AC BRIEFS Highlights of the scientific and technical articles in this issue
Chronopotentiometry in Acetic Anhydride. Oxidation and Reduction of the Solvent A study is undertaken to elucidate the anodic and cathodic reactions that occur when current is passed through acetic anhydride-acetic acid solutions. At the cathode hydrogen gas and acetate ions are formed, while at the anode hydrogen gas and acetylium ions are formed. W . B. M A T H E R , Jr., and F. C . A N S O N , California Institute of Technology, Pasadena, C a l i f .
Separation of Iridium from Rhodium by Extraction with Tributyl Phosphate A batch solvent extraction method is devised for remov ing large quantities of iridium from micro quantities of rhodium. The sample is extracted with tributyl phosphate and the iridium enters the organic phase. Rhodium in the aqueous phase is determined spectrophotometrically. R. B. W I L S O N Athens, G a .
and W .
D. J A C O B S ,
Constant current potentiometry technique is applied to the nonaqueous titration of organic amines. A series of bases dissolved in m-cresol or aeetonitrile are titrated with perchloric acid. Accuracy and precision are com parable to the zero-current potentiometric or indicator titration procedures. G . R. S V O B O D A , University of Wisconsin, Madison, W i s . A n a l . C h e m . 33, 1638 ( 1 9 6 1 )
of
Georgia,
A n a l . C h e m . 33, 1650 ( 1 9 6 1 )
A n a l . C h e m . 33, 1634 ( 1 9 6 1 )
Application of Constant Current Potentiometry to Nonaqueous Titrations of Organic Bases
University
Spectrophotometric Study of p-Nitrosodimethylaniline as a Sensitive Colorimetric Reagent for Rhodium The reagent p-nitrosodimethylaniline is used in the colori metric determination of trace amounts of rhodium. The sample in a buffered solution is reacted with the reagent with heating, and the color complex formed is measured at 510 ταμ. Optimum concentration range for analysis is 0.3 to 1.1 p.p.m. R. B. W I L S O N Athens, G a .
and W .
D. J A C O B S ,
University
of
Georgia,
A n a l . C h e m . 33, 1652 (1961)
Differential Thermometric Titrations and Determination of Heats of Reaction A differential thermometric apparatus is described for use in thermometric titration procedures. Temperature sens ing devices are used in both sample and blank solutions and the differences in temperature are automatically recorded and analyzed. The technique has increased sensitivity and reduced the ill effects due to extraneous heat.
Complexometric Determination of Fluoride with C e r i u m ( l l l )
Jr., and C . E. BRICKER,
The fluoride content of certain inorganic samples contain ing metal ions and some anions is determined by a com plexometric method. Fluoride is separated by pyrolysis and precipitated with cerium ( I I I ) . The excess cerium is back-titrated with E D T A against an arseneazo-cresol red indicator. Sulfate and borate ions interfere.
A n a l . C h e m . 33, 1640 ( 1 9 6 1 )
