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
