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INDUSTRIAL and ENGINEERING CHEMISTRY Vol INDUSTRIAL a n d ENGINEERING CHEMISTRY ANALYTICAL EDITION WALTER J. MURPHY, EDITOR ISSUED JUNE 17, 1943 VOL. 15, NO. 6 CONSECUTIVE NO. 12 Editorial Assistant: G. Gladys Gordon Manuscript Assistant: Stella Anderson Make-up Assistant: C harlotte C. Sayre Advisory Board B. L. C l a r k e G. E. F. L u n d e l l R. H. M ü l l e r T . R. C u n n i n g h a m M . G. M e l l o n H. H. W i l l a r d Determination of Precision of Analytical Control Determination of Iron in Presence of Chromium M e t h o d s ........................................... Raymond F. Moran 361 and Titanium with Jones Reductor .......................... F. S. Grimaldi, R. E. Stevens, and M. K. Carron 387 Turbidimetric Determination of Small Amounts of C h lo rid es . E. N. Luce, E. C. Denice, and F. E. Akerlund 365 Extraction of Ascorbic Acid from Plant M aterials . J. D. Ponting 389 Color Index. Light-Colored Petroleum Products . I. M. Diller, J. C. Dean, R. J. DeGray, and J. W. Wilson, Jr. 367 Apparatus for Purification of Hydrocarbons by Re­ crystallization ...................................... John Lake Keays 391 Determination of Iodine in Tetraiodophenol- Filtration Cylinder . R. J. DeGray and E. P. Rittershausen 392 p h th a le in .................................................................................. Samuel Weiner, Byron E. Leach, and Mary Jane Bratz 373 MICROCHEMISTRY: Determination of Monoalkyl Ethers of Ethylene Semimicroanalysis of Saline Soil Solutions .... Glycol . Harold W. Werner and James L. Mitchell 375 R. F. Reitemeier 393 Collection and Estimation of Traces of Formalde­ Estimation of Sulfonamides........................................... hyde in Air . F. H. Goldman and Herman Yagoda 377 S. W. Lee, N. B. Hannay, and W. C. Hand 403 Microdetermination of Mercury in Organic Com­ Furfural (Correspondence) . Vanderveer Voorhees 378 p o u n d s ............................................... H. William Eckert 406 Determination of Small Amounts of Tellurium in Microdetermination of Arsenic in Biological M a­ H ig h -L ead a n d T in -B ase A llo y s ............................... te ria l ...........................................James A. Sultzaberger 408 Ralph A. Schaefer 379 Mustard Gas in A ir ..........................William Rieman III 411 Mixed Solvent Extraction James H. Wiegand 380 Microdetermination of Magnesium with Polaro- Determination of Halogens in Organic Compounds g r a p h .......................................Christopher C arruthers 412 Robert R. Umhoefer 383 Reproducibility of Weighings Made on Micro­ Determination of Chloride in Bauxite-Supported chemical Balances (A. C. S. Committee Report) Anhydrous Aluminum Chloride Catalysts .... Clement J. Rodden et al. 415 W. A. La Lande, Jr., Heinz Heinemann, and W. S. W. McCarter 385 Detection of Gold in Plating .... Melvin Lerner 416 The American Chemical Society assumes no responsibility for the statements and opinions advanced by contributors to its publications. 29,500 copies of this issue printed. Copyright 1943 by American Chemical Society. Publication Office: Easton, Pcnna. Editorial Oilicc: 1155 16th Street, N. W., W ashington, D. C. Advcrti«ing Departm ent: 332 West 42nd Street, New York, N. Y. Telephone: Republic 5301. Cable: Jicchcm (Washington) Telephone: Bryant 9-W30 Published by the American Chemical Society, Publication Office, 20th & copies: Industrial Edition, $0.75; Analytical Edition, $0.50. Special rates Northampton Sts., Easton, Penna. Entered as second-class matter at the to members. Post Office at Easton, Penna., under the Act of March 3, 1879, as 24 times a No claims can be allowed for copies of journals lost in the mails unless year. Industrial Edition monthly on the 1st; Analytical Edition monthly such claims are received within 60 days of the date of issue, and no claims on the 15th. Acceptance for mailing at special rate of postage provided for will be allowed for issues lost as a result of insufficient notice of change of in Section 1103, Act of October 3, 1917, authorized July 13, 1918. address. (Ten days’ advance notice required.) “Missing from files” Annual subscription rate, Industrial Edition and Analytical Edition sold cannot be accepted as the reason for honoring a claim. Address claims to only as a unit, members S3.00, others $4.00. Foreign postage to countries Charles L. Parsons, Business Manager, 1155 16th Street, N. W., Washington. not in the Pan American Union, 82.25; Canadian postage, S0.75. Single D. C., U. S. A. 4 INDUSTRIAL AND ENGINEERING CHEMISTRY Vol. 15, No. 6 TYPE B-2 VVTE enthusiastically introduce a new "Photelometer,” not ” to supplant but to be a companion instrument to No. 12335 Cenco-Sheard-Sanford "Photelometer.” The new type is smaller in size and is known as Industrial Type B-2. It is