FUTURE ARTICLES Hydrogen Chloride Partial Pressure of Dilute Hydrogen Chloride-Concentrated Lithium Chloride Aqueous Solutions Ε. Scarno, G. Gay, and M. Forina Machine intelligence Applied t o Chemical Systems. Pre diction and Reliability Improvement in Classification of Low Resolution Mass Spectrometry Data P. C. Jurs Potentiometric Study of Copper(l) Complexes with Uni valent Anions in Acetonitrile J. K. Seene and B. Kratochvil Application of Field Ionization t o Gas-Liquid Chromatogra phy—Mass Spectrometry Studies J . N. D a m f c o and R. P.
Barron
Selectivity in Liquid-Liquid Chromatography D. E. Martire
and D. C.
Locke
Pyrolysis Gas Chromatography of Phenyl Polymers and Phenyl Ether M. T. Jackson, Jr., and J. Q. Walker The Question of Instrumental Artifact in Linear Sweep ¥oltammetry with Positive Feedback Ohmic Drop Com pensation E. E. Wells, Jr, Time-Lapse Spectrometry in Organic Photochemistry N. Filipescu, F. L. Minn, and J. W. Pavlik Amperometric Titration of Calcium and Magnesium Using the Lead Dioxide Electrode C. Huber, K. Dannke, and F. Hinz Direct Titrimetric Determination of Selenium(IV) in Sul furic Acid Using Condensed Phosphoric as an Accelerator P. P, Naidu
Chlorine-35 Nuclear Quadrupole Resonance Studies of Trichloromethyl Compounds E. G. Brame, Jr. Double Beam Photon Counting Photometer with Dead Time Compensation K. C . Ash and E. H.
Piepmeier
Determination of Polymeric Isocyanate in the Presence of Reactive Halides P. M. Beazley Spectrophotometry Determination and Spectrophotometric Titration of Palladium. Formula for the Pd(II)-Nitroso R Complex O. W. Roi/ins and M. M. Oldham Fîuorometrîc Methods for Europium and Terbium D. E. Williams and J. C. Guyon Quantitative Cation Exchange Separation of Zirconium and Hafnium in Formic Acid Media M. Qureshi and K. Husain Lead Sulfide-lmpregnated Silicone Rubber Membranes as Selective Electrodes for Lead Ions H. Hirata and K. Date Spectrophotometric Determination of Rhodium with Nitroso R. Formula for the Rh(lll) Nitroso R Complex O . W . Rollins
and M. M,
Oldham
Determination of Nitrogen in Vanadium Nitrodes and Uranium Nitrode (UN) D. H. Bollman and D. M. Mortimore Structure Elucidation of Aliphatic Aldehydes by Mass Spectrometry of Alkenyl Ethers P. E. Manni, W. G. Andrus, and J, N. Wells Spectrophotometric Determination of Sulfide Ion with Organic Disulfides R. E. Humphrey, W. Hinze, and W. M. Jenkines III
improvement is what Staco variables are made of.
Available from Leading Distributers
PANEL OR BENCH MOUNT UNCASED MODEL
DELUXE METERED LABORATORY MODEL
FREE
STACO
WRITE FOR NEW STACO PRODUCT GUIDE 1970
We make improvements in Staco variable transformers almost every day. Last year, we made 14 major changes in these products. We improved the high thermal foundation material, the precious metal plating and the mechanical strength; just to mention a few. You might not see the difference, but it's here. We offer a wide variety of configurations with model ratings from 1 to 100 amperes. Custom designs available to meet specific requirements. Contact your local Staco distributor for complete details. Cirele Hs, 151 m Headers' Senrise Card
112 A « ANALYTICAL CHEMISTRY, VOL. 42, NO. 14, DECEMBER 1970
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