A Toxicology Screen Is Set Up Using Thin Layer Chromatographic

question 5

Multiple Choice

A toxicology screen is set up using thin layer chromatographic plates.Four positive controls/standards are used with the following distance of migration from application point results: Std A = 8 cm; Std B = 15 cm; Std C = 22.The acetone solvent front moved 35 cm.After processing an unknown sample,a solute had a migration distance of 16 cm.What are the retention factors (R_f) of standards A,B,and C?

• A) 8,15,22
• B) 8,12,18
• C) 4.4,2.3,1.5
• D) 0.23,0.43,0.63

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