NEW
PRODUCTS
Not even a penny for upkeep No surface protection is needed. First cost is the last cost.
Trace elements can be analyzed in minutes at concentrations down t o 0 . 0 0 0 1 p.p.m. with this atomic ab sorption and flame spectrometer. The instrument has been developed from the basic design of the com pany's half-meter Ebert spectrometer. At concentrations of 0 . 1 p.p.m., t h e absorption accuracy is 1 0 % or better of the amount present in t h e sample. Jarrell-Ash, 2 6 Farwell St., Newtonville, Mass. 406 Thin-Layer
Chromatography
Plates Ready-made coated plates for use in thin-layer chromatography, TJniplates, are available in a variety of sizes. They are coated with silica, alumina, or one of 14 other adsorbent materials, and range in price from 50 to 75 cents for the 2 " X 8 " size. As many as eight separations can be carried out on a single 2 " χ 8 " plate. Custom Service Chemicals, New Castle, Del. 407
A L R E R E N F Q T O M F for 75 years the only perma^ • " • ^ f c l m f c l ^ f c O I U I M L nently satisfactory material for chemical laboratory table tops, shelving, sinks, splash backs, drain boards and fume hoods. Prompt delivery. ALBERENE STONE-A DIVISION OF THE GEORGIA MARBLE COMPANY. For FREE literature and technical assistance address·' THE ALBERMAR COMPANY, 386 PARK AVE. SOUTH, NEW YORK 16, Ν Υ DEPT C Circle Να. IE on Readers' Service Card
Call on us for A PERIODIC C H ARTFUL
Automatic chromatogram strip scan ning systems are available f o r precise localization of radioactivity on paper s t r i p chromatograms. An optional attachment permits scanning of t h i n layer chromatogram plates. Either analog or digital data presentation may be obtained using appropriate instrumentation. Radioactivity of soft beta-emitting isotopes such as t r i t i u m or carbon-14 is measured by two windowless Geiger detectors fitted with lead shields and collimators ar ranged in 4-pi configuration t o scan both sides of t h e s t r i p . Packard Instrument Co., Inc., Box 4 2 8 , La Grange, III. 408
of PURE
MATERIALS
with individual analysis certificates, as well as STANDARDS SPECTROGRAPHS PLATES FILM DEVELOPER GRAPHITE ELECTRODES
SPEX
INDUSTRIES, INC. · 3880 PARK AVENUE · METUCHEN, N. J. Circle No. 22 on Readers' Service Card VOL. 35, NO. 10, SEPTEMBER 1963 • 149 A
