NEW BOOKS
We're
Specialists:
Are You? GLASS LATHES GAS/OXY BURNERS ACCESSORIES MERCURY HEATHWAY CATALOG? B
A
YES
BETHLEHEM APPARATUS CO., Inc. FRONT AND DEPOT STS. ·
HELLERTOWN, PA. 18055
Telephone (215) 838-3691
Circle No. 2G on Readers' Service Card
Calorex: the absurdly simple heat exchanger But safe: Explosion-proof, doesn't use electricity. But versatile: Flexible, flat-sided tubing and so can be easily wrapped around any contour of any size (flasks, distillation columns, piping, centrifuges, tanks, tubes, drums, etc., etc.). But utilitarian: Multiple uses in laboratory, pilot plant, production. But temperature-tolerant: Several materials permit wide temperature range for heating or cooling: - 7 5 ° to +480°F. But option-providing: Three diameters (8, 15 and 30mm.), various lengths (25, 50 and 100 feet). But communicative: As our 16-page brochure demonstrates. For the Calorex brochure, prices and distributors, request file 1 1 8 A . Thermoflex.lnc, 128 W. 59th St., New York 10019 · (212)-582-5462 Circle No. 204 on Readers' Service Card 78 A
·
ANALYTICAL CHEMISTRY
written reports should give the student a good understanding of many fundamental principles of chemistry and an introduction to a variety of measurement techniques.
Residue Reviews. Vol. 16. Francis A. Gunther, Editor, vi + 158 -pages. Springer-Verlag, Inc., New York, 1966. $ 7 . 4 0 Reviewed by Sidney Williams, Division of Food Chemistry, Food and Drug Administration, Washington, D. C. 20204 Volume 16 of "Residue Reviews" maintains the quality shown in the earlier volumes. With the variety of topics covered it might be expected that each would be treated in a general and popularized manner. This is not so. Each article is written for the expert in its field as well as for the ordinary worker. The chapter on adsorbents used in cleanup columns brings together much of what is known on the subject and contains a most useful list of references. As Morley points out, one of the problems in residue analysis work is the lack of standardization of adsorbents. Pinpointing of the problem is in itself valuable to the chemist. Findings of pesticide residues in the total diet samples have been reported in several papers and have been widely quoted. In this chapter, Cummings describes the evolution of the total diet program of the Food and Drug Administration. In addition to summarizing the analytical findings in these samples, he explains how and why the samples are selected, prepared, and analyzed. The chapter on behavior of herbicides in soil will be most useful to those involved with the development or use of herbicides. The review describes the action of herbicides as influenced by ''placement, sorption equilibrium in soil, inherent phytotoxicity and microbiological effects." Factors which make one herbicide more effective than another in a specific application are explored. In discussing the extraction of chlorinated pesticides from plant materials, Wheeler and Frear emphasize a truth that is too frequently ignored. They point out that recovery of residues from fortified samples is not a valid indication of how effectively the method will extract field-applied residues. They conclude that "The only means to obtain a true measure of extraction efficiency is the field application of labelled pesticides." A considerable amount of work is reported in the chapter on biphejvyl in
