Lithium can be determined by flame atomic spectrophotometry at our chosen wavelength 650 nm. How is...

Lithium can be determined by flame atomic spectrophotometry at our chosen wavelength 650 nm. How is this possible, given the strong Lithium emision from the flame at this wavelength? What effect does the Li emission have on the noise associated with the Li atomic absorption measurement? why is the air supported flame recommended for Li atomic absorption measurments and the nitrous oxide supported flame recommended for the Li atomic emission measurements?

Expert Solution

Gr 1 and Gr 2 elements of the periodic table are sensitive to flame atomic spectophotometry because they have one or two electrons in the outermost shell, hence posses with low excited energy. Li is one of those elements and is found to be one of them. When Lithium is introduced to the flame it emits radiation of red color which falls in the wavelength range 650nm-670nm and at 650nm, the lithium emission is found to be strong.

Air supported flame is recommended for Li atomic absorption measurement and the nitrous oxide supported flame recommended for the Li atomic emission measurements because air support and nitrous oxide acts like oxidant for the two different cases.

genius_generous answered 2 years ago

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