Briefs METERING MUXES FINE METERING PLUS LUS SHUT OFF CAPABILITY • Orifice sizes .020 (C v = .007) or .062 (C„ = .04) · Brass or 316 SS c o n s t r u c t i o n · M i c r o meter handle f o r exacting c o n t r o l · SWAGELOK and female NPT end c o n n e c t i o n s to 1/4" · U n i o n b o n n e t o r screwed bonnet design • Service ratings t o 5000 psi and 450°F · 100% factory tested · S t o c k e d locally f o r mmediate delivery.
Identification of Polycyclic Aromatic Hydrocarbon Metabolites in Mixtures Using Fluorescence Line Narrowing Spectrometry 1148 Six components of a laboratory mixture of P A H metabolites are directly identified using F L N spectrometry. P A H m e t a b o l i t e - D N A adducts are identified a t a level of ~ 5 adducts per 10 6 base pairs. Matthew J. Sanders, R. Scott Cooper, and Gerald J. Small*, Ames Laboratory—USDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011, and Volker Heisig and Alan M. Jeffrey, Cancer Center/Institute for Cancer Research, Columbia University, 701 West 168th Street, New York, N.Y. 10032 Anal. Chem., 57 (1985)
Correspondence
FORGED BODY REGULATING AND SHUT-OFF VAIVES
VERSATILITY TO MATCH EXACTING REQUIREMENTS • Vee, Kel-F or regulating stem tips · Flow capacities of C„ = .09 to 1.8 (20:1 range) · Choice of brass, carbon steel, 316 SS, aluminum and Monel · SWAGELOK or pipe end connections · Globe, angle and cross patterns • Pressures from vacuum to 3000 psi · Temperatures to 450°F · 100% factory tested · Stocked locally for immediate delivery. wi-34
TOGGLE OPERATED VALVES
An Exceedingly Simple Mass Spectrometer Interface with Application to Reaction Monitoring and Environmental Analysis 1153 Jennifer S. Brodbelt and R. Graham Cooks*, Department of Chemistry, Purdue University, West Lafayette, Ind. 47907 Anal. Chem., 57 (1985) Simplified Procedure for Forming Polymer-Based IonSelective Electrodes 1155 Eric J. Fogt*, Patrick T. Cahalan, Allan Jevne, and Michelle A. Schwinghammer, Medtronic, Energy Technology, 6700 Shingle Creek Parkway, Brooklyn Center, Minn. 55430 Anal. Chem., 57 (1985) Automatic Determination of Iodine Species in Natural Waters by a New Flow-Through Electrode System 1157 Eiichiro Nakayama*, Takashi Kimoto, and Satoshi Okazaki, Research Center for Instrumental Analysis, Faculty of Science, Kyoto University, Kyoto 606, Japan Anal. Chem., 57 (1985)
Abundances of Molecular Ion Species Desorbed by Fast Atom Bombardment: Observation of (M + 2 H ) + - a n d ( M + 3H)+ 1160 Ronald L. Cerny* and Michael L. Gross, Midwest Center for Mass Spectrometry, Department of Chemistry, University of Nebraska—Lincoln, Lincoln, Neb. 68588 Anal. Chem., 57 (1985) QUICK OPENING AND CLOSING, PLUS LEAKTIGHT, REPETITIVE SHUT O F F · Handle locks in place w h e n open · V i t o n O-Ring seal below spring provides low dead space a n d protects spring f r o m system f l u i d · " S n a p s h u t " action | obtained by inserting p i n in h a n d l e - S p r i n g p r o - % tected f r o m external c o n t a m i n a n t s · Service ratg i n g s t o 3 0 0 p s i a n d 200°F· Sizes 1/8" t o 1/2", g SWAGELOK and NPT e n d c o n n e c t i o n s in a varig ety of materials· 100% factory tested · S t o c k e d > locally for immediate delivery. wt-38 &*oBjïsà*- e TM Crawford Fitting Company
©1979 Markad Service Co./ail rights reserved
WHITEY® WHITEY CO., 318 Bishop Rd., Highland Hts., Ohio 44143
CIRCLE 32 ON READER SERVICE CARD
628 A · ANALYTICAL CHEMISTRY, VOL. 57, NO. 6, MAY 1985
