Standard addition. Selenium from 0.108 g of Brazil nuts was converted into the
Chapter 17, Problem 17-30(choose chapter or problem)
Standard addition. Selenium from 0.108 g of Brazil nuts was converted into the fluorescent product in Reaction 17-15, which was extracted into 10.0 mL of cyclohexane. Then 2.00 mL em ex of the cyclohexane solution were placed in a cuvet for fluorescence measurement. Standard additions of fluorescent product containing 1.40 g Se/mL are given in the table. Construct a standard addition graph to find the concentration of Se in the 2.00-mL unknown solution. Find the wt% of Se in the nuts and its uncertainty and 95% confidence interval. Volume of standard Fluorescence intensity added ( L) (arbitrary units) 0 41.4 10.0 49.2 20.0 56.4 30.0 63.8 40.0 70.3
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