THIS FRACTION COLLECTOR IS
NEW CHEMICALS
tion. The carrier contains 1.01 grams of sodium chloride per liter of IN h y drochloric aoid. For a complete list of Standard Ref erence Materials write to the Superin tendent of Documents, TJ. S. Govern ment Printing Office, Washington, D . C. 20402, and ask for National Bureau of Standards, N B S Misc. Publ. 260. The cost is 45 cents. Specific Ion Electrode Standards Nine new high p u r i t y standardizing solutions for use i n calibrating elec trodes i n terms of either ionic activity or concentration are available i n colorkeyed, unbreakable, one-pint, poly ethylene bottles. Fluoride and chloride standardizing solutions are available i n concentrations of O . I M and 100 p p m , calcium ion, nitrate, bromide, and i o dide standards i n O.IM, and water hard ness standard i n 100 p p m . Orion Re search Inc., 11 Blackstone St., Cam bridge, Mass. 02139. 501
KNOW CARBON
πκπ
ANALYSIS
mm IN 70 SECONDS
F a t t y Alcohol Sulfates and Sulfonates
GOOD NEWS! When laboratory instruments combine reliable solid state circuitry with low cost and compact size, that's good news. And that's ISCO's Model 270 Fraction Collector. The highly dependable Model 270 features lift-off reels with 90 or 180 tube capacities and is ideally suited for either classroom or research use. At as little as $220.00 complete, it is the lowest priced fraction collector available, yet it still incorporates both timed and volu metric control. ISCO's other Fraction Collectors are good news too! The Model A is available for any combination of timed, drop counting, siphon or Volumeter (adjustable volumetric dispenser) operation and is equipped with a 240 tube reel. The Model AT offers much of the economy of the Model 270 and the flexibility of the Model A. The Model 240 is a preparative Fraction Collector especially de signed for large volume collecting. All ISCO Fraction Collectors can be used in a cold room with no modifica tions and have a one year guarantee. For more information about ISCO Fraction Collectors, please ask for Brochure FC31L. INSTRUMENTATION
SPECIALITIES
COMPANY, INC.
ISCO 5624 SEWARD AVE. · LINCOLN, NEBRASKA 68507, U.S.A. CABLE : ISCOLAB LINCOLN PHONE (402) 434-8265 Circle No. 122 on Readers' Service Card
Of special interest i n the study of protein binding and its effects on the stability of secondary and tertiary structures, 12 fatty alcohol sulfates and sulfonates i n 10- and 25-gram samples of 99'%+ purity are offered b y M a n n Research Laboratories, Inc., 136 L i b erty St., New Y o r k , Ν . Υ . 10006. 5 0 2
Melter can analyze carbon samples on the melt shop floor in less than 3 minutes from spoon to final analysis.
GC—Spectrophotometric Q u a l i t y Solvents
• C h e m i c a l laboratory a c c u r a c y — no extra man n e e d e d . Sulfur analysis also possible
The following high p u r i t y GC-spectrophotometric quality solvents are now available i n 500 m l and 1 liter sizes: acetone, carbon tetrachloride, chloro form, cyclohexane, 1,2-dichloroethane, dimethylformamide, ethyl acetate, hexane, methanol, methylene chloride, 2propanol, toluene, and 2,2,4-trimethylpentane. A certificate accompanying each product provides the actual gas chromatogram, the actual absorbance curve, and the actual lot analysis. J. T . Baker Chemical Co., Phillipaburg, N . J.
H Follow carbons from 4 . 5 0 % d o w n to tapping (magnetic methods give no control a b o v e 1 . 2 5 % carbon)
• N o waiting for the c h e m i c a l laboratory — he c h e c k s the c a r b o n whenever he likes
• Use thé c a r b o n - t e m p e r a t u r e drop method with assurance. A c c u r a t e control over the c a r b o n boil in the electric furnace • S c o r e s in use. T h o u s a n d s of tons t a p p e d every d a y o n this instrument
503 Fluoralloy Mixes
Four new fluoralloy mixes suitable for both organic and water soluble scintil lation systems are available: T L A , T L B , D X A , and D X B . Formulas T L A and T L B mix w i t h one gallon of tolu ene ; D X A and D X B with two liters of dioxane. Beckman Instruments, Inc., 2500 Harbor Blvd., Fullerton, Calif. 92634. 504
LECO PHONE, WIRE OR
WRITE
LABORATORY EQUIPMENT CORPORATION 147 HILLTOP ROAD ST. JOSEPH, MICHIGAN 49085 Circle No. 129 on Readers' Service Card
See ACS Laboratory Guide for Ail Products/Sales Office V O L . 3 9 , N O . 1 4 , DECEMBER 1 9 6 7
·
1 2 7 A
