas. D. Turn on the gas later, then turn off the gas. AD
In atomic absorption spectroscopy, in order to prevent backfire, the principles that must be followed regarding the switching on and off of the fuel gas and the oxidizing gas when igniting and extinguishing various flames are (). A. Turn on the auxiliary gas first, then turn it off. D. Turn on the main gas later, then turn it off first