Air Products and Chemicals, Inc.

NOW a "plug-in, fine- tune, and forget" liquid helium transfer and cooling sgstem. * , Jp| This Cryo-Tip® refrigerator now makes it possible to transfer liquid helium, cool a sample and control temperature to 0.01° Κ with one compact, easily-installed system. This device has its own micrometer needle valve and heater for precise adjustment from 2°K to 300°K. Its six-foot flexible line and miniature refrigerator allow quick installation and cooldown in all analytical instruments. Your sample can be held in any orientation. Cumbersome set-up and filling of research dewars can be forgotten. Get all the detailed facts on Model LT-3-110 for your particular application. Air Products and Chemicals, Inc., Advanced Products Department, Allentown, Pa. 18105. Telephone (215) 395-8355. FUTURE ARTICLES Compound Identification by Computer Matching of Low Resolution Mass Spectra B. A. Knock, I. C. Smith, D. E. Wright, R. G. Ridley, and W. Kelly Use of a Modification of the Debye-HUckel Equation to Calculate Activity Coefficients from Measured Activities in Electrolyte Solutions G. W. Neff Diffraction Analysis of Solid Solutions L. K. Frevef Reversed Liquid-Liquid Partition in the Determination of Poly-Chlorinated-Biphenyl and Chlorinated Pesticides B. Ahling and S. Jensen Application of Correction Equations for Sample Interac- tions in Complex Autoanalyzer Methods H. S. Strickler, P. J. Stanchak, and J. J. Maydak Determination of Oxygen in Silicon in the Sub-Part-Per Million Range by Changed-Particle Activation Analysis E. A. Schweikert and H. L. Rook A Spectrophotometry Kinetic Study of the Formation of β-12-Molybdosilic Acid L. G. Hargis A Spectrophotometric Study of the Formation and Reduc- tion of α-12-Molybdosilicic Acid L. G. Hargis Thorium(IV) Adducts of 8-Quinolinol and Derivatives J. Abraham and A. Corsini A Study of the Scavenger Properties of Manganese(IV) Oxide with Atomic Absorption Spectrometry. The Deter- mination of Microgram Quantities of Antimony, Bismuth, Lead, and Tin in Nickel Κ. E. Burke Determination of Microgram Quantities of Water in Organic Solvents and Electrolytes by the Lead Tetraacetate Method C. D. Thompson, F. D. Bogar, and R. T. Foley Determination of Trace Amounts of Sulfur by Atomic Ab- sorption and Emission Spectrometry H. E. Taylor, J. H. Gibson, and R. K. Skogerboe Atomic Absorption Analysis by Flameless Atomization in a Controlled Atmosphere H. M. Donega and T. E. Burgess Variable Selectivity Stationary Phases for Gas Chromatography R. Ann/no and P. F. McCrea Determination of the Number and the Nature of the End Groups Polyvinylchloride M. Carrega, C. Bonnebat, and G. Zednik Determination of Blood Ammonium by Derivative Spectrometry R. N. Hager, Jr., D. R. Clarkson, and J. Savory Advantages of a Dual Column (Packed and Capillary Col- umns in Series) for Gas Chromatographic Analysis J. 0. Walker and C. J. Wolf Autocatalysis of the Kinetic Wave of Acetylacetone in Acetonitrile Solvent T. E. Neal and R. W. Murray 130 A . ANALYTICAL CHEMISTRY, VOL. 42, NO. 12, OCTOBER 1970 <^fof*ocÎuc&- Circle No. 60 on Readers' Service Card

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Page 1: Air Products and Chemicals, Inc.

NOW a "plug-in, fine-tune, and forget"

liquid helium transfer and cooling

sgstem.

* , Jp| This Cryo-Tip® re f r igera tor n o w makes it possible to transfer liquid helium, cool a sample and control temperature to 0.01° Κ with one compact, easily-installed system. This device has its own micrometer needle valve and heater for precise adjustment from 2°K to 300°K. Its six-foot flexible line and miniature refrigerator allow quick installation and cooldown in all analytical instruments. Your sample can be held in any orientation. Cumbersome set-up and filling of research dewars can be forgotten. Get all the detailed facts on Model LT-3-110 for your particular application. Air Products and Chemicals, Inc., Advanced Products Department, Allentown, Pa. 18105. Telephone (215) 395-8355.

FUTURE ARTICLES

Compound Identification by Computer Matching of Low Resolution Mass Spectra B. A. Knock, I. C. Smith, D. E. Wright, R. G. Ridley, and W. Kelly

Use of a Modification of the Debye-HUckel Equation to Calculate Activity Coefficients from Measured Activities in Electrolyte Solutions G. W. Neff

Diffraction Analysis of Solid Solutions L. K. Frevef

Reversed Liquid-Liquid Partition in the Determination of Poly-Chlorinated-Biphenyl and Chlorinated Pesticides B. Ahling and S. Jensen

Application of Correction Equations for Sample Interactions in Complex Autoanalyzer Methods H. S. Strickler, P. J. Stanchak, and J. J. Maydak

Determination of Oxygen in Silicon in the Sub-Part-Per Million Range by Changed-Particle Activation Analysis E. A. Schweikert and H. L. Rook

A Spectrophotometry Kinetic Study of the Formation of β-12-Molybdosilic Acid L. G. Hargis

A Spectrophotometric Study of the Formation and Reduction of α-12-Molybdosilicic Acid L. G. Hargis

Thorium(IV) Adducts of 8-Quinolinol and Derivatives J. Abraham and A. Corsini

A Study of the Scavenger Properties of Manganese(IV) Oxide with Atomic Absorption Spectrometry. The Determination of Microgram Quantities of Antimony, Bismuth, Lead, and Tin in Nickel Κ. E. Burke

Determination of Microgram Quantities of Water in Organic Solvents and Electrolytes by the Lead Tetraacetate Method C. D. Thompson, F. D. Bogar, and R. T. Foley

Determination of Trace Amounts of Sulfur by Atomic Absorption and Emission Spectrometry H. E. Taylor, J. H. Gibson, and R. K. Skogerboe

Atomic Absorption Analysis by Flameless Atomization in a Controlled Atmosphere H. M. Donega and T. E. Burgess

Variable Selectivity Stationary Phases for Gas Chromatography R. Ann/no and P. F. McCrea

Determination of the Number and the Nature of the End Groups Polyvinylchloride M. Carrega, C. Bonnebat, and G. Zednik

Determination of Blood Ammonium by Derivative Spectrometry R. N. Hager, Jr., D. R. Clarkson, and J. Savory

Advantages of a Dual Column (Packed and Capillary Columns in Series) for Gas Chromatographic Analysis J. 0 . Walker and C. J. Wolf

Autocatalysis of the Kinetic Wave of Acetylacetone in Acetonitrile Solvent T. E. Neal and R. W. Murray

130 A . ANALYTICAL CHEMISTRY, VOL. 42, NO. 12, OCTOBER 1970

<^fof*ocÎuc&-Circle No. 60 on Readers' Service Card