If the partition coefficients for the DCM/water and DCM/bicarbonate systems were different, what was the reason?

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OC4396189Lv10

16 Jun 2022

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Deanna HettingerLv2

18 Jan 2019

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A procedure to determine nicotine in urine utilizes an internalstandard method for quantitation. A 10.0 mL urine sample containingno nicotine was spiked with 10 microL of a solution containing 100microg/mL of the internal standard 5-aminoquinoline (5-AQ) and 10microL of a solution containing 50 microg/mL of nicotine. A 5.0 mLvolume of dichloromethane (DCM) was then added and the sampleshaken for 10 minutes. Extraction efficiencies for both compoundswere assumed to be 100%. The DCM fraction was then removed and a1.0 microL aliquot injected for GC analysis. The areas obtained forthe 5-AQ and nicotine from the resulting chromatogram were 345 and470 relative area units respectively. Extraction of a urine sampleknown to contain nicotine was performed by spiking a 10.0 mL sampleonly with 10 microL of the 5-AQ internal standard prior toextraction with 5.0 mL of DCM. The DCM was then evaporated down to1.0 mL prior to using a 1.0 microL injection for the analysis. Thepeak areas for this chromatogram for the 5-AQ and nicotine were1740 and 680 units respectively. Calculate the concentration ofnicotine in the urine sample in microg/mL.

yellowoyster946

1.In steam distillations one usually recovers more water than is compute using Dalton's Law and vapor pressure. Give two simple potential reasons for this.

2. Bromine in DCM was used to test for Unsaturation and IR spectrum was also used of the compound. However, neither method could really give a direct answer for the number of C=C bonds present. What methods would be used to discern this information?

Why did you only titrate the aqueous layer during the experiment? (my experiment about the extraction)

Could you have titrated the organic layer to figure out the distribution coefficients and other data? Why or why not?