S. S. Y A M A M U R A , M . E. KUSSY, and J . E. R E I N , Phillips Petro leum C o . , Idaho Falls, Idaho
B. C . T Y S O N , Jr., W . H . M c C U R D Y , Princeton University, Princeton, N . J .
A n a l . C h e m . 33, 1655 (1961)
Separation of Macro Quantities of Thorium with 2-Thenoyltrifluoroacetone A rapid extraction procedure is used for the separation of gram quantities of thorium from alkaline earth and rare earth elements. The sample solution is adjusted to pH 4.5 with an acetate buffer and thorium extracted with 2-thenoyltrifluoroacetone. T. C . R A I N S , M A R I O N F E R G U S O N , and H . P. H O U S E , O a k Ridge National Laboratory, O a k Ridge, Term. A n a l . C h e m . 33, 1645 ( 1 9 6 1 )
Analysis of Thallium Amalgams A simple, precise method is devised for determining thallium in thallium amalgams. The amalgam is dis solved in nitric acid and the interference of mercury removed by precipitation with formic acid. Thallium is estimated by titrimetric or coulometric procedure. W . T. FOLEY and J . M . O S Y A N Y , St. Francis Xavier University, Antigonish, Nova Scotia A n a l . C h e m . 33, 1657 (1961)
Determination of Thorium in Low-Grade Ores Using a Cation Exchange Separation-EDTA Titration Procedure The thorium content of low-grade ores is determined by using a cation exchange technique followed by titration with E D T A . Interference due to ferric iron is eliminated by reduction to ferrous iron. The titration is accom plished using an Xylenol Orange indicator. F. W . E. S T R E L O W , South African Council Industrial Research, Pretoria, South Africa
for Scientific and
A n a l . C h e m . 3 3 , 1648 ( 1 9 6 1 )
Extraction and Determination of Gold with Tetraphenylarsonium Chloride Gold in solutions containing common metals is determined specti'ophotometrieally using tetraphenylarsonium chloride as reagent. In the reaction the gold-tetraphenylarsonium chloride complex precipitates and is extracted with chloro form. Maximum absorbance is measured at 323 ταμ. J . W . M U R P H Y and H . Oklahoma, Norman, O k l a .
E. A F F S P R U N G ,
The University
of
A n a l . C h e m . 33, 1658 ( 1 9 6 1 )
VOL. 33, NO. 12, NOVEMBER 1961
•
9 A
BRIEFS Ultraviolet Determination of Uranium in Concentrated Hydrochloric Acid Micro amounts of uranium in hydrochloric acid are determined by a spectrophotometric method. The chloride complex of uranium indicates maximum a b sorbance at 246 ταμ. Interfering ionic species are re moved by several extractions of uranium with ethyl acetate. C. M. CALLAHAN, U. S. Naval Radiological Defense Labora tory, San Francisco 24, Calif. Anal. Chem. 33, 1660 (1961)
Increased Selectivity in Chelometrie Titrations through End Point Location by Linear Extrapolation. Copper as a Photometric Indicator The scope of chelometrie methods is greatly broadened by application of the inherent selectivity of linear ex trapolation techniques of end point location. Examples are given in photometric titrations with a C u ( I I ) indica tor. Calcium is determined in the presence of magnesium and cadmium in the presence of zinc.
Improvements in the X-Ray of Cement Raw Mix
Emission Analysis
A new fusion method is used in the x-ray emission analysis of cement raw mix. T h e technique greatly re duces the area of disagreement between accuracy and precision, and eliminates the need for type standardiza tion. Synthetic standards may be used in the fusion method. GEORGE ANDERMANN, Glendale, Calif.
Applied
Research
Laboratories, Inc.,
A n a l . C h e m . 3 3 , 1689 ( 1 9 6 1 )
X-Ray Emission Analysis of Finished Cements The minimum flux technique is applied t o the x-ray emis sion analysis of finished cement samples. I t has greatly enhanced the accuracy of t h e analysis and therefore decreased the gap between accuracy and precision in the analysis. G E O R G E A N D E R M A N N and J . D. A L L E N , A p p l i e d Laboratories, Inc., G l e n d a l e , C a l i f .
Research
A n a l . C h e m . 33, 1695 ( 1 9 6 1 )
D. A . A I K E N S , G A B Y S C H M U C K L E R , F. S. SADEK and C . N . REILLEY, University of North C a r o l i n a , C h a p e l H i l l , N . C . A n a l . C h e m . 33, 1664 ( 1 9 6 1 )
Geometrical Representation and X-Ray Fluores cence Analysis of Ternary Alloys Improvements in the Fluorometric Determination of Submicrogram Quantities of Beryllium A rapid and sensitive fluorometric procedure is devised for the determination of beryllium using morin as reagent. Complexing agents are used to reduce interference due to scandium, yttrium, and lanthanum. Beryllium is deter mined in metallic thorium, zirconium, uranium, copper alloys, and aluminum as well as in other materials.
