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For a concentration of about 0.0001 to 2%, which method of analysis is used?

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For a concentration of about 0.0001 to 2%, which method of analysis is used?

(a) X-ray fluorescence

(b) Optical emission spectroscopy

(c) Surface spectroscopy

(d) Laser fluorescence

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Asked question is from Metal Composition Testing, Inspection of Materials in portion Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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Right option is (b) Optical emission spectroscopy

The explanation: A metal to be analyzed by XRF or OES requires a specially poured, chill-cast sample to retain the elements in solution and maintain homogeneity. XRF is most accurate at concentrations of about 0.1-50% whereas OES is most accurate for concentrations of 0.0001-2%.

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