ANALYTICAL CHEMISTRY M a r c h
NEWS
1 9 5 7
Miami Meeting Features Strong Analytical Program ACS analytical program includes symposia on analysis in petroleum geochemistry and pesticide residues and honors to Muller and Yoe
A
STRONG technical program a t a world-renowned resort, Miami, is a major a t t r a c t i o n for analysts a t t h e 131st n a -
tional meeting
of t h e A M E R I C A N C H E M I C A L SOCIETY t o b e
held April 7 t o 12. T h e program of 125 papers will include such highlights a s the Beckman Award Symposium honoring Ralph H . Millier, the Fisher Award Symposium honoring J o h n H . Yoe, a symposium on Analytical Contributions t o Research in P e t r o leum Geochemistry, held jointly with t h e Division of Petroleum Chemistry, a n d a symposium on M e t h o d s for Analysis of Pesticide Residues, held jointly with t h e Division of Agricultural a n d Food Chemistry. Another highlight will b e t h e divisional dinner which will feature Paul M . Gross, vice president, D u k e University, as speaker. T h e final program of t h e Division of Analytical Chemistry appears below. T h e complete program for t h e 131st national A C S meeting appeared in t h e F e b r u a r y 18 issue of Chemical and Engineering ATews.
3:25— 15.
chemical Behavior of Aromatic iV-Nitrosohydroxy lamines. 3:45— 16. FRANCIS E . CRANE. Potentiometric Determination of Tetraphenylborate with Silver Nitrate. 4 : 0 5 — 17.
9:00—20. 9:10— 2 1 .
22.
10:00— 23.
9:30— 9:50— 10:10— 10:25-
10:40— 10:55 11:00— 11:10— 11 :50 -
GILBERT
F.
KINNEY
Instrumental
AND R.
A.
REINHARDT.
Operational Analogs for Kinetic Studies. 7. SEYMOUR T. ZENCHELSKY. Derivative Thermometric Titrations. Recess 8. R. L. GARMAN. Introduction of Beckman Award Medalist. 9. RALPH H. MULLER. (Beckman Award in Chemical Instrumentation address). Adventures in Instrumentation. Discussion
2:00— 10.
2:20— 11.
CLEMENT CAMPBELL AND SAUL GORDON.
Differ-
ential Thermoanalytical Techniques. mentation and Applications.
Instru-
BENJAMIN
CARROLL,
HAROLD
E L I S. FREEMAN. Rony electric Polarimetry. 2:40— 12.
R.T.Hall.
Introductory Remarks.
JAMES
S.
PARSONS.
for Photo-
E L I S. FREEMAN AND BENJAMIN CARROLL.
2:20— 29.
M A X W E L L L. C L U E T T AND J O H N H. Y O E .
M.
RUSH,
Spectro-
NELSON, AND
Spectro-
EDGAR L. STEELE AND JOHN H. Y O E .
New Class
Tuesday Afternoon GENERAL GORDON O . GUERRANT, Presiding 2:35— 30. JAMES C. STERNBERG. Simplification ol Calculations in Spectrophotometric Analysis of Multicomponent Systems. 2:55— 31.
M. F . KRANC, D . KADAVY, AND H. GARRIGAN.
Differential Spectrophotometric Phthalocvanine Blue Base. 3:20— 32.
Analysis
BURTON F . P E A S E AND M A X B. WILLIAMS.
of
Spec-
trophotometric Investigation of the Analytical Reagent l-(2-Pyridvlazo)-2-naphthol, PAN, and Its Copper Chelate.' 3 : 3 5 — 33.
TAFT
Y.
TORIBARA,
RUTH
S.
HELLARD, AND
Determination of Beryl-
lium in Biological Material.
Monday Afternoon
3:50— 34.
GENERAL 3:00— 13. R. P. CHAPMAN. COLLYER,
Introductory Remarks. P . B . M O S E L E Y , AND R.
R. B . PENLAND, E. P . BERTIN, S. MIZUSHIMA, BROTHER COLUMBA CURRAN, AND J. V. QUAG-
LIANO. Absorption Spectra of Cobalt(III) Amine Complexes Containing Some] Coordinated Anions.
