NEWS Chromatographic Detection of Mixed Halide Ions in 10~ 10 -Gram Particles.
Ν . Η. FARLOW.
Particles.
Ν . Η. FARLOW.
an economical
micro- m icroam meter
Quantitative Analysis of Chloride Ion in 10 ~6- t o 10~ 12 -Gram
with fast response and high stability
Wednesday Morning
SYMPOSIUM O N ANALYSIS OF FINE CHEMICALS A N D PHARMACEUTICALS W. W. HILTY, Presiding Introductory Remarks. W. W. HILTY. Color Reactions of Steroids with Sulfuric Acid-Methanol Reagent. Determination of Prednisolone. C. R. SZALKOWSKI.
New Colorimetric Assay Method for Cortisone, Hydrocortisone and Related Steroids.
E . P . SCHULZ AND J. D . N E U S S .
Determination of Phenyl Groups Attached t o Carbon.
WIL
LIAM A. STRUCK, JAMES L. JOHNSON, J A M E S E . STAFFORD, AND ELEANOR J . SCOTT.
IF YOU measure, record, or control low currents, this new instrument is for you. Though modestly priced, the Keithley 410 Micro-microammeter is well suited to almost all low-current measure ments, including currents in photocells, vacuum tube grids, semi-conductors, and ion chambers. Other applications include such diverse functions as area monitoring and liquid level control, when used with the proper transducers.
Titration of Certain Alkaloids in Glacial Acetic Acid, Using Malachite Green as t h e Indicator. KARL H . ROBERTS, ORLAND W. KOLLINO, AND SAMUEL M . T U T H I L L .
Determination
of Salicylic
Acid
in Aspirin.
CLIFTON W.
STRODE, J R . , F . N . STEWART, H . O. SCHOTT, AND J. Ε . CALD WELL.
Chromatography
of Organic Acidic Compounds
on Multi-
buffered Paper. MORTON SCHMALL, E . G. WOLLISH, COLARUSSO, C. W. K E L L E R , AND E . G. E . SCHAFER.
Control of Pharmaceuticals and Fine Chemicals.
REMO
W. B. F O R -
Wednesday Afternoon
KEITHLEY Model 410 micro-microatnmeter
SYMPOSIUM ON AIR POLLUTION (continued) SOLOMON LOVE, Presiding Introductory Remarks.
SOLOMON LOVE.
Role of the Analytical Chemist in Civil Defense. F. B. STEWART. Analytical Methods for Estimation of t h e Nerve Gases. J. E P S T E I N AND A. K O B L I N .
Field Sampling and Analysis of Nerve Gases.
A. KOBLIN" AND
J. E P S T E I N .
Alarms and Analyzers for Nerve Gas Vapors.
G. M. FOLEY, R.
D . E A N E S , HABOLD R. SMITH, AND R. H . CHERRY.
Chemical System for Nerve Gas Alarms and Analyzers.
G. 0 .
BADGETT, R. D . E A N E S , AND R. H . C H E R R Y .
Portable, Automatic Alarm for Detection of Toxic Agents in the Atmosphere.
Qualitative Agents.
J. C. YOUNG, J. R. PARSONS, AND H . R E E B E R .
Microanalysis
of Phosphorus-Containing
Toxic
C. M. W E L C H AND P . W. W E S T .
Amine-Pcroxide Reaction in t h e Detection and Quantitative Estimation of Nerve Gases. D . N . KRAMEH, B. W. FROMM, AND T. P . GOLDSTEIN.
Detection of Nerve Gases by Chemiluminescence.
J. GOLDEN-
SON.
Fluorometric Method for Estimation of Cyanide. Application to Analysis of Tabun Vapor. J . S. HANKER, R. M. GAMSON, AND H . K L A P P E R .
Wednesday Afternoon
SYMPOSIUM ON ANALYSIS OF FINE CHEMICALS AND PHARMACEUTICALS (continued) W . W . HILTY, Presiding Voltammetry Sulfa Drugs.
Assay
of
a t Solid Electrodes.
Anodic Polarography of
J O H N D . VOOBHIES AND R A L P H N . ADAMS.
Menadione.
Polarographic
Procedure.
JAN
C.
JONGKIND, EDMUND BUZZA, AND SEBECK H . F O X .
Comparative Study of Trace Potassium Estimation in Reagent Chemicals by Tetraphenylboron and Cobaltinitrite Methods. W. K . KINGSLEY, G. E . W O L F , AND W. WOLFBAM.
Fluorometric Analysis of 11-Desmethoxyreserpine (Harmonyl). JAMES A. GOBDON AND DONALD J. CAMPBELL.
Quantitative Paper Chromatography.
H . J . PAZDEBA, W. H .
M C M U L L E N , L. L. CIACCIO, S. R. M I S S A N , AND T . C. G E E N FELL.
V O L U M E 2 8, N O . 9, S E P T E M B E R 1 9 5 6
The 4 1 0 measures currents over 10 decades on 20 ranges—from 1 χ 10"3 to 3 χ 10"13 ampere full scale, accurate within ± 3 % . It drives the inexpensive 1-ma and 5-ma recorders, as well as the 50-mv rebalancing types, and is available in either rack panel or cabinet mounting. Input and output connectors are furnished at both front and back. After α five-minute warm-up, zero drift is less than 2 % of full scale in eight hours, with less than 2% in any subsequent 24-hour period. Typical time constants are 0.10 and 2.0 seconds on the 10 10 and 10"12 ranges with 1000 mmf across the input, thus permitting lengthy cabling to remote ion chambers. Other features include a very low input voltage drop of 5 mv; a 250-volt tap at the back; for polarizing ion chambers; and input noise below 1 % full scale on all ranges. Modifications available include incorporation of a contact meter or sensitive relay for control work. A new folder on this latest vacuum tube micro-microammeter is now ready with complete descriptive data. A note on your company letterhead will bring a copy by return mail.
1
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KEITHLEY INSTRUMENTS, INC. 12415 Euclid
Avenue
Cleveland
6, Ohio
I Circle No. 25 A on Readers' Service Card, page 71 A
25 A
