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Chapter 24: Q26P (page 664)

(a) How can you improve the resolution between two closely spaced peaks in gas chromatography?

(b) What approach from (a) would be most cost effective (not involve a purchase)?

Short Answer

Expert verified

(a). In gas chromatography, to show how to improve the resolution between two closely spaced peaks.

(b). Optimizing the flow rate and temperature in gas chromatography is the most effective way to improve the resolution between the two closely spaced peaks.

Step by step solution

01

Definition of chromatography 

As a result of differential distribution of the solutes as they flow over or over a stationary liquid or solid phase, a chemical mixture transported by a liquid or gas is split into components.

02

Determine the resolution between two closely spaced peaks in gas chromatography  

(a)

  • It is necessary to discuss how to improve the resolution between two closely spaced peaks in gas chromatography.
  • In gas chromatography, to show how to improve the resolution between two closely spaced peaks.
  • In gas chromatography, there are several approaches to increase the resolution between two closely spaced peaks:
  • Increase the column's length while decreasing its diameter.
  • By altering the stationary phase of the system.
  • By maximising the pace of flow.
  • Increase the retention factor by increasing the thickness of the film as the temperature drops.
03

Determine in what approach from (a) would be most cost effective (not involve a purchase)

(b)

  • It is necessary to take the most cost-effective technique.
  • To provide the most cost-effective solution
  • Optimizing the flow rate and temperature in gas chromatography is the most effective way to improve the resolution between the two closely spaced peaks.

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Most popular questions from this chapter

Efficiency of solid-phase microextraction. Equation24-9gives the mass of analyte extracted into a solid-phase microextraction fiber as a function of the partition coefficient between the fiber coating and the solution.

(a) A commercial fiber with a100-渭尘-迟丑颈肠办coating has a film volume of6.9脳10-4mL. Suppose that the initial concentration of analyte in solution is

c0=0.10渭驳/mL(100ppb).Use a spreadsheet to prepare a graph showing the mass of analyte extracted into the fiber as a function of solution volume for partition coefficients of 10000,5000,1000and100and. Let the solution volume vary from 0to100mL.

(b) Evaluate the limit of Equation24-9asVr gets big relative to KVf. Does the extracted mass in your graph approach this limit?

(c) What percentage of the analyte fromof solution is extracted into the fiber when and whenK=100andwhenk=10000?

(a) The term that is 0 for an open tubular column has to be explained with the reason.(b) The value of B must be stated in terms of a physical property that can be measured. (c) The value ofCmust be represented in terms of a physical attribute that can be measured. (d)The minimum plate height must be expressed in terms of quantifiable physical amounts of B and C.

Why is split less injection used with purge and trap sample preparation?

(a) If retention times are 1.0 min for CH4, 12.0 min for octane, 13.0 min for unknown, and 15.0 min for nonane, find the Kovats retention index for the unknown. (b) What would be the Kovats index for the unknown if the phase ratio of the column were doubled? (c) What would be the Kovats index for the unknown if the length of the column were halved

(a) What are the advantages and disadvantages of temperature programming in gas chromatography?

(b) What is the advantage of pressure programming?

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