PIERCE CHEMICAL COMPANY

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NEW CHEMICALS

Cary, continued.

Liquid Scintillation Solutions

c - 1 No spectrophotometer, i n c l u d i n g ours, is • I l complete without good absorption cells. So we offer a complete line of r e c t a n g u l a r a n d cylindrical cells. Oojay.. Like others, o u r cells cover the entire ultraviolet, visible a n d near-infrared ^ ^ ^ ^ ^ ^ ^ ^ ^ Λ r a n g e . Unlike the others, we use only two types of -Gmmàéï Mm, glass. Suprasil I I p r o v i d e s o p t i m u m transmission in the visible a n d UV, while Infrasil outdoes itself in the near-infrared. As a result, you n e e d fewer cells. You save money and d o better work, regardless of whose s p e c t r o p h o t o m e t e r y o u ' r e using. For literature a n d a price list, write Cary I n s t r u m e n t s , a Varian subsidiary, 2724 South Peck Road, M o n r o v i a , California 91016. Ask for data file A008-60. cary

Six premixed, ready-to-use solutions for liquid scintillation analyses are available. They are : Ready-Solv I, a mixture of 1 / 3 Triton-X-100 and 2 / 3 scintillation toluene, without fluors, for emulsifying polar solutions, S8.S7/gal II, a mixture of Bio Solv-2 and scin­ tillation toluene, without fluors, of which 10 ml will neutralize and solubilize 1 ml of alkaline tissue digest pre­ pared with 2N NaOH, S30/gal I I I , a mixture of Bio Solv-3 and scintillation toluene, without fluors, for aqueous salt, plasma, serum, and urine sample counting, will solubilize 1 ml of neutral aqueous sample, $30/gal IV, butyl PBD and PBBO, without solubilizer, in scintillation toluene, S29/gal V, PPO and POPOP, without solu­ bilizer, in scintillation toluene, $27/gal VI, BBS-3 and toluene with butyl PBD and PBBO added, $45/gal. Beckman Instruments, Inc., 2500 Harbor Blvd., Fullerton, Calif. 92634. 714871-4848 501

instruments

Circle No. 156 on Readers' Service Card

A TYPICAL

High-Purity Research Chemicals Complete sets of the most popular analytical samples, called libraries, packaged in conveniently labeled styrofoam display trays are now available. They are designed for the analytical chemist for his use in GLC, ir, uv, nmr, and mass spectrometry. The sets (1 ml for liquids and 1 g for solids) are drawn from a total analytical list­ ing of 800 hydrocarbons, 150 ketones, and 370 alcohols. Liquids are sealed under nitrogen in snap-top ampoules; solids are in screw-top vials. Hydro­ carbons are offered in 1 ml or 1 g units; alcohols and ketones in 2 ml or 2 g units. Actual mole % purity is on each ampoule. Twenty-one actual sets are available with 10 to 37 units each. The company's C-3 catalog gives details of these sets. Chemical Samples Co., 4692 Kenny Rd., Columbus, Ohio 43221. 614-451-3322 502

VA

total time 6 minutes FROM

R A W S A M P L E TO GAS C H R O M A T O G R A P H Y

Silylation makes possible the gas chromatographic analysis of thousands of compounds n o t formerly amenable t o GC and eases the problems of the GC analysis of many other polar substances. Most silylation techniques are rapid and easy, transforming many intractable substances into volatile and thermally stable trimethylsilyl ethers that give symmetrical GC peaks. We have just published a 60 page " H a n d b o o k of S i l y l a t i o n " that is a gold mine of information on silylation and other special techniques of gas phase analysis. It contains a wealth of practical suggestions, methods, references, data on reagents and accessories. " H a n d b o o k of S i l y l a t i o n " is yours for the asking; drop us a note—today.

Add

1 ml TRI-SIL.

Pc

PIERCE CHEMICAL COMPANY P.O. Box 117 Rockford, Illinois 61105 U.S.A. HON£ 815/968-0747 TWX 910-631-3419

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Spectrophotometer Test Set A spectrophotometry function test set provides precisely standardized so­ lutions with concentrations relative to each other of 1.00, 0.75, 0.50, 0.25 at 670 nm, 520 nm, and 420 nm. The set also includes a blank solution and is packaged in a convenient bench-top box. The individual tubes are silk-

••-•&a£jr:-:?

Shake

t o dissolve.

A l l o w t o stand 5 minutes; w i t h d r a w sample f o r injection.

Inject sample into chromatograph.

Circle No. 117 on Readers' Service Card

ANALYTICAL CHEMISTRY, VOL. 42, NO. 7, JUNE 1970 ·

107 A