By James F. Lawrence
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106, 249 (1975). I. S. Krull, M . H. Wolf, and R. B. Ashworth, Am. Lab. 10, 45 (1978). A . Pryde,7. Chromatogr. Sci. 12, 486 (1974). C. Horvath and W . Melander, J. Chromatogr. Sci. 15, 393 (1977). N . H. C. Cooke and K. Olsen, Am. Lab. 11, 45 (1979). F. M . Rabel, Am. Lab. 7, 53 (1975). R. E. Majors, Am. Lab. 8 , 13 (1975). R. P. W . Scott and P. Kucera, J. Chromatogr. Sci. 12, 473 (1974). M . Gurkin, Am. Lab. 9 , 29 (1977). A . P. Shroff, Am. Lab. 8 , 13 (1976). Chapter 5 Detectors I. INTRODUCTION Detectors for modern L C are of several distinct types.
T h e s a m p l e is i n j e c t e d a n d i m m e d i a t e l y f l u s h e d o n t o t h e c o l u m n by t h e m o v i n g m o b i l e p h a s e . will absorb mobile phase appreciably and swell or become hard and brittle. Both effects weaken the septum, reducing its lifetime significantly. It has been suggested that wrapping the septum with inert material such as Teflon tape will increase septum deterioration. 1 lists some septum materials and their compatabilities with various solvents. Since sample injection via septum is made at the pressure of the system, it is necessary to use syringes capable of withstanding pressures up to 1000-1500 psi.
Kirkland, Analyst (London) 9 9 , 859 (1974). R. M. Cassidy,7. Chromatogr. 117, 71 (1976). Chapter 4 Chromatography Columns a n d Packing Materials I. REQUIREMENTS FOR TRACE ANALYSIS The main requirement of chromatography packings used for trace anal ysis is that they be capable of separating the analyte peak efficiently from other sample components. This of course also depends upon other factors such as the type of mobile phase and the sample itself. The major criterion for evaluating a column is efficiency (see Chapter 6, Chromatog raphy).