Answer Happy

QUESTION 1 (16 MARKS) a. Separation of organic compounds (Bentazon, Bromacil, Bromoxynill, Butylate and Carbaryl) in wastewater was performed using gas chromatography with a 25 cm column length. The dead time for the separation was 0.9 min. Table 1 tabulates the data obtained Table 1 Organic compound Retention time (min) Peak width (min) Bentazon 5.8 0.25 Bromacil 6.6 0.59 Bromoxynill 7.9 0.74 Butylate 9.2 0.88 Carbaryl 15.1 0.94 I. Determine the linear velocity of Bromoxynill. (2 marks) The number of plates and plate height for the column based on Bentazon. (4 marks) iii. Discuss the efficiency of separation for Bentazon & Bromacil and based on their resolution. (6 marks) iv. Figure 1 shows the van Deemter plot for three packed columns with different stationary phase particle diameters. Based on the plots, choose a stationary phase particle diameter that would give the most efficient separation. (4 marks)