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Principles of Instrumental Analysis, 6th ed. Chapter 27
 
 10
27-25. 
 
27-26 
 
27-27. (a) Increasing VS/VM leads to an increase in the film thickness df. This increases causes a 
marked increase in CSu (Table 26-3) and thus an increase in H. 
(b) Reducing the rate of sample injection will lead to band broadening because all the 
molecules do not start to traverse the column at the same instant. Reduced efficiency and 
an increase in H results. 
(c) Increasing the injection port temperature will tend to decrease H because the same 
evaporation rate will increase. Thus, the sample will be put on the column in a narrow 
band with less initial zone spreading.