Product Capsules acid (Circle IFC-1) ; 2,2-dimethyI-4cyanobutyraldehyde (IFC-2) ; methacrylonitrile (IFC-3) ; 2,5-dihydroxybenzoquinone (IFC-4) ; 2,2-dimethylpentanol (IFC-5) ; and 2,2,4-trimethyl1,3-pentanediol (IFC-6). Eastman Chemical Products, Inc., Kingsport, Tennessee IFC-1 to 6 Cleaners. Circle 94A-2 for samples of "Alconox" (for hand washed equip ment), "Alcojet" (for machine washed equipment), and "Alcotabs" (for pi pette cleaning). Alconox, Inc., 853 Broadway, N. Y. 3, Ν. Υ. 94Α-2
Beckman® DK Automatic Recording Spectrophotometer Widest wavelength range— plus near-infrared With the analyst's growing interest in the near-infrared region of the spectrum, it is significant that the Beckman D K Spectro photometer has been selected as the standard in producing near-infrared curves. T h e near-infrared region, from .7 to 3.5 microns, is proving valuable in many fields, and especially in rocket fuel investigations. In fuming nitric acid for example, detection and measurement of water content is critical because the presence of 1 % water sharply cuts burning efficiency. Beckman DK-1 and DK-2 are fully auto matic recording instruments. With operating versatility and a broad line of accessories for hundreds of research a n d quality control applications, they offer the widest wavelength range—185 mM to 3500 mM (.185M to 3.5 μ ) — taking full advantage of ultraviolet and visible regions plus the important near-infrared. Ask your factory trained Aloe Representative for a demonstration. Write for bulletin AJ6-K.
ALOE SCIENTIFIC DIVISION
OF A. S. ALOE COMPANY
5655 Kingsbury, St. Louis 1 2 , M o . 74 Fully-Stocked Divisions Coast-to-Coast For further information, circle number 98 A on Readers' Service Card, page 85 A
98 A
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ANALYTICAL CHEMISTRY
Ion Exchange Resins. Circle 91A-2 for information on the following chro matographic grade "Amberlite" ion ex change resins: CG-120 (Na), CG-50 (H), CG-45 (OH), and CG-400 (CI). Rohm & Haas Co., Washington Square, Phila. 5, Pa. 91A-2 Reagents. Upon request Mallinckrodt analytical reagent distributors will make certain that a reserved supply of unusual reagents is available at all times. Mallinckrodt Chemical Works, 2nd & Mallinckrodt Sts., St. Louis 7, Mo. 19A Reagents. "Baker Analyzed" silver nitrate, ammonium thiocyanate, or po tassium chromate are used as précipitants in gravimetric determinations or as titrants in the classical Volhard and Mohr methods. Sodium chloride is used as a halide reference standard. Circle 29A for complete details. J. T. Baker Chemical Co., Phillipsburg, N. J. 29A
Reagents. Besides lab chemicals, company produces many standard reagents for bulk consumption and will produce special or unusual bulk chemicals to specifications. Fisher Scientific Co., 100 Fisher Bldg., Pittsburgh 19, Pa. 71A-1
Product Capsules Follow directions on page 85A to obtain free information on products and services described above
