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Which of the following is not a detector used in Flame emission photometers?

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Which of the following is not a detector used in Flame emission photometers?

(a) Photronic cell

(b) Photovoltaic cell

(c) Photoemissive tube

(d) Chromatogram

This question was posed to me during an online exam.

This key question is from Flame Emission Photometers topic in section Colorimetry and Spectrometry of Analytical Instrumentation

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Correct choice is (d) Chromatogram

The best I can explain: Detectors used in Flame emission photometers are Photovoltaic cell and photo emissive tubes. Photovoltaic cell is also known as photronic cell.

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