The following precaution is essential if we want retention time as means of peak

Question

The following precaution is essential if we want retention time as means of peak characterization in chromatographic separation 14. A. A column should be changed after each analysis B. Extremely high purity carrier gas should be employed C. Column temperature should remain constant D. E. Cand D Detector temperature should remain constant 15. The isothermal gas chromatographic separation of a mixture of three compounds produced retention times of 0.95 min, 1.15 min, and 10.40 min. The best means to shorten th analysis time without sacrifice of resolution would be to use (A) (B) (C) (D) (E) a longer chromatographic column a column operated at a higher isothermal temperature temperature programming of the column increased flow rate of the mobile phase in the column C and D

Explanation / Answer

14) (E) C and D is the answer.

Column temperature should remain constant; and detector temperature should remain constant.

15) (E) C and D is answer.

Temperature programming of the column; increased flow rate of the mobile phase in the column.

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