Put your samples on a salt-free diet Tired of cleaning salt plates? Try quick and easy 3M Disposable IR Cards.

These disposable sample cards fit major FTIR spectrometers and reduce time-consuming sample preparation. Samples are applied directly onto the microporous, polyethylene substrate, which quickly absorbs and holds the analyte. Since the cards are disposable, the risk of cross-contamination is eliminated. Likewise, no more sample clean-up translates into savings in both time and supplies.

3M Disposable IR Cards are non-hygroscopic and require ,, no special storage or handling. They work most favorably with I organic liquids, samples soluble in organic solvents, and Λ semisolids or pastes. The cards are especially effective with <Ç-water-containing samples.

To order 3M Disposable IR Cards, contact either Fisher Scientific or VWR Scientific. 3M Disposable IR Cards (25-pack)

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CIRCLE 74 ON READER SERVICE CARD Ei

Make Chemistry Relevant to the Real World ...with What's Happening in Chemistry?

Show students how research in chemistry solves problems in the real world. With the more than 25 research highlights from What's Happening in Chemistry?, your classes can read about how recent developments in chemistry may lead to:

• Finding cures for cancer and AIDS. • Building stronger, longer-lasting roads. • Controlling the ripening of fruit. • Reproducing the strongest and most elastic of all known fibers, spider silk. What's Happening in Chemistry? helps students see chemistry as a living, breathing

subject. An excellent catalyst for discussion and inquiry!

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Send me What's Happening in Chemistry? (1992) 56 pages, ISBN 8412-2217-7, $8.95/copy. Please include $1.00 for shipping.

D My check made payable to American Chemical Society is enclosed. Π Please bill my institution. (Purchase Order enclosed.'

Name. School/Office.

Address _ City. State. Zip. Mail to: American Chemical Society, Public Communication, 1155 16th St., NW, Washington, DC 20036

Discounts for multiple copies available. Call 202/872-8729.

ANALYTICAL CHEMISTRY, VOL. 64, NO. 19, OCTOBER 1, 1992 · 941 A