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trends 9 analytical chemistry, vol. 4, no. 2,1985
3 G. Nota and A. Palombari, J. Chromatogr., 62 (1971) 153. 4 F. W. Willmott and R. J. Dolphin, J. Chromatogr. Sci., 12
(1974) 695. 5 R. J. Dolphin, F. W. Willmott, A. D. Mills and L. P. J. Hoogeveen, J. Chromatogr., 122 (1976) 259. 6 U. A. Tb. Brinkman, P. M. One1 and G. de Vries, J. Chromatogr., 171(1979) 424. 7 A. de Kok, R. B. Geerdink and U. A. Tb. Brinkman, J. Chromatogr., 252 (1982) 101. 8 Liquid Chromatography Applications, No. 13, Pye Unicam,
Cambridge, 1976. and J. S. Marlow, J. Chromatogr. Sci., 5 (1977) 29. 10 U. A. Th. Brinkman, A. de Kok and R. B. Geerdink, J. Chromatogr., 283 (1984) 113. 11 I. S. Krull and D. Bushee, Anal. Lett., 13A (1980) 1277. 9 A. T. Chamberlain
12 I. S. Krull, E. A. Davis, C. Santasania, J. Kraus, A. Basch and Y. Bamberger, Anal. Lett., 14A (1981) 1363. 13 U. A. Tb. Brinkman, R. B. Geerdink and A. de Kok, J. Chromatogr., 291(1984) 195. Udo A. Th. Brinkman graduated in physical chemistry in 1961, completed his Ph. D. thesis which dealt with the use of liquid anion exchangers in 1968 and was nominated professor in analytical chemistry at the Free University of Amsterdam in 1980. His main fields of interest are liquid, gas and thin-layer chromatography, with emphasis on sample pretreatment and the development of new detection methods. Frans A. Maris graduated in analytical chemistry from the Eindhoven University of Technology in 1983. He is now engaged in a research project on the use of LC-mass spectrometry and LC-ECD in environmental and pharmaceutical analysis.
books For those who want to know their micro
Microprocessor Programming and Applications for Scientists and Engineers, by R. R. Smardzewski, Elsevier 1984. US$37.75lDfl. 98.00 (xiv + 354pages) ISBN 0 444 42407 5
The invasion of the micros in the laboratory on one hand considerably augmented the means for advanced datatreatment and instrument control. On the other hand they caused an increasing need for the analytical chemist to learn the possibilities of this new machinery. This need expands from the knowledge of the performance and usefulness of mathematical methods for datatreatment, the knowledge of higher programming languages and interfaces, down to the knowledge of assembly languages when fast data-acquisition and datatreatment are required. The user of microcomputers who is for the first time confronted with the unfortunate need to program his micro
in assembly will find this book very useful because of the large number of worked out examples of little assembly programs. The material is divided over ten chapters which discuss computer organisation (12 p); number systems and code conversions (7 p); logic
gates (20 p); the 6502 MPU (70 p and 20 explained assembly programs); the 6522 VIA (12 p); monitor routines (7 p); data-acquisition (42 pages with 11 assembly programs); control (20 p); datacommunication and interfaces (18 p); programs development (18 p). The programming examples throughout the text were generated and tested on a Rockwell AIM 65 microcomputing system. The principles and ideas, however, are applicable to any 6502-based system (Apple, Acorn, Atain, BBC, Commodore, Rockwell). The text is written on the level of the freshman assembly programmer. The exercises and assembly programs are very clear and demonstrate the potentials of assembly quite well, and are very instructive. It is, however, rather disappointing that no examples are provided how to interface measuring devices to the micro over the well known RS-232 serial and IEE-488 parallel interface. Because the volume has not been written with the analytical chemist in mind, he will not find examples of fast data-acquisition from analytical instruments. Sometimes the reader will feel lost finding unexplained terminology and jargon in the first chap-
ters, which are discussed in later chapters. The book is of the camera-readytype with its well known limitations. In conclusion: the book is recommended for everybody who wants to carry out guided experiments to learn assembly programming with his computer (6502 CPU). Moreover, many teachers will find many useful experiments to be included in their practical courses in microcomputer programming. A little bit experience with the microcomputer on the general users level (BASIC-programming) is required to work through the book with success. B. VANDEGINSTE B. Vandeginste is at the Department of Analytical Chemistry, University of Nijmegen, Toernooiveld, 6525 ED Niimegen, The Netherlands.
New GC wallchart gives important guidelines A full colour wallchart, entitled “Guidelines for Gas Chromatography” and featuring the new Pye Unicam PU 4900 Total Analytical Chromatograph, has just been published by Philips Analytical. The wallchart offers a guide in words and graphics to the important aspects of optimising GC performance. “Guidelines for Gas Chromatography” is available from Pye Unicam Ltd, York Street, Cambridge, Great Britain CB12PX.