2. Analysis of a Mixture of Permanent Gases: Neon Ne- 20.18, Argon Ar 39.95 Oxyg
ID: 1045495 • Letter: 2
Question
2. Analysis of a Mixture of Permanent Gases: Neon Ne- 20.18, Argon Ar 39.95 Oxygen 02 31.99, Nitrogen N2 28 Methane = CH4 ( 16.01 ), Carbon monoxide (CO) Indicate the approximate chromatographic conditions (a) Separation mode (gas-solid chromatography, gas-liquid chromatography, reversed phase, normal phase, ion chromatography, gel permeation). (packed or open) (b) Chemical nature of the column: (i) Column back bone (silica or polymer backbone) (ii) Name of the functional group (ligand) attached to the column backbone, and its polarity of the functional group (weakly polar, intermediate polarity and strongly polar) (c) Choice of mobile phase (identify the chemical name and composition (if need) of the flowing gas or liquid mobile phase) d) Isocratic/Isothermal or gradient (if gradient is selected suggest a suitable solvent gradient, if temperature programming is selected suggest a suitable start and end temperature conditions) (e) A suitable detector with specification on the mode area normalization method, standard addition method) of quantitation (external standard, internal standard () Expected elution order (increase retention with justification)Explanation / Answer
Q2.
a) Separation Mode: Gas-Liquid Chromatography (packed). This is used because the permanent gases mixture has quite a variation in molecular weights.
b) i) Column Backbone: Polymer backbone
ii) Ligand is ethenylethylbenzene with intermediate polarity
c) Choice of mobile phase: A mixture of Nitrogen and Helium.
The components will be eluted in the order of their molecular weights. More heavy component will be eluted first. So CO carbon Monoxide will be eluted first.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.