®
New Products
DEXSIL High Temperature GC Phases Extended column life at 400° and beyond
Separate amino acids, drugs, paraffins, hydrocarbons, natural waxes, pesticides, fatty acids, steroids, alcohols, etc. - at column temperatures of 400° C and more! Routinely. With outstanding selectivity. AS-310 Automatic Sampler has 16 or 8 min iature holding cartridges. Sample size of amino acid mixtures introduced sequentially is said to be constant within 2 % . The nominal volume is 100 μL·. Resolution is equal to or better than that of chromatographic separations where samples are applied directly to the column. The pressure rating of all components is at least 600 psig. Mark Instrument Co. 407
Columns packed with Dexsil 300GC have shown negligible bleed from 20° to 450° C. Limited life applications can be performed at temperatures to 500° C. Two other Dexsil polymers-400GC and 410GC - can be selected according to appli cation, and used at temperatures t o 400° C. When used at lower temperatures up to 350° C, the Dexsils offer the advantages of using more sensitive GC settings and increasing column life because of the Dexsils' low bleed. Users report column life under routine conditions at 2, 3, 4 years and more. Dexsil is available NOW, either directly or from your regular supplier. Write for details, and an exhaustive bibliography of over 200 Dexsil applications.
DEXSIL
HPLC Columns Hi-Chrom Reversible HPLC Columns can be used with solvent flow in either direction without loss of efficiency or change in performance. The columns possess high efficiencies (50 000 + plates/m for a typical ODS reversed phase column). They are available with five different packings: ODS (C 18 ) re versed phase, hexyl reversed phase, silica, amino, and nitrile. Regis Chemi cal Co. 450
295 Treadwell Street • Hamden, CT 06514 (203) 288-3509
® Registered Trade Mark Dexsil Chemical C o r p o r a t i o n Hamden CT. CIRCLE 234 ON READER SERVICE CARD
When you take data to find answers,
Spectrometer Spectrotest is a small spectrometer uti lized in the quantitative analysis of a l loyed materials. The instrument is able to detect up to 24 elements at a given time within the wavelength range of 1 9 0 - 7 8 0 n m . Eight elements can be singled out for comparison prior to measurement. Detected intensities of the eight elements allow determination of concentrations. A typical measure ment cycle takes 3 - 6 s. Technics Elec tron Microscopy Systems, Inc. 462
V i cJ e? ο C h a. r~ t : S/70VVS
results.
Shows good, solid numbers with the peaks, slopes and valleys recorded from your instrument's output — and nothing runs offscale. Shows you clearcut integrated areas with exact values and lets you subtract background as you see fit. You can nimbly zoom the big, bright graphic/numeric display in or out through your data to spot the details and can compare records side by side, superimposed, even subtracted from one another. And the keypad works on the numbers like a scientific calculator to deliver rapid, error-free ratios, differences — results. Best of all, it shows your results for under $5,000!* •U.S.A. prices only.
V i d e o Chart
60 Church Street, Yalesville, CT 06492 (203)265-3770 Showing results at Booth 7050 in Atlantic City CIRCLE 220 ON READER SERVICE CARD 2 7 6 A · ANALYTICAL CHEMISTRY, V O L . 5 2 , NO. 2, FEBRUARY 1980
Balances PK36 has a 30 kg capacity and reads t o 0.1 g, and PK4800 has a 4 kg capacity and reads to 0.01 g. The balances can be calibrated automatically. To reduce overfill errors, the high-speed readout blanks out the last digit in the display if the weight is changing rapidly. The last digit lights up again as the weighing-in process is interrupted. For times when laboratory animals are being weighed, longer display sequences (i.e. 3 or 6 s) may be selected so the result can be read. Mettler Instrument Corp. 456
