QUALITY LABORATORY APPARATUS
multi-STlR
plATes SYNCHRONIZED STIRRING . . . INDIVIDUAL SELECTIVE HEATING
Future Articles S o m e Observations on the Vaporization and A t o m i z a t i o n of S a m p l e s , U s i n g a C a r b o n F i l a m e n t Atomizer D. J. Johnson, B. L. Sharp, T. S. West, and R. M. Dagnall Atmospheric Pressure Ionization ( A P I ) M a s s S p e c t r o m e t r y . F o r m a t i o n of P h e n o x i d e I o n s f r o m Chlorinated Aromatic Compounds I. Dzidic, D. I. Carroll, R. N. Stillwell, and E. C. Horning T h e o r e t i c a l a n d E x p e r i m e n t a l I n v e s t i g a t i o n of F a c t o r s A f f e c t i n g P r e c i s i o n in M o l e c u l a r A b s o r p t i o n Spectrophotometry L. D. Rothman, S. R. Crouch, and J. D. Ingle, Jr. A p p a r a t u s for a n d A p p l i c a t i o n s of t h e D i f f e r e n t i a l Thermal G a s Analysis Nobuyasu Mizutani and Masanori Kato A p p l i c a t i o n of D i s c r e t e F o u r i e r T r a n s f o r m t o E l e c t r o n
MODEL SP-13025-SERIES 13000 120V, 1700W 50/60 HZ Complete with 4 Teflon Stir Bars and Tachometer
Thermolyne's 2 and 4 plate Multi-Stir Plate units provide synchronized stirring speed and temperature you select. There is no waiting when you have two or more
Spin Resonance Spectral Data Toshio Nishikawa and Kazuo Someno R a d i o F r e q u e n c y C a v i t y I o n S o u r c e in S o l i d s M a s s Spectrometry D. L. Donohue and W. W. Harrison
vessels to heat and/or stir. Heat-up time from ambient
M i c r o S e m i - A u t o m a t e d A n a l y s i s of S u r f a c e a n d W a s t e w a t e r s for C h e m i c a l O x y g e n D e m a n d
to 371°C without any load is 5 to 6 minutes. Tempera-
Andrea M. Jirka and Mark J. Carter
ture accuracy is ± 3 ° C . Individual safety lights alert operator when plate surface heat is 65°C or above.
M e r c u r y Film N i c k e l Minigrid Optically T r a n s p a r e n t
Each plate has its own separate temperature control.
Thin Layer Electrochemical Cell
Each top plate has an individual shaded pole motor.
William R. Heineman, Thomas P. Deangelis, and John F. Goelz
Positive-drive system with solid state speed control compensates for any change in stirring effort and
D e t e r m i n a t i o n of S u l f o n a m i d e s of P h a r m a c e u t i c a l I m p o r t a n c e by Catalytic T h e r m o m e t r i c Titration
eliminates downtime due to belt problems. White
Edward J. Greenhow and Leslie E. Spencer
Nucerite® coated plates provide improved visibility of fluid being stirred. Ideally suited for industrial, educa-
M o d e r n Liquid C h r o m a t o g r a p h y on Spherosil
tional and medical lab procedures.
J. Vermont, M. Deleuil, A. J. de Vries, and C. L. Guillemin
Write for new Laboratory Apparatus Catalog #500 MODEL SP-13125 SERIES 13100 120V, 125W 50/60 HZ Complete with 2 Teflon Stir Bars
M e t h o d s of F a c t o r A n a l y s i s of M a s s S p e c t r a R. W. Rozett and E. McLaughlin Petersen G a s C h r o m a t o g r a p h i c D e t e r m i n a t i o n of A p o m o r p h i n e in U r i n e a n d F e c e s Robert V. Smith and Andrew W. Stocklinski Q u a n t i t a t i v e M e t a b o l i c Profiling of U r i n a r y O r g a n i c Acids by Gas C h r o m a t o g r a p h y - M a s s Spectrometry. C o m p a r i s o n of I s o l a t i o n M e t h o d s J. A. Thompson and S. P. Markey N o r m a l Pulse Polarographic Analysis B a s e d on M e r c u r y Anodization: Sulfide a n d Iodide J. Turner, R. Abel, and R. Osteryoung C h r o m a t o g r a p h i c D e t e r m i n a t i o n of P h e n o l s in W a t e r Colin D. Chriswell, Richard C. Chang, and James S. Fritz
®THERMOLYNE SYBRON CORPORATION 2555 KERPER BOULEVARD, DUBUQUE, IOWA 52001
Exploding W i r e s as an Intense Ultraviolet Continuum Excitation S o u r c e with Preliminary Application to Atomic Fluorescence Spectrometry D. W. Brinkman and Richard D. Sacks
CIRCLE 223 ON READER SERVICE CARD 728 A · ANALYTICAL CHEMISTRY, VOL. 47, NO. 7, JUNE 1975
