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Chapter 26: Q12P (page 747)

(a) State the purpose of the separator and suppressor in suppressed ion chromatography. For cation chromatography, why is the suppressor an anion-exchange membrane?

Short Answer

Expert verified

The solution to the above questions are:

The suppressed ion chromatography os suitable for anion analysis.
For cation chromatography, the suppressor replaces anions from eluent.

Step by step solution

01

Explanation of suppressed ion chromatography being the suitable for anion analysis:

The suppressor causes the reduction in the conductivity of the eluent by an exchange in the sample counter ions and eluent with ions derived by a suppressor.
It changes cations to hydrogen ions with higher conductivity $\to H_{2} O$
It neutralizes the eluent
Ions are separated with ion exchange process via separator column.

02

Step2:For cation Chromatography:

In this case the suppressor is an anion – exchange membrane because the suppressor replaces anions from eluent with hydroxyl ions via anion-exchange membrane

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Most popular questions from this chapter

The system in Figure 26-7 can be adapted to produce the strong acid eluent methane sulfonic acid $({CH}_{3} {SO}_{3}^{-} H^{+})$ . For this purpose, the polarity of the electrodes is reversed and the reservoir contains ${NH}_{4}^{+} {CH}_{3} {SO}_{3}^{-}$ . The barrier membrane and the resin bed at the bottom of the figure must both be anion-exchangers loaded with ${CH}_{3} {SO}_{3}^{-}$ .Draw this system and write the chemistry that occurs in each part.

What is electroosmosis?

Decomposition of dithionite $(S_{2} O_{4}^{2 -})$ .was studied by chromatography on an anion-exchange column eluted with 20mM tri-sodium 1, 3, 6-napthalenetrisulfonate in 90 vol% $H_{2} O / 10$

vol% ${CH}_{3} CN$ with ultraviolet detection at 280 nm. A solution of sodium dithionite stored for 34 days in the absence of air gave five peaks identified as ${SO}_{3}^{2 -}, {SO}_{4}^{2 -}, S_{2} O_{3}^{2 -}, S_{2} O_{4}^{2 -} and S_{2} O_{s}^{2 -}$ All the peaks had a negative absorbance. Explain why.

When the following three compounds are separated by micellar electrokinetic chromatography at, three peaks are observed. When 10mM $v α - cyclodextrin$ is added to the run buffer, two of the three peaks split into two peaks, giving a total of five peaks. Explain this observation and predict which compound does not split.

(a) The interstitial volume, $V_{0}$ , in Figure 26-15 is the volume at which the curves rise vertically at the left. Find $V_{0}$ for the 25-nm-pore-size column. To the nearest order of magnitude, what is the smallest molecular mass of molecules excluded from this column? (b) What is the molecular mass of molecules eluted at 9.7 mL from the 12.5-nm column? (c) $V_{m}$ is the volume at which the curves drop vertically at the right. Find the largest molecular mass that can freely enter the 45-nm pores.

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