NEW CHEMICALS Steel S p e c t r o g r a p h s
Standards
A new series of seven spectrographic standards with analysis provided by four independent laboratories is now available. The series contains five low alloy and two plain carbon steel stan dards. Data is furnished on C, Mn, P, S, Si, Cu, Ni, Cr, Mo, Sn, and Al. A three-page bulletin describing the standards is also available. Brammer S+andard Co., P. 0 . Box 339, Aliquippa, Pa. 15001 501 New
DON'T TAKE OUR WORD FOR IT...WE DON'T! That's why we asked experts in the amino acid analysis field to prove to us that our reagent grade Ninhydrin is the best there is. Oh, sure, we run all the routine tests for sensitivity, blank, UV, ash and solubility. Plus a few clever checks that are privy to our staff. But we figure it's important enough that YOU know that Pierce Ninhydrin is proven in use. Therefore every lot of our Ninhydrin is proven in actual use by a most capable and respected independent laboratory*. So now we know- and you know- that Pierce Ninhydrin is all that you expect it 1o be. Since we pioneered Ninhydrin 18 years ago we have striven to stay ahead of the fastmoving technology of amino acid analysis. A n d we'd like you to know that effort is still in progress. A n d , of course, we supply the broadest line of other speciafty amino acid and peptide reagents. Dansyl chloride and its amino acid derivatives, dinitrofluorobenzene, t-butyl azidoformate, fluorescein mercuric acetate, hexafluoroacetone and hexafluoroisopropano! (spectral grades), silylating reagents and standards — to select a random few f r o m our extensive list. We'd like to send you our list of amino acid and peptide reagents. Just ask for " A m A c list."
Solubilizers
New solubilizers for liquid scintilla tion cocktails eliminate the need to use dioxane as a cocktail solvent for aque ous biological material permitting toluene to be substituted. Bio-Solv cocktails are phase stable at both re frigerated and ambient temperatures. All phosphorescence and chemiluminescence problems are eliminated. Count ing efficiency is very high. Formerly manufactured under the name Colosolve, the three Bio-Solve formulations are now available from Beckman In struments, Inc., 2500 Harbor Blvd., Fullerton, Calif. 92634 502
* O u r Severest Critics. These accomplished gentlemen head ArRo laboratories in Joliet, Illinois. They are respected for their advanced knowledge of amino acid analysis and other techniques. They supervise the operation o ' the sophisticated instru mentation that must prove every lot of Pierce Nin hydrin and Amino A c i d s Standards Solution before :ept if
PIERCE CHEMICAL COMPANY P H O N E 81S-WS-0747
S t a n d a r d Solutions f o r Volumetric Analysis
A complete line of Fixanal standard solutions for volumetric analysis, chem ically pure reagents in precise and accurate weight quantities, are avail able. They are supplied in ampoules containing the exact equivalent of reagent specified on the container to be dissolved in water to the desired normality. Pfaltz and Bauer, Inc., 12(3-04 Northern Blvd., Flushing, Ν. Υ. 11368 504
T W X 910-631-M19
Circle No. 168 απ Readers' Service Card
WATER WON'T FLOW UPHILL YET
Cationic Methacrylate Monomer
Sipomer Q-l, a cationic methacrylate monomer, may be homopolymerized to a hygroscopic polymer which can be used m preparing adhesives, coatings, coagulants, and antistatic additives. I t may also be copolymcrized with other monomers to impart a cationic char acter and improve stability. Alcolac Chemical Corp., Chemical Development Dept., 3440 Fairfield Rd., Baltimore, Md. 21226 503
P.O. Box 117 fiockford. Illinois 6U05
Mr. Gerald A r m s t r o n g
but we have reversed the normal mechanism of osmosis. A recent article in ENVIRONMENTAL SCIENCE & TECHNOLOGY described an interesting twist on clas sical osmosis . . . and its practical application in puri fying water. Other articles have described the growing market for water treatment chemicals . . . role of chemists, chem ical engineers in water resources management . . . federal air quality standards.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY American Chemical Society 1155 16th Street, N.W./Washington D.C. 20036 VOL. 4 0 , NO. 6, MAY 1968 ·
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