R. P. CHAPMAN, Presiding W.
FREDERICK
E V E R E T T C. COGBILL AND JOHN H. Y O E .
PRISCILLA A. D E W E Y .
P.
Membrane
of Organic Reagents for Spectrophotometric Determination of Trace Amounts of Osmium.
Mag-
netic Transmission-Type Continuously Recording Testut Thermobalance.
3 : 0 5 — 14.
Permselective
Theory and Analytical Applications.
photometric Determination of Boron in Plant Tissue with Derivatives of AnthranifVn and Chrysazin. 11:05— Recess. 11:10— 20. THOMAS, B. CRUMPLER. John Howe Yoe, Teacher and Investigator. 11:25— 27. JOHN H. Y O E . (Fisher Award in Analytical Chemistry Address). Colorimetric Analysis with Organic Reagents. 2:00— 28. D . M. ROSIE AND R. L. GROB. Thermal Conductivity Behavior and I t s Importance in Quantitative Gas Chromatography.
B . T I L L E M , AND
Method
Deter-
photometric Method for Determination of Submicrogram Amounts of Nickel in Human Blood.
10:45— 25.
Methods of Derivative Polarography. 3. HAROLD H. STRAIN. Simple Apparatus for Continuous Electrochromatography. 4. VAN ZANDT WILLIAMS. Infrared Spectrophotometer for the Organic Chemist. 5. CLEMENT J. RODDEN. Automatic Determination of Uranium in Process Streams. 6.
MULLER.
K U R T A. KRAUS. Anion Exchange Studies of a Number of Elements of Groups I I I , IV, and V in HC1 and HC1-HF Solutions.
Introductory Remarks.
D . J. F I S H E R AND M. T. K E L L E Y .
H.
A. D . M A Y N E S AND W. A. E. M C B R Y D E .
10:25— 24. RICHARD
BECKMAN AWARD SYMPOSIUM HONORING RALPH H. MÜLLER R. L. GARMAN, Presiding 1. K. L. GARMAN.
AND R A L P H
mination of Traces of Lead in Igneous Minerals. Electrodes.
Monday Morning and Afternoon, April 8
2.
GLICKSTEIN
Tuesday Morning and Afternoon FISHER AWARD SYMPOSIUM HONORING JOHN H. YOE R. T. HALL, Presiding
R. P. CHAPMAN, Chairman; WARREN W. BRANDT, Secretory
9:10—
JOSEPH
Automatic Integrator for Coulometric Analysis. 1:20— 18. C . A . G E N G E . Mass Spectrometry Analysis of t h e Methyl Esters of Tall Oil F a t t y Acids. 4:40— 19. EDWARD L. SIMONS. Automatic Cryoscopic D e termination of Molecular Weights.
9:35-
PROGRAM
9:00--
P H I L I P J. ELVING AND EDWARD C. OLSON. Electro-
4:10— H.
OSBORN. New Differential Refractometer and Its Application to Chromatography.
35.
H E N R Y J. H O E N E S , J R . , AND K. G. STONE.
Bis-
(a-benzoinoximo)-dioxomolybdenum(VI) as a Weighing Form for Determination of Molybdenum. VOL. 29, NO. 3, MARCH 1957
•
29 A
NEWS 4:30— 36.
GLEN
A.
THOMMES
AND ELMER
GENERAL
LEININGEB.
Fluorometrie Determination of o- and m-Hydroxybenzoic Acids in Mixtures. 4:45— 37.
L o u i s SILVERMAN AND RACHEL L. SEITZ.
Deter
mination of Microgram Amounts of Cobalt in Sodium by 2-Nitroso-l-naphthol.
3:05
SYMPOSIUM O N ANALYTICAL CONTRIBUTIONS TO RESEARCH IN PETROLEUM GEOCHEMISTRY (Joint with Division of Petroleum Chemistry) NELSON P. STEVENS, Presiding 9:00— 38. NELSON P . STEVENS. Introductory Remarks. WILSON L. O E R AND J O H N R. GRADY.
tive Determination of Chlorophyll in Marine Sediments. H. N . D U N N I N G AND J. W. MOORE. GORDON
W.
