CHEM 2001 : Exam2 Garno Key 2014
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Which sample can be analyzed using aas or icp-aes: quinine concentration in tonic water, the concentration of caffeine in a coffee sample, the amount of copper in a river water sample. Question 3. (5 pts) circle true or false: Isocratic elution is accomplished with a single solvent, or a constant solvent mixture. Size exclusion chromatography (sec) separates particles on the basis of size. Separations using precipitation are based on differences in volatility. Separations based on distillation are based on differences in the boiling points of the components. With gradient elution, the ratio of solvent a to solvent b is changed to create a gradient of mixed solvents. Question 4. (10 pts) (10 pts) phthalate esters are mainly used as plasticizers, however they are being phased out because of health concerns. The chromatogram for a 20 ug/ml calibration mixture of six phthalate esters analyzed by gas chromatography using a flame ionization detector is shown below.
