LABORATORY SERVICE CENTER EASTERN CHEMICAL

used within 12 months from date of first insertion. Per inch: 1" — $85;. 12" — $84; 24" — $81; 36" — $78; 48" — $77. CALL OR WRITE BARBARA A...
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LABORATORY

SERVICE CENTER environmental & material analysis

m-Aminophenol · Ammonium Purpurate · Bis-(2-Hydroxyethyl)glycine & Na Salt Bromoacetaldehyde Diethylacetal · 1-Bromonaphthalene · Cellobiose Q-Chloralose · Chioranil · Dimethyiacetamide · 3,3-Dimethylglutaric Acid Dipicolinic Acid · Dithizone · Escuiin · 2-Hydroxy-1,4-naphthoquinone Hydroxylamine HCI & Sulfate · Imidazole · Isatin · Malonic Acid Maltose · Methyl Acetate · Methylamine Hydrochloride · Neutral Red N-Phenylglycine · Pimelic Acid · Pyruvic Acid · Sodium-3-Hydroxybutyrate Sodium Malonate · Sodium Pyruvate · Sodium Tetraphenylboron · Xylose

• water, waste water, sewage • • Precious metal/fire assay • • Spectrograph^ analysis •

industrial nygiene Microbiology • GC MS, IK Metals, ores, chemicals Princeton Svc. Ctr. U.S. Hwy 1, Box 3108 Princeton, N.J, 08540

princeton testing laboratory

(609) 452-9050

Write for our Products List of over 3000 chemicals TWX: 510-227-6230

Tel: 516-273-0900

EASTERN CHEMICAL

P.O. Box 2500

D i v i s i o n of G U A R D I A N C H E M I C A L C O R P .

SMITHTOWN, Ν. Υ. 11787

DEPT. AC

Laboratory Service Center (Equipment, Materials, Services, Instruments for Leasing), Maximum space — 4 inches per advertisement. Column width, 2 - 3 / 1 6 " ; two-column width, 4 - 9 / 1 6 " . Artwork accepted. No combination of directory rates with ROP advertising. Rates based on number of inches used within 12 months from date of first insertion. Per inch: 1 " — $85; 1 2 " — $84; 2 4 " — $ 8 1 ; 3 6 " — $78; 4 8 " — $77. CALL OR WRITE BARBARA

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AUFDERHEIDE

ANALYTICAL CHEMISTRY 25 Sylvan Road South Westport, Ct. 0 6 8 8 1 203-226-7131

CIRCLE INQUIRY NO. XX 3 29-31 6 5

INDEX TO ADVERTISERS IN THIS ISSUE ADVERTISERS PAGE NO. Agriculture Canada 834A ·Alltech Associates, Inc 836A Chromad Agency Analytical Biochemistry Labs 822A Bird-on-the-Wire 'Analytical Instrument Development, Inc. . . . . 838A Mercer Associates 'Applied Research Laboratories 837A J.B. Talmadge & Company, Inc.

INQUIRY NO. 38 34 XX 53 50

16

* J.T. Baker Chemical Co

832A

49

21

The Stiegler Agency Bausch & Lomb/ASD Blair Advertising, Inc.

851A

51

22, 25

'Beckman SID

830A, 881A

XX

18 26 17

19 23, 24 15 27 36

Ayer, Jorgensen, MacDonald 'Benson Company 'Bioanalytlcal Systems, Inc Kissinger Advertising Associates 'Blo-Rad Laboratories—Chemical Division . . Fred Schott & Associates

"Biotronik, Frankfurt Science Promotion 'Sybron/Brlnkmann Hanson, Fassler & Associates, Blatt Health Care Division 'Bruker Instruments, Inc. Techmarketing, Inc. 'Burdlck & Jackson Lab., Inc Studio 5 Advertising, Inc. Carlo Erba Strumentazione Publicitas

856A 844A 855A

880L OBC

63 66 67 65 246 245

858A

243 244

838A 247-248

869A 100

32

ChemServlce, Inc

848A

33

Bremble & Sewforth 'Chromatlx David R. McClurg

781A

37

Chrompack

849A

35

Reclamestudio Thart 'Continental Water Systems Corp Marketing Department Inc.

828A

902 A · ANALYTICAL CHEMISTRY, VOL. 53, NO. 7, JUNE 1981

98 97 96

ADVERTISERS Corco Chemical Corporation SIT/COM 'Crawford Fitting Falls Advertising Co. Digital Equipment Benton & Bowles, Inc. 'Dlonex Commart Communications 'Dohrmann—Division of Envlrotech Fred Schott & Associates "DuPontCo.—Liquid Chromatographs - . N.W. Ayer ABH International Dynatech Precision Sampling Corp Diane Allen & Associates 'Eastman Kodak Company Rumrill-Hoyt, Inc. Ε G & G Ortec Charles Tombras Advertising, Inc. Ε G & G Princeton Applied Research The Message Center, Inc. Eldex Laboratories, Inc Eli Media Elsevier Scientific Publishing Co " F a r m i t a l i a Carlo Erba Publicitas 'Finnigan Corporation F & M Advertising «Fisher Scientific Co "Foxboro Analytical STG Marketing Communications, Inc. "Gilson Medical Electronics Fred Schott & Associates Hach Company Art Service/Technical Promotions Hamamatsu Corporation Mandabach & Simms, Inc. "Hamilton Company Mealer & Emerson Advertising ' H e l l m a International Miller Advertising Agency, Inc.

PAGE NO. 862A 835A 877A 860A 773A 792A-793A 880A 841A 874A 833A 872A 861A 880D 888A 798A-799A 846A 796A 866A 848A 776A-777A 648A