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Gas chromatography was used to analyse for residues of toxic solvents, including benzene and 1,2-dichloroethane (DCE), in a pharmaceutical preparation. The following conditions were used:
Column: 30 m long capillary with polysiloxane stationary phase
Carrier gas: He at 35 cm s–1 constant flow
Oven program: 40 °C at t = 0, increasing at 10 °C min–1 to 240 °C at t = 20 min. Detector: flame ionisation (FID)
Benzene eluted with retention time = 11.5 min, peak width = 0.26 min 1,2-dichloroethane (DCE) eluted with retention time = 11.8 min, peak width = 0.28 min
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(i) What are the strengths and limitations of the flame ionisation detector in this application, compared with other possible methods of detection?
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(ii) What is the resolution, RS, for the separation of benzene and DCE on this column?
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(iii) Suggest two ways by which the resolution of benzene and DCE might be improved. Explain your choices.
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