Ternary alloy composition is calculated from the count fractions obtained from fluorescence x-ray spectra. T h e calculation involves a simple and accurate graphical pro cedure. Composition is calculated by converting weight to atomic per cent. T h e bismuth-germanium-tellurium sys tem is used as an example. A B R A H A M T A Y L O R , B. J . K A G L E , and E. W . BEITER, W e s t i n g house Research Laboratories, Pittsburgh 3 5 , Pa. A n a l . C h e m . 3 3 , 1699 ( 1 9 6 1 )
C . W . SILL, C . P. W I L L I S , and J . K. F L Y G A R E , Jr., U . S. A t o m i c Energy Commission, Idaho Falls, Idaho A n a l . C h e m . 33, 1671 ( 1 9 6 1 )
Use of Very Short-Lived Isotopes in Activation Analysis
Decomposition of Refractory Silicates in Ultramicro Analysis A technique is devised for the rapid and complete de composition of mixtures of refractory silicates and oxides. T h e sample is dissolved in hydrofluoric acid, evaporated, and fused with potassium fluoride in a platinum dish. Sul furic acid is added and a pyrosulfate fusion performed which precedes the final dilution for analysis. T h e pro cedure will handle samples as large as 1 to 2 grams.
A technique for activation analysis is described using very short-lived isotopes. Identification and analysis are carried out by 7-ray spectrometry with an analysis time involvement of less than 7 2 hour. As little as 1 p.p.m. of hafnium is detected. O . U . A N D E R S , The Dow Chemical C o . , M i d l a n d , M i c h . A n a l . C h e m . 3 3 , 1706 ( 1 9 6 1 )
C . W . SILL, U . S. A t o m i c Energy Commission, Idaho Falls, Idaho A n a l . C h e m . 33, 1684 ( 1 9 6 1 )
X-Ray Powder Diffraction Patterns of Some Cadmium Phosphates X-ray powder diffraction patterns are obtained for two monobasic orthophosphates of cadmium. Chromato graphic analyses of the samples are reported where they are corroborated by infrared analysis. R. C . ROPP, R. W . M O O N E Y , and C . W . Sylvania Electric Products, Inc., Towanda, Pa.
W.
HOFFMAN,
A n a l . C h e m . 33, 1687 ( 1 9 6 1 )
X-Ray Spectrographic Determination of Thorium in Uranium Ore Concentrates X-ray spectrographic techniques are used for determining the thorium content of uranium ore concentrates. For necessary precision and accuracy an internal standard is required. The U Li peak of uranium is used as the inter nal standard. N o interference is encountered from other elements at ordinary concentration levels. W . C . S T O E C K E R and C . H . M c B R I D E , Mallinclcrodt Works, Saint Charles, M o .
