BETHLEHEM INSTRUMENT MERCURY BEST I N PURITY To qualify as Instrument Mercury, the total residue after complete evaporation of a 200 gram sample may not exceed one part impurity per ten million. All BETHLEHEM Instrument Mercury fully meets this rigid standard—and proves it with the analysis certification included in each shipment.
CONTINUOUS VACUUM, TRIPLE DISTILLATION ALL BETHLEHEM INSTRUMENT MERCURY IS PURIFIED IN THESE STILLS which operate in three continuous, stages under vacuum and controlled low temperature.
BEST I N
PACKAGING
BETHLEHEM Instrument Mercury is available in five differênr polyethylene bottles, with plain cap on the 16-ib. and 65-lb. bottles, and the unique dispensing tip on the 9-oz., l-lb.» and 6-Ib. sizes. (Five and 10-lb. glass bottles are also available.)
BEST I N SERVICE BETHLEHEM exchanges dirty or scrap mercury for Instrument Mercury. W e supply empty flasks free for safe storage and inexpensive shipment to us.
Over one million pounds shipped to manufacturers, laboratories
process and control
research industries*
BETHLEHEM APPARATUS COMPANY, INC. HELLERTOWN, PA. Circle No. 1α on Readers' Service Card
ONE PART PER MILLION Model HE 43 Series DRI-LAB
and HE 373 Series DRI TRAIN
STANDARD AND CUSTOM CONTROLLED INERT ATMOSPHERE RECIRCULATING GAS PURIFICATION SYSTEMS FOR SPACE AGE R & D AND PRODUCTION
O2 and H2O (Optional N2 Removal Capability)
For full information write or c a l l : (area code 213) 983-0763.
VACUUM/ ATMOSPHERES CORPORATION 7356 GREENBUSH AVENUE, NORTH HOLLYWOOD, CALIFORNIA Circle No. 79 an Readers' Service Card
76 A
·
ANALYTICAL CHEMISTRY
BOOKS Extensive tables of mobility data, under varied conditions, for representatives from each class of compounds appear throughout the text. This unique feature will be most helpful for locating and identifying substances, once separations have been achieved. Virtually no consideration is given to the clinical or biochemical interpretation of results. Preparative methods receive little attention. The description of immunochemical methods is inadequate and the sections on enzymes and hemoglobins are much too limited. The theoretical discussion is elementary and occupies only 14 pages. Within these limitations, this is a good manual for laboratorians. The Chemistry of Non-Aqueous Solvents. Volume il. Acidic And Basic Solvents. J. J. LagowsM, Ed. xv + 398 pages. Academic Press, 111 Fifth Ave., New York, Ν. Υ. 10003. 1967. $18.60. Reviewed by Jacob Kleinberg, versity of Kansas, Lawrence, 66044.
Uni Kan.
The first volume of this series had as its subtitle "Principles and Techniques" and was concerned only incidentally with the consideration of specific non aqueous solvents. In the current book, six of the seven chapters deal with specific acidic or basic solvent systems: "Liquid Hydrogen Chloride, Hydrogen Bromide, and Hydrogen Iodide," by Frank Klanberg; "Anhydrous Hydro gen Fluoride as a Solvent and a Me dium for Chemical Reactions," by Mar tin Kilpatrick and John G. Jones; "Sul furic Acid," by W. H. Lee; "Nitric Acid," by W. H. Lee; "Amides," by Joe W. Vaughn; and "Liquid Ammonia," by J. J. Lagowski and G. A. Moczygemba. "The Physical Properties of Metal Solutions in Non-Aqueous Solvents," by J. C. Thompson, constitutes the re maining chapter. Not unexpectedly, the section on the heavier liquid hydrogen halides, HC1, HBr, and HI, covers primarily the first of these compounds. The difficulty in obtaining liquid hydrogen bromide and iodide in quantity in the pure con dition, along with their instability, militates against their use as solvents. Even the literature on liquid hydrogen chloride is meager, most of it dating from 1958 when there was a revival of interest in species containing the HC12~ ion. A description of reactions in liquid hydrogen chloride makes up about Half the chapter. Most of the reactions are of the acid-base type and are considered from the viewpoint that the solvent undergoes the following self-ionization.
