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2,2'-Dipyridyl · Disodium Phenylphosphate · Ethyl & Methylamine HCI Fructose · 2-Hydroxycinnamic Acid · Hydroxylamine HCI & Sulfate

lndole-3-Acetic Acid · lodobenzene · Malonamide · 5-Methyl Furfural Nadic Anhydride · a-Naphtholphthalein · α-Naphthyl Red · Ninhydrin PAN · PAR · Propyl Caproate · Phenolphthalein · Sodium Succinate

Succinimide · Tetrahydrofurfuryl Acetate · Triphenylphosphine Write for our Products Lis' of over

Tel: 516-273-0900 · TOLL FREE; 800-645-5566

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Laboratory Service Center (Equipment, Materials, Services, Instruments for Leasing), Maximum space — 4 inches per advertisement. Column width, 2-3/16"; two column width, 4-9/16". Artwork accepted. No combi­nation of directory rates with ROP advertising. Rates based on number of inches used within 12 months from first date of first insertion. Per inch: 1 " — $135; 12" — $133; 24" — $130; 36" — $125; 48" — $122.

CALL OR WRITE JANE GATENBY

ANALYTICAL CHEMISTRY 25 Sylvan Road South

P.O. Box 231 Westport, CT 06881

203-226-7131

Polymeric GPC/HPLC Columns

• GPC & HPLC Resin Columns • Solvent of Your Choice • HPLC Column Heaters • Column Repacking

26 Pearl Street. Bellingham. MA 02019 (617 ) 9 6 6 - 1 3 0 1

INDEX TO ADVERTISERS IN THIS ISSUE

9 4 4 A · ANALYTICAL CHEMISTRY, VOL. 5 8 , NO. 8, JULY 1986

DELSEN Testing Laboratories, Inc.

• Thermal Analysis · HPLC GPC • Electrical & · Flammability

Mechanical · Many other Properties capabilities

7024 Grand Central Ave. Glendale, CA 91201 (213)245-8517 (818) 247-4106

CIRCLE INQUIRY NO. ADVERTISERS PAGE NO.

3 *Alltech Associates 827A Chromad

1 'American Scientific Products 917A S. R. Knapp Associates, Inc.

2 "Atago Bussan Company, Ltd 866A Echo Japan Corporation

21 J. T. Baker Chemical Company 839A

Stiegler, Wells & Brunswick, Inc.

20 'Bomen, Inc 8 7 9 *

13-18 'Bruker Instruments 832A-833A

Techmarketing, Inc.

32 Continental Water Systems 859A Palmer Milter Advertising

40 -41 Dohrmann Division/Xertex Corporation 884A Lena Chow Advertising

45 EGiiG/Ortec , F C

47 Extrel 855A Communications Ink, Inc.

CIRCLE INQUIRY NO. ADVERTISERS PAGE NO.

5 8 - 6 1 'Finnigan MAT Corporation 875A, 877A

Lena Chow Advertising

63-64 -Gilson Medical Electronics 829A

65 "Gi lson Medical Electronics 829A

97 Haake Buchler Instruments 845A

Techmarketing, Inc.

96 'Hellma Cells, Inc 925A Dansco Advertising

95 " W . C. Heraeus GmbH 906B-906C Amann Werbung

98-99 'Hewlett-Packard Company 847A Pinné, Garvin, Herbers & Hock

107 ' IBM Instruments, Inc 861A Marquardt & Roche, Inc.

105 ' Isco, Inc 843A Farneaux Associates

114 Janus Laboratories, Inc 878A Sky Corporation