Analytical
HODGSON AND B R U C E L.
BAKER.
Vanadium, Nickel, and Porphyrins in the Thermal Geochemistry of Petroleum. 10:15— 42. R. J. GRABOWSKI. Spectrochemical Analysis of Petroleum. 10:35— 43.
E . D . Evans, G. S. K E N N Y , W. G. MEINSCHEIN,
AND Ε . Ε . BRAY. Separations of Saturated Hydrocarbons Extracted from Recent Marine Sediments. 10:55— 44. Μ . C. BRENNEMAN. Studies of t h e Carbon Number Distribution of «-Paraffins from Quater nary Sediments. 11:15— 45. J. P . FORSMAN AND J. M. Hunt. Analytical Techniques in the Separation of Organic Matter from Rocks. 11:35— 4ti. G. 0 . GUERRANT. Ultramicromethod for Molec ular Weight Determination. Wednesday Morning SECTION Β GENERAL JOHN Η. ΥΟΕ, Presiding 9:00— 47. G. G. LONG AND A. H. GROPP. raphy. 9:15—
48.
JAMES F . MILLER.
Anodic Polarog-
Polarographic Determination
of Lead in Sodium Acetate-Acetic Acid System. 9:30— 49.
I. ROSENTHAL, G. J. FRISONE AND R. J. L A C O S T E .
Polarographic Behavior of l,l-Di-j»-chlorophenyl1,2,2,2-tetrachloroethane. 9:50— 50. W. S. LYON. Method for Determination of Neptunium-239 Counting Efficiency. 10:05— 5 1 .
ARNO H.
A. H E Y N AND HARMON L.
Separation of Magnesium from Potassium. A Tracer Study. 10:30— 52.
FINSTON.
Sodium and
D U A N E N. SUNDERMAN AND W. W A Y N E M E I N K E .
Radiochemical Separations of Silver. 10:45— 53. E. RICHARD NIGHTINGALE, J R . Poised Oxidation Reduction Systems. Quantitative Evaluation of Redox Poising Capacity and I t s Relation to the Feasibility of Redox Titrations. 11:20— 54. ALAN F . CLIFFORD. Prediction of Solubility Product Constants. 11:40— 55.
60.
G L E N N L. BOOMAN, M A X I N E C. ELLIOTT, R O B E R T B. KIMBALL, F R E D O. CARTAN, AND JAMES E.
R E I N . Determination of Free Acid in the Pres ence of Hydrolyzable Ions.
SYMPOSIUM O N ANALYTICAL CONTRIBUTIONS TO RESEARCH I N PETROLEUM GEOCHEMISTRY (Joint with Division of Petroleum Chemistry) NELSON P. STEVENS, Presiding 2:00— 56. M A X BLUMER. Removal of Elemental Sulfur from Hydrocarbon Fractions. 57.
J O H N S. BALL AND Η . Μ. SMITH.
3:25
4:00— 62.
•
ANALYTICAL CHEMISTRY
JAMES S. FRITZ,
WILLIAM J.
BYSTROFF.
LANE,
Complexometric
AND ANN
Titrations
FRANK E. CRITCHFIELD AND JAMES B . JOHNSON.
Aliphatic Primary Amino Nitrogen Compounds. Determination by Reaction With 2,4-Pentanedione. 4:15—
63.
C.
EUGENIC
BENNETT
AND F .
J.
DEBBRECHT.
