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storage tanks. Foxboro. 419. Spectrometer ... spectrometers; and data systems. U.S.. Analytical Instruments ... 1135D SAN ANTONIO ROAD. PALO ALTO, CAL...
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AutoSystem gas chromatograph in­ cludes a built-in 82-position autosampler. Parameters for two separate automation modes, as well as the sys­ tem's three speeds of injection and five GC methods, can be programmed through the keyboard. Perkin-Elmer

401 Environmental analysis. Brochure discusses Century OVA portable or­ ganic vapor analyzers. Applications in­ clude soil gas monitoring, natural gas

leak detection, arson investigation, and monitoring of leaking underground storage tanks. Foxboro 419

tainers, centrifuge tubes, reference so­ lutions, pipets, and syringe dispensers. 33 pp. Oxford Labware 430

Spectrometer. Brochure highlights the JY 50E spark emission spectrome­ ter, which is capable of determining up to 47 elements in < 1 min. Principles of operation, specifications, and applica­ tions are discussed. Instruments SA 421

Instrumentation. Catalog features analytical instruments for rental, leas­ ing, and direct purchase. Included are gas, liquid, and ion chromatographs; FT-IR, UV-vis, fluorescence, and AA spectrometers; and data systems. U.S. Analytical Instruments 426

MS. Brochure describes applications of inorganic MS in the analysis of semi­ conductor materials and processes. In­ cluded is information on gas analysis by APIMS and depth profiling and im­ aging with magnetic-sector SIMS. VG Instruments 423

FT-IR. Catalog features sampling ac­ cessories and supplies for FT-IR spec­ troscopy. Products for liquid, solid, gas, and high-temperature sampling are included. 46 pp. Spectra-Tech 427

Catalogs LC. Catalog features HPLC columns and packings, including chiral, afunc­ tional, and base-deactivated phases as well as microbore and SFC columns. ES Industries 425 Clinical analysis. Catalog includes glucose tolerance test beverages, cups for automatic analyzers, specimen con­

LABORATORY

Chemicals. Catalog lists more than 10 000 organic, inorganic, and biochemicals. Structural formulas and lit­ erature references describing new ap­ plications are provided. 1480 pp. Fluka Chemical 428 Autosamplers. Catalog features chro­ matography autosampler vials and ac­ cessories, including glass and plastic vi­ als; crimp, plug, and screw cap closures; and seals, sleeves, and springs. 36 pp. Chromacol 429

SERVICE CENTER

PARTICLE SIZE STANDARDS NB5 traceable calibration standards and controls. Large assortment of diameters from 0.02 to 2000 μνη. Micro­ spheres of polystyrene, glass and fluorescent materials. Free catalog available. Toll Free 800-334-3883. In Calif. 41S-962-1100. FAX 415-962-0718 Duke Scientific Corporation

ECS • • • •

1135D SAN ANTONIO ROAD PALO ALTO, CALIF. 94303

707 fax 707

CUSTOM MADE ELECTRODES pH GLASS in tubing, rods or discs ION SELECTIVE ELECTRODES GAS SENSING ELECTRODES C02 NH

98Λ·ό493 459*4420

3

• SHORT RUNS TO YOUR SPECIFICATIONS Electrochemical Specialties 140 Branscomb Road Box 150 Laytonvjlle, CA

FREE DATA, FAST To quickly amass data on all of the products you need, consult the Lab Data Service section on our Analytical Chemistry reader reply card insert.

95454

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 combi­ nation 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" — $165; 12" — $160; 24" — $155; 36" — $150; 48" — $145.

HELP WANTED ADS ROP display at ROP rates. Rate based on number of insertions within contract year. Cannot be combined for frequency. Unit 1" (25 mm)

1-T1 $190

6-TI $170

12-TI $160

24-TI $150

48-TI $140

72-TI $130

CALL OR WRITE JANE GATENBY

ANALYTICAL CHEMISTRY 500 Post Road East P.O. Box 231 Westport, CT 06880

203-226-7131 FAX: 203-454-9939

CALL OR WRITE JANE GATENBY

ANALYTICAL CHEMISTRY 500 Post Road East P.O. Box 231 Westport, CT 06880 203-226-7131 /FAX: 203-454-9939 924 A · ANALYTICAL CHEMISTRY, VOL. 62, NO. 17, SEPTEMBER 1, 1990

USE LABORATORY SERVICE CENTER