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Chapter 23: Q40P (page 631)

Explain how slinization reduces tailing of chromatographic peaks.

Short Answer

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Silanization creates hydroxyl groups that can form strong hydrogen bonds.

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We will explain how slinization can reduce chromatographic peak tailing in this task.

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- the process of applying alkoxysilane molecules to a surface.

- By blocking the silanol groups with nonpolar trimethylsilyl groups, this technique reduces tailing.

- It's called end-capping because silanization can cap hydroxyl groups that can create strong hydrogen bonds, which reduces chromatographic peak tailing.

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Most popular questions from this chapter

(a) Write the meaning of the retention factor,k, in terms of time spent by solute in each phase. (b) Write an expression in terms of kfor the fraction of time spent by a solute molecule in the mobile phase. (c) The retention ratio in chromatography is defined as R=timeforsolventtimeforsolutetopassthroughcolumn=tmtrShow that is related to the retention factor by the equation R=1/k+1

An open tubular column has an inner diameter of 207μmand the thickness of the stationary phase on the inner wall is 0.50μm. Unretained solute passes through in 63s and a particular solute emerges in 433s . Find the partition coefficient for this solute and find the fraction of time spent in the stationary phase.

Solvent occupies15% of the volume of a chromatography column whose inner diameter is 3mm. If the volume flow rate is 0.2mL / min, find the linear velocity.

Two compounds with partition coefficients of 15 and 18 are to be

separated on a column with Vmi/Vs=3.0and localid="1654950413291" tm=1.0min. Calculate the

number of theoretical plates needed to produce a resolution of 1.5 .

The solute in Problem 23 - 8 is initially dissolved in 80.0 mL of water. It is then extracted six times with 10.0mL portions of chloroform. Find the fraction of solute remaining in the aqueous phase.
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