A Rapid Method for Organic Halogen Analysis. 4:35— 64. A. J. MARTIN. Potentiometric Titration of Halide Mixtures. 4:50— Divisional Business Meeting for Members. 6:30— Divisional Dinner. Speaker. PAUL M. GROSS, Vice President, Duke University. Thursday Morning and Afternoon SYMPOSIUM O N METHODS FOR ANALYSIS OF PESTICIDE RESIDUES (Joint with Division of Agricultural Food Chemistry)
and
LOUIS LYKKEN, Presiding 9:00— 65. Louis LYKKEX. Introductory Remarks. 9:05— 66. F . A. GUNTHER. Development and Status of Modern Analytical Methods for Pesticide Residues in Crops and in Foods. 9:25— 67. T. II. HARRIS. Analytical Method and Residue Data Requirements for Federal Registration of Pesticide Formulations. 9:45— 68. J. A. NOONE. Residue Determinations, a Limit ing Factor in Pesticide Usage. 10:05— 69. C. Η. VAN MIDDELEM. Some Basic Principles Involved in Obtaining Valid, Useful Pesticide Residue Data. 10:25— 70.
Louis LYKKEN,
L. E. MITCHELL,
AND S. M.
WOOGERD. Important Considerations in Collect ing and Preparing Samples for Residue Analysis. 10:45— 71. J. M. BANN. Extraction and Cleanup Techniques in Residue Analysis. 11:05— 72. R. H. CARTER. Determination of Organic Chlo rine Residues Resulting from Insecticide Applica tions. 11:25 — 73. M. S. SCHECHTER. Colorimetric Methods for the Determination of Pesticide Residues. 11:45— Discussion C. H. VAN MIDDELEM, Presiding 2:00— 74. C. H. VAN MIDDELEM. Introductory Remarks. 2:05— 75. P . A. GIANG. Enzymatic Methods for Analysis of Organophosphorus Insecticides. 2:25— 76. J. E. D E W E Y . Utility of Bioassay in Determina tion of Pesticide Residues. 2:45— 77. G. E . POLLARD. Application of Infrared Spectro photometry to Determination of Pesticide Resi dues. 3:05— 78.
H. P. BURCHEIELD AND P . H. SCHULDT.
3:25—
tions of Zincke Reaction to Analysis of Pesticides Containing Active Halogen Atoms. Discussion.
3:35— 79.
J. R. L A N E , D . K. GULLSTROM, AND J. E. N E W E L L .
Applica
Adaptation of Residue Methods to Include New Vegetables or to Extend the Sensitivity Range. Extension of Residue Methods for Maleie Hydrazide and Alanap. 3:50— 80.
J. M. B A N N , S. C. L A U , J. C. POTTER, H. W. JOHNSON, J R . , A. E. O ' D O N N E L L , AND F. T. W E I S S .
Determination of Endrin in Agricultural Products and Animal Tissues.
Bureau of Mines
Crude Oil Analysis as a Tool for Geological Correlation. 30 A
Oxidation of
Using Azoxine Indicators. - 61. LEO LEVI. Location of Unsaturation in Terpenes and Terpenoids by Infrared and Chemical Anal ysis.
Wednesday Afternoon
2:15—
D . M. W E S T AND D. A. SKOOG.
SUTTON
Quantita
Derivatives
Methods and Geochemical Correlations of Por phyrin Research. 9:55— 4 1 .
New
Some Organic Compounds with Standard Solutions of Quinquevalent Vanadium.
SECTION A
9:30— 40.
R. W. SCHMID AND CHARLES N . R E I L L E Y .
Complexon for Titration of Calcium in the Pres ence of Magnesium. 2:50— 59.
Wednesday Morning
9:10— 39.
CHARLES N. REILLEY, Presiding 2:30— 58.
4:05— 8 1 .
T. G. BOWERY AND F . K. G U T H R I E .
Endrin
Residues
on Tobacco.
TDE
and
Isolation and
NEWS
4:20— 82.
Identification Smoke.
of T D K Residues in Cigarette
H. C. AUSTIN,
J R . , AND F . L. BONNER.
Deter
mination of Trace Quantities of Lindane in PoultryTissue. 4:35— 83.
E . L. STANLEY, I. ROSENTHAL, AND C. F . GORDON.
4:50—
Microdetermination of Rhothane ( T D E , D D D ) in Spray Residues. Discussion.
