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 38 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 —
1 8 1 9 Industrial Road
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
$
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.
