41. To determine riboflavin (vitamin B2) by the additive method, a sample of a food product weighing 0.2000 g was dissolved and after appropriate processing the luminescence intensity of the resulting solution was measured, obtaining Ix = 30. After adding a standard solution containing a (µg) vitamin B2, the luminescence intensity increased to Iх Δ
SOLUTION FOR ALL OPTIONS
Options a b c d e
a, µg 17 33 50 26 40
Ix 0.50 0.70 0.90 0.60 0.80
Determine the mass fraction of vitamin B2 in the product if the luminescence intensity of the blank solution is 0.05.

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