Thursday Afternoon SECTION Β GENERAL WARREN W. BRANDT, Presiding 2:00— 84.
ALLEN
A. D U S W A L T
AND W A R R E N
W.
BRANDT.
Determination of Fluoride Ion by Turbidimetrie Titration. 2:15—
85.
LEON
W.
WILLIAM
GAMBLE,
WALTER
H. JONES.
Rapid
E.
PRICE,
AND
Determination of
Fluoride in Silica-Alumina Catalyst by Steam Hydrolysis. 2:35— 86. K. A. KUBITZ. Determination of Traces of Isocyanate in Urethane Based Polymers. 2:50— 87.
Rinco Rotating Vacuum-Type Evaporator
3:05— 88.
evaporation
ity four
or five
of solvents times—varying
of low with
89.
solvents.
Adaptable for volumes of 1 ml to 500 ml. Utilizes the principle of the spreading out of a thin film over large area and subjecting to negative pressure. Can be used in single or multiple units. At 20°C, 30 ml of water will be evaporated in 30 minutes. Especially useful with biological extracts or heat-sensitive compounds; will operate faster with increased temperature, if sample permits. Consists of a mimel metal shaft with a f 19/38 joint at lower end. Shaft rotates on oilite bronze bearings; Teflon ring seals; monel metal hous ing. Use with standard pump and trap, or standard aspirator. Flasks rotate at 93 r.p.m. 39474—Rinco Rotating Vacuum-Type Evaporator, with ~ψ 19/38 joint to accommodate small flasks, such as 50 ml; with induction type motor; for 115 v., 60 cycles, A.C. $114.50
39475—Rinco Evaporator, with brush-type motor . . $96.50 80820D—Adapter, "Pyrex" Brand, for adapting f 19/38 joint of Rinco Evaporator to larger flasks, having a ~ψ 24/40 joint, each $1.83 New Rinco "Solvent Recovery Condenser" Valuable accessory to Rinco Evaporator. Connects to flask of Rinco Evaporator with standard taper ground glass joints. Rotates with evaporating flask. Recovers in excess of 75% of solvent. Increases speed of evaporation 2 to 3 times. Easy to cool with cold water or ice. Protects vacuum pump and system from corrosive solvents. 39477—Solvent Recovery Condenser, standard size, 1000 ml, with 500 ml working capacity, "f 24/40 ground glass joints, (Other sizes available on request) Each. . . . $ 1 6 . 0 0
ALOE SCIENTIFIC D I V I S I O N O F A. S. ALOE C O M P A N Y 5655 Kingsbury · St. Louis 1 2 , M o . LOS ANGELES · SAN FRANCISCO · PHOENIX · SEATTLE DENVER · MINNEAPOLIS · KANSAS CITY · DALLAS NEW ORLEANS · ATLANTA · WASHINGTON, D. C
34 A
•
J.
H.
KARCHMER
AND M A R J O R I E
T.
WALKER.
R. D . SCHWARTZ AND D . J. BRASSEAUX.
Deter
mination of Normal Paraffins in Olefin-Free Petroleum Distillates by Molecular Sieve Sorption and Refractometry.
volatil 3:40— 90.
each
Statis
Modification of t h e Acetic Acid-Zinc Reflux Method for Determining Disulfides in Petroleum Naphtha. 3:20
Speed
GEORGE A. H U F F AND F R E D H. T I N G E Y .
tically Designed Training and Testing Program for an Analytical Control Laboratory.
C. E U G E N E
BENNETT,
S. D A L NOGARE,
SAFRANSKI, AND O. D . L E W I S .
L.
W.
Trace Analysis
by Gas Chromatography. 4:00— 91.
GEORGE
KYRYACOS AND CECIL
E. BOORD.
Gas
Absorption Chromatography in t h e Analysis of Cool-Flame Combustion Products. 4:20— 92.
JOHN
L.
DOLPHIN
AND THOMAS
W.
STANLEY.
Vapor Phase Chromatography in Air Pollution Studies Column Evaluation. 4:40— 93.
NATHANIEL
BRENNER.
