Contributed Articles
Physical Basis of Atomic Absorption Spectrometry. Influence of Temperature Gradients on Spatial Distribution of Neutral Atoms in the Long Pathlength Cell. Atsushi Ando, Keiichiro Fuwa, and B. L. Vallée
Electrochemical Behavior of Triphenyltin Compounds and Their Determination at Submicrogram Levels by Anodic Stripping Voltammetry. M. D. Booth and B. Fleet
Nondestructive Determination of Fluorine by Photon Activation Using a Betatron. L. Kosta and J. Slunecko
Nondestructive Determination of Platinum Metals in Ores, Matte, and Lead Assay Beads by Reactor Activation Analysis and High Resolution Gamma Spectrometry. Jacob Turkstra, P. J. Pretorius, and W. J. de Wet
Specific Spectrofluorometric Determination of Atmospheric Ozone using 2-Diphenylacetyl-l,3-lndandione-lHydrazone. Denys Amos
Liquid Anion Membrane Electrodes Sensitive to Metal Cation Concentration. G/ancar/o Scibona, Leda Mantella, and P. R. Danes/
Decision and Detection Limits for Linear Calibration Curves. Andre Hubaux and Gilbert Vos
Palladium-Hydrogen System. Efficient Interface for Gas Chromatography—Mass Spectrometry. P. G. Simmonds, G. R. Shoemake, and J. E. Lovelock
881
Practical Least Squares Approximation of Chromatog r a m s . S. M. Roberts, D. H. Wilkinson, and L. R. Walker
886
Analysis for Surface Peroxides. T. R. Heagney
894
818
825 Arthur Bradley
and
831 Identification of Impurities in α-Trinitrotoluene by Nu clear Magnetic Resonance Spectrometry. D. G. Gehring
898
835
Automated Kjeldahl Determination of Nitrogen in Pe troleum. R. N. Heistand
903
842
Numerical Deconvolution of Overlapping Stationary Electrode Polarographic Curves with an On-Line Digital Computer. W. F. Gutknecht and S. P. Perone
906
Electrochemical Oxidation of NADH Analogs. Blaedel and R. G. Haas
918
W. J.
844
Notes 849 Precision and Optimum Acidity in Complexometry. W. Budesinsky
Computer Evaluation of Continuously Scanned Mass Spectra of Gas Chromatographic Effluents. R. A. Hites and K. Biemann
Nondestructive Neutron Activation Analysis of Air Pollution Particulates. R. Dams, J. A. Robbins, K. A. Rahn, and J. W. Winchester
Ionic Hydration and Single Ion Activities in Unassociated Chloride at High Ionic Strengths. R. C. Bates, B. R. Staples, and R. A. Robinson
Preparation of Known Concentrations of Gases and Vapors with Permeation Devices Calibrated Gravimetrically. F. P. Scaringelli, A. E. O'Keefe, Ethan Rosenberg and J. P. Bell
Determination of Trace Impurities in Argon by Microwave Induced Excitation. H. E. Taylor, J. H. Gibson, and R. K. Skogerboe
B. 928
Spectrophotometric Determinations Based on the For mation of Tris-l,10-Phenanthroline Iron(ll). T. J. Bydalek, J. E. Podoski, and D. B. John
929
861
Volumetric Determination of Pyridine Bases Using Iron(lll) Hydroxide Sulfate as Indicator. Yoshio Koda
931
867
Use of Ammonium Fluoride in Determination of Zirco nium and Other Elements by Atomic Absorption Spec trometry in the Nitrous Oxide—Acetylene Flame. A. M. Bond
932
871
Preparation of Thermally Stable Gas-Chromatographic Packing Materials. A. H. Al-Taiar, J. R. Lindsay Smith, and D. J. Waddington
935
876
Application of Capillary Burners in Flame Spectrometry. K. M. Aldous, R. F. Browner, R. M. Dagnall, and T. S. West
939
855
ANALYTICAL CHEMISTRY, VOL. 42, NO. 8, JULY 1970
·
3A
Viscosity
directly
in
centipoises
Contributed Articles
HOEPPLER VISCOMETER PRECISION MODEL
Fluorometric Determination of Microgram Amounts of
Hoeppler Viscometer provides a fast, accurate method of determining viscosity of Bases, liq uids, oils, plastics, syrups, viscous tars and dark liquids. From 0°C. to 100°C. Direct readings in centipoises (or centistokes). From 0.01 to 1,000,000 centipoises. Accuracy 0 . 1 % to 0 . 5 % . Small sample (30cc) required. Results consistent and reproducible. Price $350. Interchangeable spare parts available. Write for Bulletin HV-303.
Meperidine.
L. A. Dal Cortivo,
M. M. De Mayo,
and
S. B. Weinberg
941
Indicator Titrations in Sulfolane. MADE I N U . S . A .
UBBELOHDE VISCOMETER
943
Potentiometric Analysis of Hypophosphite in Electroless Nickel Plating Baths.
on the principle of the suspended level A capillary-type viscometer for determining the kinematic vis cosity of any true viscous liquid, such as petroleum products or lubricants. See American Society for Testing Materials, A.S.T.M. designation D 2515. Measures viscosity with an e r r o r not greater than ± 0 . 1 % , when used at efflux times at 8 0 - 1 0 0 0 seconds. The smallest listed capil lary is used for light fuel oil or kerosene, the others for lubricating oils. T h e temperature of the bath should be controlled within ±0.02°F. In all capillary sizes as called for by the A.S.T.M.—calibrated or uncalibrated. Uncalibrated capillary, *S24. Calibrated, S42 Metal frame to fit capillary, $7.50. Write lor Bulletin UV-S14.
A. P. Zipp
N. Fe/dste/n, T. S. Lancsek, a n d
J. A. Amick
945
Gas-Liquid
Chromatographic
Separation
of
the
Ten
Geometric Isomers of Chromomethylaniline Using Ucon Oil a s Stationary Phase on a Textured Glass Bead Support.
Edward
Townley,
Isidoro
Perez,
and Peter
Kaba-
sakalian
947
Determination of Carbon in High Purity Metals by Photon Activation Analysis.
G. J. Lutz and L. W. Masters
Correction. Analysis of
Polyimide
948
,,,,„ ,„ c s A BARRIER AND EXCITING FILTERS FOR FLUORESCENT STUDY Standard Stock Types:
Correction.
Processed in our N e w Rochelle Optical Shop. Write for Bulletins CF-417,
UV-430
Dilution. and
Dielectric
Using Attenuated Total Reflectance.
$6.50 each, 2 χ 2" χ 1 to 3mm $7.50 each, 50mm diameter $4.50 each, 25mm diameter
ND-419.
FISH-SCHURMAN CORPORATION 7 2 Portman R o a d , N e w R o c h e l l e , Ν . Υ. 1 0 8 0 2
Coatings
R. J. McGowan
942
A c i d - B a s e Microtitrations Based on Serial
J. R. Robinson,
Honore
Stelmach,
and S. P.
Eriksen
944
Aids for Analytical Chemists
Fish-Schurman
New Sample trometer.
Introduction Technique
for
Mass
Spec-
F. G. Padrta and J. J. Donohue
950
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