1 Complete Source ...for over 600 stocked IR spectrophotometer accessories. Barrirr* Infrared Analytical Accessor*»*
New Products matically determines percent element concentration. Applications include pro duction quality control of steel, glass, and cement; materials inspection and analysis; analyzing manufacturing pro cesses such as soldering and plating; and applications in mineralogy, plastics, and electronics. Diano Corp. 412
Pulsed NMR Modules It makes good sense to deal with a single accessory sup plier when he can deliver the products you want, when you want them, at industry's most attractive prices. Barnes can do just that. Our new catalog lists over 600 spectrophotometer acces sories . . . crystals, liquid, gas and solid sampling products, and many others. All are designed with traditional Barnes precision to serve your most critical requirements, and may be used with any type of spectrophotometer, including Beckman, Perkin-Elmer, or Varian. The catalog is arranged to simplify your ordering, save your time, and provide a single source for your analytical accessory needs. What's more, Barnes ships promptly after receipt of your order. Write or phone for your 40-page single source catalog today, "Barnes Infrared Analytical Accessories." Barnes Engineering Company, 30 Commerce Road, Stamford, Connecticut 06904. Call toll free (800) 243-3498, Ext. 281, or in Connecticut (203) 348-5381 Ext. 281.
BARNES
Your IR Spectroscopy Source. CIRCLE 30 ON READER SERVICE CARD
QUALITY LABORATORY APPARATUS
modulAR dRi-bATh DIAL YOUR TEMPERATURE . . . AMBIENT TO 110°C
All modules may be used for variable frequencies in the range 4 - 6 0 MHz and include receivers, programmers, oscil lators, and amplifiers up to 2500 W. These modules can be combined to form complete spectrometers with exact specifications according to the customer's requirements. A feature of the equipment is the handling of very long pulses without significant droop, thus enabling 7Ί ρ measurements to be made with all of the standard modules. Polaron Instruments, Inc. 415
Secondary Ion Mass Spectrometer Model 2500 consists of a quadrupole mass spectrometer with energy prefilter, an ion bombardment system, and the electronic controls required to ob tain positive and negative SIMS data. The ion bombardment system includes an ion gun capable of delivering a fo cused beam of ions to the sample in ei ther a static or a rastered mode. Ras ter-gating is included for improved SIMS depth profiling capability. The en ergy filter prevents high-energy ions and neutral particles from entering the quadrupole, thereby increasing the sys tem signal-to-noise ratio. The quadru pole and filter in combination enable better than unit mass resolution throughout the mass range of 1-300 AMU. Physical Electronics Industries, Inc. 416
Three Block DB 16500
The Modular Dri-Bath has been designed for the flexibility and accuracy required to perform a variety of lab procedures. Seven interchangeable heating blocks can accommodate standard test tube sizes (6mm to 25mm). Accurate temperature adjustment made by turning control knob . . . uni formity of temperature +.1°C. Also available in Single Block Design . . . accuracy of ±.5°C from ambient to 110°C. Both quality-built units are attractive, compact and offer plug-in portability. Write for Laboratory Apparatus Catalog #600.
THERMOLYNE
SYBRON CORPORATION 2555 KERPER BOULEVARD, DUBUQUE, IOWA 52001
CIRCLE 199 ON READER SERVICE CARD 688 A · ANALYTICAL CHEMISTRY, VOL. 48, NO. 8, JULY 1976
Model MA-030 mass marker for time-of-flight mass spectrometers displays the mass num ber with large characters in tenths of an amu. The unit supplies a discrete mark every 1 amu, a higher amplitude mark every 10 amu, and the highest amplitude mark every 100 amu. The MA-030 also affords extremely high stability for long-term reliability of readout and is ac curate to within ±0.1 amu. CVC Products Inc. 405
At the LC Connection,take the Rheodyne trip.
New Products
M o d e l 70-10 with actuator M o d e l 7120
Type 5 0
O u r v a l v e s , s a m p l e i n j e c t o r s a n d accessories g i v e l i q u i d c h r o m a t o g r a p h y p r a c t i t i o n e r s t h e best t r i p . T h e y o f f e r a n o p t i m u m c o m b i n a t i o n of p e r f o r m a n c e , p r e c i s i o n a n d p r i c e . H e r e ' s w h a t w e g i v e y o u f o r a b e t t e r LC t r i p .
Model CSO-142 liquid composite sampler features the solid-state crystal-controlled FTS-200 flow/time interval sampler controller, PP-80 pumping system, and PR-200A auto matic backflush pump reverse control system. The sampler controller has a selector switch which permits either flow proportional (1000-99 000 gal in 1000-gal steps) or time interval sampling (1-99 min in 1-min steps). The sample pumping system has a direct drive, constant-speed synchronous motor, and a high-volume 3 / 8 -in. i.d. tubing pump. At the completion of the sampling cycle, the PR200A reverses the pump evacuating the line of all liquid to ensure sample freshness. Fluid Kinetics Inc. 406
Type 5 0 Teflon Rotary Valves For half t h e cost y o u ' r e u s e d t o p a y i n g , R h e o d y n e offers y o u t h e s a m e p e r f o r m a n c e . O u r v a l v e s a r e c h e m i c a l l y i n e r t . O n l y Teflon t o u c h e s t h e s t r e a m . T h e y f e a t u r e zero d e a d v o l u m e a n d c a n be u s e d in m a n u a l o r a u t o m a t i c m o d e s . T h r e e , f o u r a n d six w a y v a l v e s i n 0 . 8 m m a n d 1.5 m m b o r e s are a v a i l a b l e in prices r a n g i n g f r o m $ 7 0 t o $ 8 7 .
