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Precision control of trace metals in streptomycin production Few American organizations enjoy the reputation for undeviating high quality that E. R. Squibb and Sons have built u p over the years. T h e i r products often mean the difference between life and death. A t Squibb, n o compromise is ever made with quality, regardless of trouble or expense. Squibb uses " N a t i o n a l " spectroscopic carbons in their spectrochemical method as one tool in the control of their streptomycin production. T h e u p p e r limit of trace metals in the finished product of streptomycin must be carefully controlled. H e r e is real precision quantitative* control. If the spectrograph does a job for Squibb, it should be useful in any analysis job requiring precision. WHY IT PAYS TO USE " N A T I O N A L " SPECTROSCOPIC ELECTRODES. National Carbon's spectroscopic electrodes are the purest obtainable. Each shipment is accompanied by a "Statement of P u r i t y " which tells your analyst w h a t trace elements are present in the electrodes. As a result, h e can assess his plates, or film, very quickly and accurately without being confused by unexpected spectral lines.
OTHER ADVANTAGES OF SPECTROGRAPHS ANALYSIS • Sensitive to 1/10,000,000 of a gram for some elements • Saves time in analysis • Detects unsuspected metals • Accurate testing is possible with very small sample • Provides a permanent record • Differentiates between two elements chemically very similar • Analysis can be made in some cases without destroying sample
The term "National" is a registered trade-mark of
NATIONAL CARBON DIVISION UNION CARBIDE AND CARBON CORPORATION
30 East 42nd Street, New York 17,N.Y. District Sales Offices: Atlanta, Chicago, Dallas, Kansas City, New York, Pittsburgh, San Francisco
