Calibrate your gai analyzer... objeitiuely.

The Metronics Dynacalibrator gives you calibrations traceable to NBS standards for almost any gas analyzer or gas chromatography in the lab or in the f ield. That includes units you've rigged up yourself, and even instruments with suction rates up to 25 / /m in . And since calibration is our only business, you get an in­strument that's coldly precise, easy-to-use and competit ively priced. Key Dynacalibrator features include: • Oven control within ±.05°C, NBS

traceable • Variable oven temperatures up to

50°C, 110°C optional • Flow calibrated and stable to

within 1 % of each individual reading

• Our own calibrated permeation devices, certif ications traceable to NBS standards

• Continuous, unattended automatic or remotely-controlled operation

• Optional " in-transi t" maintenance of purge and temperature

• Dynamic gas concentration ranges of 60:1 The result? Calibration that's

above suspicion—your best insur­ance against costly errors. Three models meet every requirement. For details and a demo, call or wri te: Metronics, 2991 Corvin Drive, Santa Clara, CA 95051 Phone: (408) 737-0550. Telex: 35-2129.

Metronics Calibration you can

count on. CIRCLE 139 ON READER SERVICE CARD

Marine Chemistry in the Coastal Environment

ACS Symposium Series No. 18

Thomas M. Church, Editor

A special symposium sponsored by the Middle Atlantic Region o/ the American Chemical Society.

Now available—a comprehensive volume containing the most recent advances in this new and increasingly important field.

The collection represents an indispensable source of information for every marine scientist. Emphasis is not merely on de­scribing coastal problems but on showing the potential in applying the tools of modern oceanography and chemistry to solve these problems.

Forty-one chapters cover six major areas: physical, organic, and tracer marine chemistry; estuarine geochemistry; hydro­carbons and metals in the estuarine en­vironment; ocean disposal forum; applica­tions and resources in marine chemistry; and organic and biological marine chem­istry.

710 pages (1975) Clothbound $35.75 (ISBN 0-8412-0300-8) LC 75-28151

SIS/American Chemical Society 1155 16th St., N.W./Wash., D.C. 20036

New Products

GC/MS Data The Riber 150 computer control and data acquisition system for quadrupole GC/MS instrumentation is a powerful and flexible approach to atuomating a GC/MS system. It permits the operator to set run conditions, specify maximum run time, and leave the system unat­tended to acquire all of the desired data. The Riber 150 will control multiple ion detection, handle up to eight differ­ent masses or mass ranges, and moni­tor an unlimited number of mass sets. Output can be a digital presentation of either GC or MS data on a CRT. The system can be easily tailored to meet specific laboratory requirements. Riber Data Systems, Inc. 416

Computing Data Acquisition Device The Model 97S I/O calculator combines the HP-97 programmable printing cal­culator with BCD interfacing to provide data collection and computation from a wide range of instruments. The HP-97S manipulates the data according to user-designed programs and produces a printed hardcopy report. With the cal­culator, the user can take an instrument measurement and compare it to a stan­dard or calibrate in data, do computa­tion on each individual reading, or take multiple measurements and conduct computation and statistical analysis. Basic system is $1375. Hewlett-Pack­ard Co. 420

Series 30 multichannel pulse height analyzer features a 9-in. diagonal CRT, 1024 channel memory, and both PHA and MCS data acqui­sition modes. Digital integration, spectrum compare, and I/O interfacing for TTY, EIA devices and digital cassette are included in the basic unit. Plug-in options are available for a detector bias supply, high-resolution amplifier, and various additional I/O interfaces. Canberra Industries, Inc. 404

For more information on listed items, circle the appropriate numbers on one of our Readers' Service Cards

366 A · ANALYTICAL CHEMISTRY, VOL. 50, NO. 3, MARCH 1978

Please send copies of No. 18 Marine Chemistry in the Coastal Environment at $35.75 per book.

Ο Check is enclosed for $ Ο Bill me. Postpaid in U.S. and Canada, plus 40 cents elsewhere.

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