NEWS Morrison, Cornell University, on highpurity tungsten rod. J. J. Tietzen, RCA Laboratories, de scribed electrical test methods used in pure materials analyses. Conductivity measurements (Hall Effect) are made on semiconductors and residual resis tivity measurements on metals to as certain the effect of impurities on the electrical properties of these materials. Electrical methods are very rapid, highly sensitive, nondestructive, precise, and quite inexpensive but, unfortu nately, are not specific nor do they measure actual concentrations but rela tive values. R. L. Hahn, ORNL, discussed the use of nuclear particles in pure materials analysis. He presented advantages and disadvantages of neutron activation analysis and told of the possible future application of 3 He particles which pro vide parts-per-billion sensitivity for oxygen and carbon. Another relatively untested nuclear analysis method de scribed was the γ,η reaction work of Engelmann at Saclay. By judicious choice of particle energy one can take advantage of threshhold reaction ener gies to determine oxygen, carbon, nitro gen, fluorine, and phosphorus. Hahn stated these nuclear methods may well find specific application in pure mate rials analysis. S. J. Adler, RCA Laboratories, clas sified the requirements of the general analytical laboratory associated with pure materials analysis as measurement of impurities and physical imperfection, elemental composition, oxidation states, detailed crystal structure, and auto matic data collection and computer processing. J. M. Shreyer, Union Car bide Nuclear Y-12 Plant, described the special laboratory facility built at Oak Ridge for high-purity materials re search. The room features vertical laminar-flow with a particle count of less than one particle per cubic foot. Papers on the analysis of high-purity materials were presented by (1) S. J. Rodgers, MSA Research Corp., on al kali metals, (2) C. F. Metz, Los Alamos Scientific Laboratory, on plutonium, (3) G. C. Goode, UKAEA AWRE, Aldermaston, England, on the application of differential cathode-ray polarography to beryllium and (4) J. H. Stewart, Union Carbide Nuclear Y-12 Plant, on calcium. J. P. Young, ORNL, told of his absorbance spectra measurements of sin gle crystals of the order of 0.1 to 0.3 mm. in diameter. Precision coulometry was stressed as a valuable but not widely used technique for standardiza tion for high accuracy purposes by E. L. Eckfeldt, Leeds and Northrup. He obtained a relative standard deviation of 0.003% on the analysis of potassium
ANALYTICAL STANDARDS Excellent for identification, calibration and standard ization of analytical instruments such as spectropho tometers, gas chromatographs, NMR, thin film and paper chromatography equipment. PolyScience kits are of the highest purity. Each chemical is purified and analyzed before packaging. They are not just a collection of commercial chemicals. Kits for quanti tative calibration are minimum 99.5+%. Besides offering standards of the highest purity at reasonable cost, each kit contains all the important data necessary for their effective use. There is no need for extensive literature search — you receive a comprehensive manual containing chromatograms (and/or IR spectra), retention data, physical proper ties, analytical hints and a complete bibliography list ing all references to the analysis of the type of com pounds supplied in each kit. 34 KITS AVAILABLE I N C L U D I N G « Amines · Ketones
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