designed to take economic advantage of production in quantity and utmost simplicity of construction without sacrifice of desirable features. Its sensitivity and accuracy are sufficient for most laboratory determinations. Type B-2 is a compact filter photometer for chemical analyses in the routine or control laboratory. Molybdenum, titanium, vanadium, or manganese in steel; lead, copper, iron, or vita­ mins in foods are a few typical determinations to which this type lends itself. It is a barrier-layer instrument consisting of basically a low The basic parts are mounted in an attractive plastic case for voltage light source, an adjustable light aperture, a three-color convenient manipulation and reading. A constant voltage filter holder, receptacles for tubular or rectangular absorption cells, a single photoelectric cell, and a sensitive current transformer to supply constant intensity of light when operated measuring instrument with a 2}/¡“ scale. The scale reads from on a controlled frequency power line is furnished with the 0-100 in 50 divisions. 115 volt AC instruments. No. 12346 "Photelometer” Industrial Type B-2 including a package of (12) No. 12344G Tubular Absorption Cells. N o .........: ................................................................................................ A C For v o lts................................................................................................ 115 AC 6 DC P ric e ....................................................................................................... $ 1 1 0.00 $100.00 CENTRAL SCIENTIFIC COMPANY SCIENTIFIC INSTRUMENTS ( j N ( Q LABORATORY APPARATUS Rtc u * pat off. NEW YORK TORONTO CHICAGO BOSTON SAN FRANCISCO June 15, 1943 ANALYTICAL EDITION PIKIIIIICTIIIII LINIiSi America over, the accent is on ever-increasing pro­ Baker & Adamson Reagents are the standard for duction! From sprawling, busy assembly lines in laboratory control. Laboratories know they can shipyards . .. plants ... factories, war material is rely upon the highly uniform quality of B&A moving off production lines in surging volume ... Reagents... count on their dependability and pur­ America is “delivering tlie goods!” Yet with all the ity ... because accuracy, high quality and uni­ pressing need for more and more war materials— formity are “built” into each B &A Reagent through quality still remains the important factor. 60 years of experience. Dependable reagents are vital ... becausc Whether your laboratory requires reagents they help maintain this quality and accuracy ! for special analyses or for routine testing . In many leading plants the country over, select B& A Reagents to do the job right! SETTING THE PACE IN CHEMICAL PURITY SINCE 1882 SOUU-i.iv/~ - - rmdini! 1 Baker Adamson CÁ&wttca/sAND plating in plating wide aPP “ hearings, stor- alrplanc molor ctc. Sigiufi- Division of GENERAL CHEMICAL COMPANY, 40 Rector St., New York C ."R A id e/s oge battery d lahor Technical Service Offices: Atlanta • Baltimore • Boston • Bridgeport (Conn.) • Buffalo • Charlotte (N. C.) Chicago • Cleveland • Denver • Detroit • Houston • Kansas City • Milwaukee • Minneapolis result from its «- New York • Philadelphia • Pittsburgh • Providence (R. I.) • St. Louis • Utica (N. Y.) Pacific Coast Technical Service Offices: San Francisco • Los Angeles today '• Pacific Northwest Technical Service Offices: Wenatchee (Wash.) • Yakima (Wash.) In Canada: The Nichols Chemical Company. Limited • Montreal • Toronto • Vancouver INDUSTRIAL AND ENGINEERING CHEMISTRY Vol. 15, No. 6 AQUEOUS PROCESSING SOLUTION HEATING STEAM AND CONDENSATE TO BOILER AQUEOUS PROCESSING SOLUTION WANT TO IMMOBILIZE THIS LEAK? To keep contaminated condensate ure, continuously, the electrolytic from sneaking into a boiler’s tubes conductivity of the water, and open and sabotaging steam production, a dump valve in the line when a leak we can supply an instrument which is indicated by a rise in conductivity. will halt the potential damage at its The instrument employed may be source, and hold it immobilized while either of the following: a maintenance pipe-fitter repairs the leak and thus ends the contamina­ If the operation of a signal light tion. and the opening of the dump valve are all you require when a pipe The method employed is to meas- springs a leak, we recommend No. 4S50 Signalling Conductivity Con­ troller. This instrument has no moving parts except a relay; re­ quires practically no maintenance; gives protection at minimum cost. If you want a continuous, auto­ Micromax Controlling Recorder used by the matic record of the purity of the Cros*ett (Ark.) Lumber Co., on a water line. condensate, in addition to an auto­ tion than does a temperature re­ matic signal and the operation of a corder. dump valve, we recommend No. 33111 Micromax Signalling
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