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
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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,
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N . J . , and
A n a l . C h e m . 3 3 , 1789 ( 1 9 6 1 )
ADVANCES IN ~])α CHEMISTRY SERIES
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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
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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
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