Chemical
A n a l . C h e m . 33, 1709 ( 1 9 6 1 )
VOL. 33, NO. 12, NOVEMBER 1961
•
11
A
BRIEFS Radiochemical Separation of Cadmium by Amalgam Exchange An amalgam exchange technique is used for the radiochemical separation of cadmium in reactor effluents. The amalgam exchange step is followed by a back extraction with thallous ion to selectively remove cadmium from contaminants in the mercury. Indium, thallium, and selenium indicate the strongest interference. J. R. DeVOE, H. W . NASS, and W . W . MEINKE, University of Michigan, Ann Arbor, Mich. A n a l . C h e m . 33, 1713 ( 1 9 6 1 )
The Basis of Selectivity in Chromatography, Electrochromatography, and Continuous Electrochromatography The critical conditions required for separation using chromatography, electrochromatography, and continuous electrochromatography techniques are reviewed with reference to selectivity. The nature of the substance being separated and the migration conditions influence selectivity of a system. There is no common basis for comparison of selectivity of the separation techniques. H. H. STRAIN, Argonne National Laboratory, Argonne, III. Anal. Chem. 33, 1733 (1961 )
Absorptivity Correction in Multicomponent Spectrophotometric Analysis An absorbance ratio correction technique is used in spectrophotometric analysis of multicomponent mix>tures. The ratio is derived from the relationship of the observed absorbance of a mixture to the sum of absorbances of the separate components of the mixtures. The technique is applied to infrared analysis of a ternary mixture of phenols. ELIZABETH PILLION, M. R. ROGERS, and A. M. KAPLAN, Quartermaster Research and Engineering Center, Natick, Mass. Anal. Chem. 33, 1715 (1961)
Silica Gel Structure and the Chromatographic Process. Effect of Pore Diameter on the Adsorption and Differential Migration of Sterol Acetates A criterion is developed for the evaluation of silica gels used in the adsorption chromatography of sterol acetates. In the adsorptive process, the utilization of surface area is dependent on the average pore diameter and the molecular area of the adsorbate. Six silica gels are studied systematically. P. D. KLEIN, Argonne National Laboratory, Argonne, III. Anal. Chem. 33, 1737 (1961)
Lead,
Continuous Separation of Gaseous Mixtures by Thermal Gravitational Diffusion
Rapid and simple chemical separation procedures are developed for the quantitative separation of lead and barium, of cadmium and mercury, and of lead and zinc. The procedures are based on the reducing action of aqueous sodium borohydride solutions.
A thermal gravitational diffusion technique is developed for the continuous separation of gaseous mixtures. A specially constructed rectangular cell is employed in the complete apparatus to provide three mutually transverse driving forces—thermal gradient, gravity, and gas flow. Each of the three diffusion cells is tested with four gas mixtures.
Aqueous Sodium Borohydride Chemistry. Barium, Mercury, Cadmium, and Zinc
G. W . SCHAEFFER, M. C. WALLER, and L. F. HOHNSTEDT, Saint Louis University, Saint Louis 4, Mo. Anal. Chem. 33, 1719 (1961)
H. D. FRAME, JR., J . R. KUSZEWSKI, J . F. BINDER, and H. H. STRAIN, Argonne National Laboratory, Argonne, III. Anal. Chem. 33, 1741 (1961)
Flame Spectrophotometric Study of Barium The complex spectrum of barium and the effect of experimental variables on the emission intensity are investigated. The variables studied are: flow rates of oxygen and fuel, ratio of these flows, regions of the flame mantle observed, organic solvents, and the presence of various anions and cations. J. A. DEAN and J . C. BURGER, University of Tennessee, Knoxvïfle, Tenn. T. C. RAINS and H. E. ZITTEL, Oak Ridge National Laboratory, Oak Ridge, Tenn. Anal. Chem. 33, 1722 (1961)
Hydrogénation of Linolenate. Comparison of Products from Trilinolenin and Methyl Linolenate by Use of Countercurrent Distribution and Gas-Liquid Chromatography The various products formed in the hydrogénation of methyl linolenate and trilinolenin are separated by countercurrent distribution and gas-liquid chromatography. Countercurrent distribution separates the compounds into monoenes and dienes, which are subsequently separated into their various isomers by gas-liquid chromatography. C. R. SCHOLFIELD, E. P. JONES, and H. J . DUTTON, Northern Regional Research Laboratory, Peoria, III. Anal. Chem. 33, 1745 (1961)
Quantitative Study of Factors Influencing Sample Flow Rate in Flame Photometry
Determination of Menthols by Gas Chromatography
A quantitative study is made of factors affecting the sample flow rate in flame photometry. Variations of solution properties, atomizer characteristics, and atomizing gas pressure are the factors reviewed for total consumption atomizers to determine their influence on flow rate.
Gas chromatography is used for the quantitative determination of isomers of menthols in mixtures. A two column system effects the separation and determination of the four racemates involved. Application is made in the analysis of peppermint oil.
