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Which of the following is not an application of Flame emission photometers?

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Which of the following is not an application of Flame emission photometers?

(a) Analysis of biological fluids

(b) Determination of sodium, potassium in soil

(c) Determination of metals such as Mn, Cu

(d) Analysis of complex mixtures

This question was posed to me at a job interview.

My question is based upon Flame Emission Photometers in division Colorimetry and Spectrometry of Analytical Instrumentation

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Correct answer is (d) Analysis of complex mixtures

The explanation: The applications of Flame emission photometers are the analysis of biological fluids, determination of sodium and potassium in soil and determination of metals such as Mn and Cu. It is also used for the analysis of plant materials and industrial cement.

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