Which statement regarding the techniques utilzed in splitless injection for gas chromatographic analysis is NOT true?Select onea. Solvent trapping and cold trapping sharpen the peaks for all components, including the solvent and solutes.b.Cryogenic focusing is required, with an initial column temperature below room temperature, for low boillingOc In solvent trapping, the Initial column temperature is set 10-20°C below the bolling point of the solvent.d. In cold trapping, the initial column temperature is at least 100°C below the boiling points of the solute of interest.e. In solvent trapping. both solvent and solutes are condensed at the column head.

Answered: Image /qna-images/answer/f31ba8c5-d982-4a5b-bd15-32e696a04af7.jpg

Which statement regarding the techniques utilized in splitless injection for gas chromatographic analysis is NOT true? Select one a, Solvent trapping and cold trapping sharpen the peaks for all components, including the solvent and solutes. Ob. Cryogenie focusing is required, with an initial column temperature below room temperature, for low bolling Oc In solvent trapping, the Initial column temperature is set 10-20°C below the bolling point of the solvent. Od. In cold trapping, the initial column temperature is at least 100°C below the boiling points of the solute of interest. e. In solvent trapping. both solvent and solutes are condensed at the column head.

Which statement regarding the techniques utilized in splitless injection for gas chromatographic analysis is NOT true? Select one a, Solvent trapping and cold trapping sharpen the peaks for all components, including the solvent and solutes. Ob. Cryogenie focusing is required, with an initial column temperature below room temperature, for low bolling Oc In solvent trapping, the Initial column temperature is set 10-20°C below the bolling point of the solvent. Od. In cold trapping, the initial column temperature is at least 100°C below the boiling points of the solute of interest. e. In solvent trapping. both solvent and solutes are condensed at the column head.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

A student used thin layer chromatography to confirm whether he could successfully separate two compounds. Here is the TLC plate he obtained after 30 min. Stationary phase was silica gel and mobile phase was 95 % ethyl acetate and 5 % Hexane mixture.
Match column A with column B. v Mobile phase: NON-POLAR v Stationary phase: NON-POLAR A. Reverse Phase Chromatography B. Normal Phase Chromatography v mobile phase - organic compound such as ether v Mobile phase: POLAR - using TLC plate v using silica gel v paper chromatography
Explain correct and incorrect option.
A mixture of species of A, B, and C is injected into a liquid chromatographic column with length of 20.0 cm. The obtained separation results are listed as follows: Please calculate the resolution for species B and C from the data. Please keep your result to two decimal places. The answer would be 1.22, I would need help how to get that answer
which of the folowing(s) is/are true ? 1 split ratio in GC is a ratio of sample passed to column to amount of mobile phashe 2 column resolution decreases with increasing column lenght 3 decreasing the tube diameter ,increases the resolution
What are the mechanisms of samples separation work in Thin layer Chromatography? Please shortly answer at your own words. Answer should be to the point (specific 4-5 lines).
35. The stationary phase, as well as mobile phase, are liquid in Adsorption column chromatography O Partition column chromatography Gel column chromatography
You must separate three different compounds with reversed phase HPLC. Compound 1 is an acid (pKa = 4.3), compound 2 is neutral compounds and compound 3 is a base (pKa = 9.6). As eluent, use 30/70 (v / v)% methanol / pH 3.0 formic acid buffer. The retention time and the top width at the base of the top for the three components are presented below. You can assume the dead time to 1.2 minutes in your calculations.Compound Retention time [minutes] Peak width [seconds] 1 10.1 282 5.0 143 6.1 17a) Calculate the efficiency (number of theoretical bases) for component 1.b) Calculate the selectivity and resolution between components 1 and 2.c) When you increase the pH of your eluent to pH 6, how will the retention be affected (increase, decreaseor unchanged) for the different associations (1, 2 and 3) ?, justify your answer.d) How retention factors are generally affected by an increase in the proportion organicallymobile phase solvents for reversed phase HPLC separations ?, justify your…
Consider the following chromatographic data for the separation of methylparaben from ethylparaben in a sunscreen sample. Compound Methylparaben Retention time, tr (min). Width at base of peak, Wb (min) 3.2 4.2 0.55 0.60 Ethylparaben A compound not retained by the column in this analysis had a tm of 0.75 minutes. The column used was a C18 column with a mobile phase mixture of 75% methanol and 25% water. Calculate the number of theoretical plates for ethylparaben.
The figure below shows a portion of a GC chromatogram for a mixture of two aromatic compounds labeled A and B. The separation employed a 2.50 meter packed column under isothermal conditions (90 °C) and a flow rate of 10 mL/min. in (c) Detector Signal 300.0 250.0 200.0 150.0 100.0 50.0 0.0 1.0 Unretained 1.2 1.3 1.4 1.5 time (min) Calculate the retention factors for each peak. 1.5
Please answer this
2. A gas chromatogram of a four-(4)-component mixture had the following areas and retention times (RT). Component ABCD (RT) (min) 2.564 5.241 1.904 3.217 Area (mm²) 2341 1278 4302 1987 A. Which compound do you suspect is the most volatile? Why? B. Calculate the percent composition of component D.