J. D. WINEFORDNER and H. W . LATZ, University of Florida, Gainesville, Fla. Anal. Chem. 33, 1727 (1961)
P. J . PORCARO and V. D. JOHNSTON, The Givaudan Corp., Dslawanna, N. J. Anal. Chem. 33, 1748 (1961) VOL. 33, NO. 12, NOVEMBER
1961
•
13 A
BRIEFS Quantitative Determination of Diaminocarboxylic Acids and Related Compounds by Rapid Paper Electrophoresis
Determination of Ethyl Hydrogen Sulfate, Diethyl Sulfate, and Sulfuric Acid in Diethyl Sulf a t e Solutions
Diaminocarboxylic acids and related compounds are deter mined by paper electrophoresis and spectrophotometry. The compounds are complexed with cupric chloride and separated by rapid paper electrophoresis; the bands are developed, and extracted with ethanol. T h e absorbances are read spectrophotometrically at 430 ηιμ.
Refractive index analysis and titration techniques are used for the determination of diethyl sulfate, ethyl hydrogen sulfate, and sulfuric acid in mixtures. The technique is valuable in the study of t h e system, ethylenesulfuric acid-ethyl hydrogen sulfate-diethyl sulfatewater-ethyl ether-ethyl alcohol.
M . A . D O R A N , The Dow Chemical C o . , Framîngham, Mass. A n a l . C h e m . 33, 1752 ( 1 9 6 1 )
Ion Exchange Method f o r Determination of 1 lsonicotinyl-2-acetylhydrazide (Acetylated Isoniazid) in Biological Fluids Ion exchange chromatography is used in the separation and determination of acetylated isoniazid in the presence of isoniazid, isonicotinic acid, and other metabolites. The column effluent is analyzed by radioisotopic or colorimetric procedures. ALFRED HELLER, J . E. KASIK, LEON CLARK, and L. J . ROTH, University of Chicago, Chicago, III. Anal. Chem. 33, 1755 (1961)
H. G. HARRIS and D. M. HIMMELBLAU, The University of Texas, Austin, Texas Anal. Chem. 33, 1764 (1961)
Determination of Oxygen by the Inert Diffusion Method Using Graphite Capsules
Gas
The oxygen content of oxides, metals, and certain organic compounds is determined by an inert gas diffusion method using graphite capsules. The sample is contained in a graphite capsule t o prolong its exposure to carbon during decomposition and to provide a miniature reaction vessel. The carbon monoxide evolved is converted to carbon dioxide and measured conductometrically. E. J. BECK and F. E. CLARK, Union Carbide Corp., Parma 30, Ohio Anal. Chem. 33, 1767 (1961)
Conductivity Method for Determination of Urea A rapid and accurate conductivity method provides for the determination of urea in solutions containing colored or interfering substances. T h e procedure is based on the difference in electrical conductivity between urea and ammonia carbonate. Results are compared with those of established methods. WEI-TSUNG C H I N and WYBE KROONTJE, Virginia Polytechnic Institute, Blaclcsburg, Va. Anal. Chem. 33, 1757 (1961)
Behavior of Substituted Aromatic Acid in Selected Nonaqueous Solvents A correlation is established between the acidic behavior of substituted benzoic acids and phenols, in various nonaqueous solvents, with their structural properties. A linear relationship between Δ Η Ν Ρ and p K , is observed. Of the acids studied, four do not exhibit normal behavior. R. R. MIRON, California Research Corp., Richmond, Calif., and D. M. HERCULES, Juniata College, Huntington, Pa. Anal. Chem. 33, 1770 (1961)