Modification
of a Gas
Chromatography Instrument for Special Laborator\- Problems.
Friday Morning SECTION A SYMPOSIUM ON METHODS FOR ANALYSIS OF PESTICIDE RESIDUES (Joint with Division of Agricultural Food Chemistry)
and
LOUIS LYKKEN, Presiding 9:00— 94. Louis LYKKEN. Introductory Remarks. 9:05— 95. G. R. BOYD. Determination of Residues of 0-2,4-Dichlorophenyl 0,0-Diethyl Phosphorothioate (V-C 13 Nemacide) by Cholinesterase Inhibition. 9:20— 96. L. E. PALMER AND E . F . WILLIAMS.
Analysis of
Thimet and I t s Metabolites. 9:35— 97.
C. H. V A N MIDDELEM AND R. E . W A I T E S .
Pesti
cide Residues. Enzymatic Determination of Systox in Collards, Lettuce, and Mustard by Use of Cholinesterase Inhibition Technique. 9:50- - 98. C. L. D U N N . Analytical Method for Determina tion of 2,3-jo-Dioxanedithiol S,S-Bi's(0,0-Diethyl Phosphoro-dithioate) (Hercules 528). 10:05— 99.
P . A. GIANG AND M. S. SCHECHTER.
10:20—100.
Method for Estimation of Guthion Present in Cottonseed Residues. R. P . GIGGER. Determination of Diazinon Residues.
Colorimetric
10:35—101.
W. E. WHITEHURST AND J. B . JOHNSON.
10:50—102.
mination of CRAG D C U Residues in Crops and Soil. J. R. LANE. Colorimetric Microdetermination of Spergon (2,3,5,6-Tetrachlorobenzoquinone) Resi dues on Food Crops.
Deter
Circle No. 34 A on Readers' Service Card, page 75 A ANALYTICAL CHEMISTRY For further information, circle number 35 A on Readers' service Card, page 75 A
NEWS
NEW...
11:05—108.
LIGHT SCATTERING MEASUREMENTS AT ELEVATED TEMPERATURES
R. J. LACOSTE AND G. T. M Y E R S .
Colorimetric
Determination of Dithiocarbamate Residues. 11:20—104.
11:35--10.5. 11:50
J. E . N E W E L L , R. J. MAZAIKA, AND W. J. COOK.
Miorodetermination of Phygon in Water. J. R. LANE. Colorimetric Miorodetermmation of Phygon (2,3-Dichloro-l,4-naphthaquinone) Res idues on Food Crops. Discussion SECTION Β GENERAL J O H N MITCHELL, JR.,
9:00—106.
Presiding
W. B . C H E S S AND D . N . BERNHART.
Determina
tion of Small Amounts of P3rrophosphate in Disodium Phosphate. 9:15—1.07.
E U G E N E SAWICKI AND R O B E R T M I L L E R .
Detec
tion of Pyrene and Benzo(a)-pyrene in the Atmos phere. 9:30—108.
W. H. POWER, W. C. MCCLUGGAGE, G. D . NELSON, AND J. H. PAYNE, J R . Separation of
Radium and Barium by Ion Exchange Elution. 9:45—109.—R. N E W accessories for the BRICE-PHOENIX L I G H T SCATTER I N G P H O T O M E T E R permit measurements t o be made on polyethylene and similar materials that are solid at room tem perature. INSTRUMENT •
MEASURES:
Write for complete
10:00—110.
3803-05 N. 5th St., Philadelphia 40, Pa., H.T. Dept.
10:40—112.
11:00—113.
arbor—$6.75. Stand and clamp not supplied.
HELLER MODEL 69 STIRRER is specifically designed for general laboratory stirring • applications where accurate speed regu lation is essential. The gearhead, series wound motor is controlled by a tapped autotransformer which gives better speed regulation without the energy loss in heat common to a rheostat. Motor develops 1/40 h.p. Torque: 1-2 inch pounds. Speeds: 100-1200 rpm in 11 discrete steps. Stirrer also serves as shaker drive for Van Slyke apparatus, separatory funnel extractions. Operates on 115 volts, 60 cycles, single phase.
