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V A L C O MODEL 140B* High Frequency, Linear Response
Electron Capture Detector
The best available pesticide, solvent and gas analysis with no base line drift, sensitivity changes or linear dynamic range limitations •
• • •
Also available as an independent accessory and is easily connected to existing gas chromatographs Requires no source license Has history of reliability Directly compatible with standard data monitors
130 Parts per Trillion SFe in Air Single 5 Automatic Injections Injection | 3.7 sec. each | I I I I
The c h r o m a t o g r a m shows the analysis of 130 parts per trillion SFe in Air utilizing the Injection V a l c o model 140B ECD as the detector for a d e d i c a t e d SF6 analyzer. The s a m p l e size BF to Vent w a s 500 m i c r o l i t e r s , i l lustrating the sensitivity of Shown above is a representative application the Model 140B. A Valco 10 port m u l t i f u n c t i o n a l valve w i t h Helical Drive Air A c t u a t o r * (plumbed per d i a g r a m 31) w i t h 2 ea. 12" χ 1/8" s.s. Molecular Sieve 5A col umns, was used to inject the sample and b a c k f l u s h the air peak to vent dur ing the a n a l y s i s . The single injection s h o w s an SF6 retention t i m e of 1.9 seconds. A u t o m a t i c operation of the valve permits rapid SFg analysis so that repetitive injections were made every 3.7 seconds. Further w o r k w i t h a VICI METRONICS permeation tube calibrator indicated a MDQ below 10 parts per trillion.
VALCO
instruments co. houston, texas
P.O. Box 55603 H o u s t o n , TX 77055 713/688-9345
•U.S. Patent No. RE-28,981 assigned to Valco Instruments Co. Inc. " U . S . Patent No. 4.196,654 CIRCLE 223 ON READER SERVICE CARD
TWX: 910-881-5500 Telex: 79-0033
1054 A · ANALYTICAL CHEMISTRY, VOL. 52, NO. 9, AUGUST 1980
Call for Papers 1st Asian and Pacific Chemistry Congress Singapore. April 26-May 1, 1981. The meeting is organized by the Singapore National Institute of Chemistry in conjunction with the Singapore Na tional Academy of Science. The pro gram will consist of plenary lectures, symposia and contributed paper ses sions in the following fields: analytical chemistry, chemical education, ener gy, environment and health. Papers are invited on all aspects of those fields. Topics of particular interest to analytical chemists are environmental pollution by chemicals, protection of our environment, recent developments in microanalytical techniques, recent advances in chromatography, instru mental methods of analysis, and ana lytical chemistry in the development of raw materials. Abstracts comprising no more than 200 words must be sub mitted in triplicate by Nov. 1, 1980. The working language of the Congress will be English. Address all correspon dence to the Congress organizers list ed above at the following address: Sin gapore Professional Centre, 129B, Block 23, Outram Park, Singapore 0316. 5th International Symposium on Chromatography Avignon, France. May 11-15, 1981. The symposium will be held in the Centre de Congres, Palais des Papes. Discussion and poster papers on all areas of column liquid chromatogra phy and related techniques will com prise the program. All lectures will be held in English. Notification of discus sion papers and poster communica tions, together with a 300-word ab stract, should be sent to Georges Guiochon at Ecole Polytechnique, La boratoire de Chimie Analytique Phy sique, Route de Saclay, 91128-Palaiseau Cedex, France by Nov. 14. For more information, contact: Georges Guiochon at Ecole Polytechnique. 1981 International Conference on Fourier Transform Infrared Spec troscopy Columbia, S.C. June 8-12, 1981. Pa pers on all aspects of Fourier trans form infrared spectroscopy are invit ed. The meeting is sponsored by The Coblentz Society, The Society for Ap plied Spectroscopy, and The Optical Society of America. The meeting for mat will include five morning sessions of plenary and invited speakers, fol lowed by parallel afternoon sessions of contributed papers. Oral presenta-
News tions will be in English. Titles and ab stracts of submitted papers must be received by Nov. 15, 1980. Abstracts of not more than 150 words should be sent to Hajime Sakai, Astronomy Re search Facility, U of Massachusetts, Amherst, Mass. 01003. For more infor mation, contact: Bruce Chase, CR & D Dept. -328/132, Du Pont Experimen tal Station, Wilmington, Del. 19898.
PARTISIL-10
ODS-3
Meetings The following meetings are newly listed in ANALYTICAL CHEMISTRY. The 1980 meetings listed earlier ap pear in the July issue. • Symposium for Innovation in Measurement Science. Aug. 10-15. Geneva, N.Y. Sponsored by the In strument Society of America. Contact: Charles T. Glazer, Instrument Soci ety of America, 67 Alexander Dr., P.O. Box 12277, Research Triangle Park, N.C. 27709 • Ulmer Symposium Analytische Chemie 1980. Oct. 1-3. Ulm-Donau, West Germany. Contact: K. Ballschmiter, Abteilung Analytische Chemie, Universitat Ulm, D-7900 Ulm-Donau, West Germany • Symposium on New Spectro scopic Methods for Biomedical Re search. Oct. 20-21. Columbus, Ohio. Contact: Battelle's Columbus Labora tories, 505 King Ave., Columbus, Ohio 43201. Karen Waite, 614-424-4179, or Suzanne Winters, -5592. • 6th Annual Meeting of the Northeastern Association of Fo rensic Scientists. Oct. 24-25. North ern N.J. area. Contact: Mark B. Lewis, c/o Scientific Laboratory, State Cam pus Bldg. §22, Albany, N.Y. 12226
Short Courses ACS Courses. These new courses will be listed only once. For information on other ACS courses, see back issues and contact: Dept. of Educational Ac tivities, American Chemical Society, 1155 16th St., N.W., Washington, D.C. 20036. 202-872-4508
The selectivity you w a n t but with twice the efficiency in afullysilanized Os R-P column. And it costs less. New. Partisil-10ODS-3. The same selectivity as the most popular 10μηη Ci β reversed-phase column. Except: better than twice the efficiency — 27,000 plates per meter, typical. And full backbone protection — fully silanized with negligible residual silanols. No bed sinkage because of silica dissolution. Highly stable Si-0-Si-Ci8 bonds. Ideal for ion pair, ion suppression separations, too. The most durable R-P column we've ever offered. Analytical and matched prep columns; scale-up on your analytical LC unit; no need for a dedicated prep system. Partisil-10 ODS-3. One-for-one substitution for the most popular reversed-phase. With many advantages. Including price. For technical data, or to order: Whatman Chemical Separation Division 9 Bridewell Place, Clifton, New Jersey 07014 Tel: (201) 777-4825
Toxicology for Chemists New York City, N.Y. Sept. 15-17. Morris M. Joselow. $515, ACS mem bers; $575, nonmembers. Note the change from the June issue Carbon-13 NMR Spectroscopy Philadelphia, Pa. Oct. 3-5. George C. Levy, Paul D. Ellis. $395, ACS mem bers; $455, nonmembers. Held in con-
Whatman CIRCLE 233 ON READER SERVICE CARD