Determination of Traces of Sulfur, Fluorine, and Boron in Organic Materials by Oxygen Bomb Combustion Trace amounts of sulfur, fluorine, and boron in organic substances are determined by combustion technique using a platinum-lined Parr oxygen calorimeter. Water is added t o t h e bomb prior t o combustion and the combustion products are obtained in an aqueous solution. Microanalytical techniques are used for particular anion and cation analyses. J . J. BAILEY and D. G . GEHRING, E. I. du Pont de Nemours & Co., Inc., Gibbstown, N. J. Anal. Chem. 33, 1760 (1961)
Extraction of the Elements as Quarternary (Propyl, Butyl, and Hexyl) Amine Complexes Distribution data are obtained for 57 metallic ions in liquid-liquid extraction systems involving certain qua ternary amines and methyl isobutyl ketone. Procedures are suggested for separation of metal ions in both radio chemical and general analytical situations. W . J. MAECK, G. L. BOOMAN, M. E. KUSSY and J. E. REIN, Phillips Petroleum Co., Idaho Falls, Idaho Anal. Chem. 33, 1775 (1961)
Determination of Oxygen in Organometallic and Inorganic Compounds by a Modified Unterzaucher Method The Unterzaucher method for determining oxygen is modified to make it applicable t o organometallic and inorganic compounds. T h e formation of metallic oxides is prevented by reacting the sample with cuprous chloride in the presence of excess carbon. Good recoveries of oxygen are obtained in all analyses. MITCHELL KARPON Detroit, Mich.
and MANUEL
BRANDT,
Ethyl
Corp.,
Anal. Chem. 33, 1762 (1961)
Separation of Arsenic from Antimony and Bis muth by Solvent Extraction Arsenic ( I I I ) is rapidly and quantitatively separated from antimony and bismuth by extraction with benzene from an acid medium. T h e concentration of the acid solution is critical and must be in the range of 8 to 10 normal. Separation is checked by radioactive tracer technique. H. C. BEARD and L A. LYERLY, Florida State University, Talla hassee, Fla. Anal. Chem. 33, 1781 (1961). VOL. 33, NO. 12, NOVEMBER 1961
•
15
A
BRIEFS
new
S p e c t r o p h o t o m e t r i c Determination of Iron (III) by Means of 6-Hydroxy-l,7-phenanthroline
IMPROVED MODEL
A spectrophotometric m e t h o d is devised for determining i r o n ( I I I ) using the chelate, 6-hydroxy-l-, 7-phenanthroline dissolved in 1-propanol. Depending upon p H buf fer system, no interference is encountered from metallic ions, t a r t r a t e , citrate, thiocyanate, or phosphate. The new reagent is compared with the 8-quinolinol reaction.
GUARANTEED TO OUTPERFORM A N Y SIMILAR APPARATUS
J . M . D U S W A L T with M . G . M E L L O N , Purdue University, Lafay ette, I n d . A n a l . C h e m . 33, 1782 ( 1 9 6 1 )
Analysis o f Multicomponent M e t h y l - and Phenylchlorosilane Solutions
LABLINE
CHROMATOFUGE* ACCELERATED PAPER CHROMATOGRAPHY Accurate, definite separations in just minutes ... not hours!
A rapid mass spectrometer procedure is described for de termining m e t h y l - and phenylchlorosilanes in mixtures. T h e technique minimizes any hydrolysis error due to sample manipulation. Calibrations are based on known mixture standards. C . A . H I R T , G e n e r a l Electric C o . , W a t e r f o r d , N.Y. A n a l . C h e m . 3 3 , 1786 ( 1 9 6 1 )
Report on Recommended Specifications f o r Microchemieal A p p a r a t u s . Oxygen Combustion Flask
_^Htlti
This new report is one of a series prepared by the Com mittee on Microchemieal Apparatus. I t deals with speci fications for the conventional a p p a r a t u s used in connec tion with oxygen flask combustion procedures. Electric ignition a p p a r a t u s is not included. A L STEYERMARK, others.