36
F. Ο. Β. Las Vegas, Nevada
G E R A L D K. H E L L E R C O . Las V e g a s , N e v a d a
Circle No. 38 A-2 on Readers' Service Card, page 75 A •
ANALYTICAL CHEMISTRY
MORTON SCHMALL AND E . G. WOLLISH.
Deter
I. B . EISDORFER AND W. C. ELLENBOGEN.
Sepa
D E A N J.
VEAL,
FRANK C. HAAS, AND M.
D.
MAN. Spectrophotometric Determination of Total Carbonyl Content Utilizing Integrated Absorbance Measurements. R.
C.
BLINN
AND F .
A.
GUNTHER.
Simple
Friday Afternoon SYMPOSIUM ON METHODS FOR ANALYSIS OF PESTICIDE RESIDUES (Joint with Division of Agricultural and Food Chemistry) C. H. VAN MIDDELEM, Presiding 2:00—116.
C. H. VAN MIDDELEM.
2:05—117.
J . H. BRUMBAUGH AND D . E . STALLARD.
Introductory Remarks. Colori
metric Method for Perchloroethylene. Deter mination of Residual Perchloroethylene in Fumi gated Wheat. 2:20-118.
D . E . STALLARD AND J. H . BRUMBAUGH.
2:35—119.
of Residual Benzene in Wheat Following Fumiga tion. R. H. CARTER. Method for Determination of Ethylene Dibromide Residues in Fumigated Materials.
2:50—120.
CALVIN
MENZIE.
Determination
Study
of
w-Dinitro-
B. D . HILTON AND M. H. J. W E I D E N .
Modifica
phenol. tion of the Analysis for Ovex on Apples. 3:20—122.
J. R. L A N E , D . K. GULLSTROM, AND J. E . N E W E L L .
Determination of Duraset (Λ'-Metatolyl Phthalamic Acid) Residues in Fruit Crops. 3:35—123.
R. B. BRUCE, J. W. HOWARD, AND J. B. ZINK.
Determination Apples. 3:50—124.
of Diphenylamine
Residues on
F . A. GUNTHER, R. C. BLINN, M. J. KOLBEZEN, C. W. WILSON, AND R. A. CONKIN. Ammonia.
Spectrophotometric Techniques and Equipment for Evaluating Concentrations of Spectrally Absorbing Vapors in Dynamic Systems.
Order from your laboratory supply dealer, or write —
38 A
J. E. FAGEL, J R . , P . D . Zemany AND H. A. L I E B -
11:20—114.—L. S. HARROW, J. T. BUTLER, F . E . R E S N I K , A N N E E S T E S , MARGARET BILL, AND R. B. SELIG-
3:05—121. Model 69. Complete with attachments
1 8 1 9 Industrial Road
Ultraviolet
Determination of Ammonia with Cupric Carbon ate.
Laboratory Stirrer
propeller, shaft, motor bracket. Vt" chuck and
JOSEPH.
GRIMES. New Colorimetric Method for Deter mination of Traces of Methanol in Ethylene.
11:40—115.
HELLER
Included: stainless steel
T.
ration and Determination of Triiodothyronine, Thyroxine, and Some Related Amino Acids Using Circular Paper Chromatography.
Circle No. 38 A-1 on Readers' Service Card, page 79 A
High torque! Gear head!
AND P .
mination of Panthenol and Pantothenates in Multivitamin Preparations.
information
PHOENIX PRECISION INSTRUMENT CO.
HAHN
HAFSKY. Tungsten or Molybdenum by X-Ray Emission Spectrography. 10:20—111.
A b s o l u t e Turbidity • Dissymmetry * Depolarization • Molecular Weight
B.
Spectrophotometric Determination of Zirconium Using Bromanilic Acid.
4:05—125.
H. C. AUSTIN, J R . , F . L. BONNER, AND E . A.
4:20
EPPS, J R . Spectrophotometric Determination of Arsenicale on Plant Material. Discussion.
