Decabromodiphenyl ether (DECA) has been used as a flame retardant in carpets and furniture. However, due to some concerns over health problems, the industry has begun phasing out its use. Suppose that the following chromatogram was produced when analyzing compounds found in carpets.
Source: Test Bank Hage/Carr Analytical Chemistry & Quantitative Analysis C. McLaughlin
1. Peak number 6 is DECA, determine the retention time of the compound. (1 marks)
2. Calculated the adjusted retention time of the compound (3 marks)
3. Calculated as the capacity factor (k’). (3 marks)
4. Explain why increasing the flow rate of the mobile phase would affect the tR but not affect k’. (4 marks)
5. The base width of peak number 6 is 0.60 min. Calculate the number of theoretical plates involved in the separation of DECA (Express your answer with 2 decimal places). (3 marks)
6. The compounds noted at peaks number 1 and 2 are not well resolved. List two chemical reasons related to the compounds that could cause this unfortunate lack of good separation. (2 marks)
7. Calculate the selectivity factor ɑ between peak number 1 and 2. (3 marks)
8. The resolution between peaks number1 and 2 has been calculated to be about 0.98. If N for peak number 2 was 580 and the column was 5.0 meters in length, calculate the height equivalent to a theoretical plate (HETP). (3 marks)
9. Discuss the effect of lengthening the column on HETP If all parameters were kept the same. (3 marks)
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