FACT: Only authorized

&woeèsià« T u b e Fitting Sales a n d Service

Representatives sell and service Genuine

&«Μ$ώι T u b e Fittings

Suppliers of look-alike, bogus, surplus or other substitute

fittings or components cannot guarantee . . .

G E N U I N E T U B E F I T T I N G S

No ''used" or "interchanged'" components

P R O V E N S>*** T U B E F I T T I N G P E R F O R M A N C E

Interaction of precision parts assures safe, leak-free connections Make and remake repeatability

A V A I L A B I L I T Y A N D S E R V I C E

Gageability, an exclusive feature, allows easy inspec­tion for sufficient pull-up before a sys­tem is pressurized

There is no other way to assure yourself of these guarantees. They come with the product only when you specify SWAGELOK Tube Fittings and buy them from an Authorized Sales and Service Representative. - 1983 Markad Service Co all rights reserved C-39f

• On-time delivery from local stocks

IS Technical support - Installation Safety

Seminars to train your fitters in proper techniques and help speed installation

Sy^ftj&g^àl! TUBE FITTINGS

Crawford Fitting Company, 29500 Solon Road, Solon, Ohio 44139 Crawford Fittings (Canada), Ltd., Ontario

CIRCLE 32 ON READER SERVICE CARD

Briefs

Resonant Laser-Induced Ionization of Atoms in an Inductively Coupled Plasma 1979

Laser - induced ionization signals are de tec ted in the tai l flame of an ex tended torch I C P using single-photon and stepwise modes of laser excitat ion. Gregory C. Turk* and Robert L. Watters , J r . , Inorganic Analytical Research Division, Center for Analytical Chemistry, National Bureau of Standards, Gaithersburg, Md. 20899

Anal. Chem., 57 (1985)

Background Correction Errors Originating from Nonsimultaneous Sampling for Graphite Furnace Atomic Absorption Spectrometry 1983

Significant errors in computed background-corrected absorbances arise from nons imul taneous measu remen t of the sample and reference signals. Me thods of minimizing or el iminat ing these errors are discussed.

James M. Harnly and James A. Holcombe*, U.S. Department of Agriculture, Nutrient Composition Laboratory, Beltsville, Md. 20705 Anal. Chem., 57 {1985)

Mass Spectral Analysis of Monodeuterio-Labeled Compounds Exhibiting Significant (M — H) + Peaks 1986

A method is presented for comput ing t he rat io of unlabeled and monodeuter io- labeled mater ia ls in isotopic mixtures of compounds whose mass spectra contain significant (M - H ) + peaks . Kar l Blom, Jon Schuhardt , and Burnaby Munson*, Department of Chemistry, University of Delaware, Newark, Del. 19716 Anal. Chem., 57 (1985)

Cyclic Voltammetry and Anodic Stripping Voltammetry with Mercury Ultramicroelectrodes 1989

Mercury microvol tammetr ic electrodes are formed by electrochemical deposi t ion of mercury hemispheres on p l a t i num microdisks. These electrodes are useful for fast cyclic vo l t ammet ry and anodic s t r ipping vol tammetry in quiescent solutions.

Kenneth R. Wehmeyer and R. Mark Wightman*, Department of Chemistry, Indiana University, Bloomington, Ind. 47405

Anal. Chem., 57 (1985)

Correspondence

Determination of Sulfate and Nitrate Anions in Rainwater by Mass Spectrometry 1993 Woodf in V. L i g o n , Jr .* and S t e v e n B . D o r n , Genera l Electr ic Company , Corpora te Research a n d Deve lopment , Schenec tady , N.Y. 12309 Anal. Chem., 57 (1985)

Response of Ion-Selective Field Effect Transistors to Carbon Dioxide and Organic Acids 1995 E r i c J . F o g t , D a r r e l F. U n t e r e k e r , and M a r y e S. N o r e n b e r g , Energy Technology Division, Med t ron i c , Inc. , Brooklyn Center , M i n n . 55430, a n d M a r k E . M e y e r h o f f *, D e p a r t m e n t of Chemis t ry , Univers i ty of Michigan, Ann Arbor, Mich. 48109

Anal. Chem., 57 (1985)

976 A · ANALYTICAL CHEMISTRY, VOL. 57, NO. 9, AUGUST 1985