Easy to turn H PLC valve, $ 2 9 0 R h e o d y n e ' s 7 0 - 1 0 is a c o n v e n t i o n a l 6 p o r t r e m o v a b l e s a m p l e l o o p v a l v e c a p a b l e o f w i t h s t a n d i n g 7 0 0 0 p s i . V a l v e c o n s t r u c t i o n f e a t u r e s a f l a t face rotor to reduce o p e r a t i n g t o r q u e a n d simplify service. A n accessory loop filler p o r t c a n be u s e d t o m i n i m i z e w a s t a g e . Basic u n i t c o m e s w i t h 2 0 μΙ s a m p l e l o o p . 1 0 , 5 0 , 1 0 0 , 2 0 0 , 5 0 0 a n d 1 0 0 0 μ! l o o p s a v a i l a b l e . G o t w o w a y s w i t h this valve Use the R h e o d y n e M o d e l 7 1 2 0 Syringe Loading S a m p l e Injector Valve to fill l o o p s c o n v e n t i o n a l l y f o r m a x i m u m p r e c i s i o n o r i n t h e p a r t i a l l o o p v a r i a b l e v o l u m e m o d e w i t h o n l y 0 . 5 μΙ s a m p l e loss. You h a v e m a x i m u m v e r s a t i l i t y i n Η PLC s a m p l e i n j e c t i o n . L o a d t h e s a m p l e by syringe t h r o u g h the built-in needle port. W o r k s u p to 7 0 0 0 psi. Price o f t h e M o d e l 7 1 2 0 w i t h a 2 0 μΙ s a m p l e l o o p is $ 4 9 0 . S a m p l e l o o p s o f 1 0 μΙ t o 1 m l are o f f e r e d . A n d accessories too A c c e s s o r i e s i n c l u d e a p n e u m a t i c a c t u a t o r f o r Η PLC v a l v e s , h i g h p r e s s u r e s w i t c h i n g valves, t u b e fittings a n d valve m o u n t i n g plates. R e a s o n e n o u g h to m a k e t h e R h e o d y n e trip? J u s t t o b e s u r e , ask us f o r o u r n e w series of d a t a s h e e t s t o g e t h e r w i t h f u l l o r d e r i n g i n f o r m a t i o n . Call o r w r i t e R h e o d y n e , 2 8 0 9 - 1 0 t h S t . , Berkeley, C a l i f o r n i a 9 4 7 1 0 . P h o n e (415) 5 4 8 - 5 3 7 4
RHEODYNE CIRCLE 184 ON READER SERVICE CARD 690 A · ANALYTICAL CHEMISTRY, VOL. 48, NO. 8, JULY 1976
Chemicals Standard Solutions F o u r t e e n solutions m o s t f r e q u e n t l y used as standards or titrants in t h e industrial laboratory m e e t stringent c o n c e n t r a t i o n s p e c i f i c a t i o n and a r e c o n t r o l l e d for k e y t r a c e i m p u r i t i e s w i t h their a n a l y t i c a l v a l u e s r e p o r t e d on t h e l a b e l . T h e s e i n clude c o n v e n i e n t n o r m a l i t i e s of h y d r o c h l o r i c a n d sulfuric a c i d s , s o d i u m and p o t a s s i u m h y d r o x i d e s , p o t a s s i u m per m a n g a n a t e , silver nitrate, and s o d i u m t h i o s u l f a t e . They a r e a v a i l a b l e in a c h o i c e of 16-oz, 3 2 - o z , or 1-gal PolyC u b e c o n t a i n e r s . J . T. B a k e r C h e m i c a l Co. 420
Chemicals for Density Gradient Centrifugation Included in t h e n e w line of c h e m i c a l s are sucrose, cesium acetate, cesium b r o m i d e , c e s i u m c h l o r i d e , c e s i u m io dide, c e s i u m f o r m a t e , c e s i u m s u l f a t e , rubidium bromide, rubidium chloride, and s c i n t i l l a t i o n - g r a d e c e s i u m c h l o r i d e . They a r e ultrapure and f r e e f r o m o p t i c a l i n t e r f e r e n c e as r e q u i r e d for density g r a dient d e t e r m i n a t i o n s . B e c k m a n Instru m e n t s , Inc. 421
For m o r e i n f o r m a t i o n on listed i t e m s , circle the appropriate n u m b e r s on o n e of o u r R e a d e r s ' S e r v i c e C a r d s