Hoffman-La
Roche, Inc., Nutley,
eS**
N . J . , and
A n a l . C h e m . 3 3 , 1789 ( 1 9 6 1 )
ADVANCES IN ~])α CHEMISTRY SERIES
\ t;« r **i Μ mt
//
The**** collected papers from ACS symposia c o n d u c t e d from 1951 t h r o u g h 1953 t r e a t topics ol key concern t o c h e m i s t r y n o w . Each v o l u m e e u l s across m a n y disciplines as n o j o u r n a l issue c a n d o . Here is your o p p o r t u n i t y to s t u d y a n u m b e r of different a p proaches to a problem in relation to each athe-r.
O n e o f the most significant a d v a n c e ' s in this field! Just l o o k ! E v a p o r a t i o n no l o n g e r a p r o b l e m ; identifications a v a i l a b l e immedi ately; multiple separations run ΐ ί . : * Μ ί ;> .--.··.-.-· r simultaneously; p r e - w e t t e d p a p e r ' " ^ " ,J f c ch •'• "' ' Γ| (required f o r lipoprotein separations) will not t e a r ; t w o d i m e n s i o n a l s e p a r a t i o n s ; Rf v a l u e s r e a d i l y d e t e r m i n e d . O n l y with the m a n y exclusive f e a t u r e s i n c o r p o r a t e d into this m a c h i n e ( d e v e l o p e d a n d a p p r o v e d b y D r . H u g h J . M c D o n a l d ) is it p o s s i b l e t o d u p l i c a t e t h e a c c u r a c y , r a n g e a n d s p e e d o f the c h r o m a t o g r a p h i c s e p a r a t i o n s a c h i e v e d . W r i t e f o r full i n f o r m a t i o n .
Choose from t h i s list t h e s u b j e c t s you w a n t to i n v e s t i g a t e fur ther. No. No. No. No. No. No. No. No.
5 — P r o g r e s s in P e t r o l e u m Technology 392 p a g e s · c l o t h b o u n d $6.50 · p a p e r b o u n d $4.00 6—Azeotropic Data 328 p a g e s · c l o t h b o u n d · $5.00 7—-Agricultural Applications of P e t r o l e u m Products 104 p a g e s · p a p e r b o u n d · $2.50 8—Chemical N o m e n c l a t u r e 112 p a g e s · p a p e r b o u n d · $3.00 9—Fire R e t a r d a n t P a i n t s 91 p a g e s · p a p e r b o u n d · $2.50 10—Literature Resources f o r C h e m i c a l Process I n d u s t r i e s 582 p a g e s · p a p e r b o u n d · $7.50 11— N a t u r a l Plant Hydrocolloids 103 p a g e s · p a p e r b o u n d · $2.50 12—Use of Sugars a n d O t h e r C a r b o h y d r a t e s in t h e Food Industry 142 p a g e s · p a p e r b o u n d · $3.50
Postage: none
P a n A m e r i c a n U n i o n $0.10;
f o r e i g n $0.15;
domestic,
M o d e l 5 0 6 0 — 2 6 " W χ 3 6 " Η χ 3 0 " D. y3 HP c o n s t a n t speed motor, v a r i a b l e V - b e l t d r i v e , tachometer, timer, b r a k e , stainless s t e e l b o d y . 1 1 5 v o l t s , 6 0 c y c l e $ 1 2 9 5 . 0 0 1
P a t e n t s p e".ΰ ι η ί
The t o p L i n r.. is L A B L I N E
L
LABLINE, INC. 3070-82 W. Grand Ave., Chicago 22, III. Please send me Bulletin 35Aoon theLabline Chromatofuge Name
Order from:
Firm N a m e -
Special Issues Sales, A m e r i c a n C h e m i c a l Society, 1155 Sixteenth S t r e e t , N.W., Washington 6, D.C.
Address—
-Zone
.State-
City
Circle No. 41onReaders' Service Card VOL. 33, NO. 12, NOVEMBER 1961
•
17
A
