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Chapter 32: Problem 5

Test your knowledge of detector terminology. Explain what the following acronyms stand for: (a) \(\mathrm{FID}\) (b) \(\mathrm{TCD}\) (c) \(\mathrm{ECD}\) (d) DAD.

Short Answer

Expert verified
'FID' stands for Flame Ionization Detector, 'TCD' is Thermal Conductivity Detector, 'ECD' represents Electron Capture Detector, and 'DAD' refers to Diode Array Detector.

Step by step solution

01

Explain 'FID'

\(\mathrm{FID}\) stands for 'Flame Ionization Detector'. This is a type of detector used in gas chromatography, which operates on the principle of detecting ions that form during combustion of a sample.
02

Explain 'TCD'

\(\mathrm{TCD}\) stands for 'Thermal Conductivity Detector'. This is another type of detector used in gas chromatography and it functions by sensing changes in the thermal conductivity of the column effluent.
03

Explain 'ECD'

\(\mathrm{ECD}\) stands for 'Electron Capture Detector'. This type of detector is used for detecting electron-absorbing components such as halogenated compounds.
04

Explain 'DAD'

DAD stands for 'Diode Array Detector'. It is widely used in liquid chromatography and functions by measuring absorbance of different wavelengths.

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Most popular questions from this chapter

Test your knowledge of chromatographic theory - define the following terms: (a) Dead time \(\left(t_{0}\right)\) (b) Retention time \(\left(t_{\mathrm{R}}\right)\) (c) Capacity factor (k) (d) Separation factor \((\alpha)\) (e) Column efficiency \((N)\).

Calculate the capacity factor, resolution and number of theoretical plates of two components from a chromatogram. Quinaldine and nicotine have retention times of \(5.9\) and \(6.2\) min, respectively on a \(30 \mathrm{~cm} \times 0.25 \mathrm{~mm}\) id \(\times 0.25 \mu \mathrm{m}\) film thickness DB5 column. If the peak width of quinaldine is \(0.16\) min and for nicotine is \(0.18 \mathrm{~min}\), calculate (a) Capacity factor for quinaldine and nicotine (b) Column resolution (c) Average number of theoretical plates in the column (column efficiency, \(N\) ) per compound. Note: the retention time of the unretained component is \(1.0 \mathrm{~min}\).

Calculate the resolution and efficiency of two compounds. Compounds \(X\) andY have retention times of \(18.40\) and \(20.63\) min, respectively, on a 30 \(\mathrm{cm}\) column. If the peak widths at the peak bases are \(1.11\) and \(1.21\) min, respectively, calculate: (a) The resolution factor for the two peaks. (b) The efficiency of each peak.

Check your knowledge of liquid chromatography detectors. Make a list of the various major types of liquid chromatography detector in order, from highest to lowest sensitivity. Which of these methods is most versatile and why?
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