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The reference cell is packed with which of the following in the Adsorption detector used in liquid chromatography?

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The reference cell is packed with which of the following in the Adsorption detector used in liquid chromatography?

(a) Inactive glass beads

(b) Porous glass beads

(c) Alumina

(d) Silica

This question was posed to me in a national level competition.

My enquiry is from Detection System of Liquid Chromatography in portion Chromatography of Analytical Instrumentation

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Correct answer is (a) Inactive glass beads

To explain: In Adsorption detector used in liquid chromatography, the reference cell is packed with inactive glass beads. The other detector cavity is packed with silica, alumina or porous glass beads.

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