^TJTOnULATTIC ΈΖΉ1C ORTDTISTGΤ
Τ Π Γ ΤΡΡ Α Τ" 1 Γ^ Τ Ρ MODEL.
A.T-S-A. T y p i c a l Variable p H T i t r a t i o n
All potentiometric titrations performed automatically! • Automatic recording pH-stat. • Record v a r i a t i o n in pH o r EMF as a f u n c t i o n of t i t r a n t added. • T i t r a t e t o a n y preset e n d p o i n t . • Record f i r s t a n d s e c o n d derivative titration curve. • A u t o m a t i c t i t r a t i o n in a q u e o u s or n o n a q u e o u s m e d i a : Acid-base reactions — Oxidation-reduction reactions — Precipitation reactions — Complex-ion reactions —
Typical Constant pH Titration
• K i n e t i c analysis w i t h p e r m a nent record of r e a c t i o n rate. • A u t o m a t e d q u a l i t y c o n t r o l of laboratory, pilot plant or i n d u s t r i a l processes. FEATURES • Built-in s i m u l a t e d signal t o check t i t r a t o r ' s response. • P r o p o r t i o n a l t i t r a n t a d d i t i o n as e n d - p o i n t is a p p r o a c h e d .
Typical First Derivative Titration
• T i t r a n t delivery rate a n d c h a r t speed are b o t h v a r i a b l e . • Automatic cutoff permits unattended operation. • Interchangeable burets for micro and m a c r o t i t r a t i o n s . • Provision f o r a Polarad plug-in d i f f e r e n t i a t o r . Shows pH (on t h e m e t e r ) as recorder plots f i r s t o r s e c o n d derivative. • C o n t i n u o u s l y v a r i a b l e recorder span — m a x i m u m s e n s i t i v i t y f u l l span 2 pH u n i t s . • A c c u r a c y ± 0 . 0 2 pH u n i t s o r ± 1 . 2 millivolts. Now, t e d i o u s p o t e n t i o m e t r i c t i t r a t i o n s t h a t r e q u i r e d t i m e - c o n s u m i n g point-byp o i n t analysis c a n be d o n e a u t o m a t i c a l l y . T h e new Model AT-2A A u t o m a t i c R e c o r d i n g Titrator makes variable and constant pH titrations automatically, simultaneously p r o v i d i n g a p e r m a n e n t r e c o r d . This new instrument will free chemists for more p r o d u c t i v e analyses as it s p e e d s r o u t i n e but difficult measurements. ? = i o . s
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INTRINSIC VISCOSITY DETERMINATION FOR A TYPICAL HIGH POLYMER EXPERIMENTAL
VISCOSITY
VS SHEAR RATE
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by EÎSETTJ
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BUSINESS REPLY CARD Fir»! Clou Permit No. IS, tone Wand Cuy 1, N.¥.
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POLARAD
«t.. Long tatand Otty f. H. V.
Values of reduced viscosity were obtained directly without extra polation to zero shear gradient. The lower curve is'typical of the error to be expected when appar ent viscosity is obtained at the high and nonuniform shear rate implicit in the capillary method.
Specifications: Shear Stress Range: 0.002 dyne/cm^ to 1.6 dyne/cm 2 . Shear Rate Range: 0.2 sec-' to 50 sec-1. in 26 steps. Viscosity Range: Up to 800 centipoise at 0.2 sec-1. Accuracy: ± 0.5% of sample viscosity. Cylinder Temperature: Constant to within 0.05°C of desired temperature when located in a temperature-controlled (±2°C) room.
SCIENTIFIC i3srsTR,Tj3sd:HiisrT3 POLARAD *l-BCTMONtCe CORP
7SP Here reduced viscosity ~~fr , s extrapolated to zero concentration to obtain intrinsic viscosity [ ? J β=0.
FREE LIFETIME SERVICE ON ALL POLARAD INSTRUMENTS
SCIENTIFIC INSTRUMENTS A DIVISION OF POLARAD ELECTRONICS CORPORATION
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