VarianInstrumentsforResearch&Analysis
Use the new Trace Metal Pollutant Analyzer... • Measures Cd, Pb, Hg, Se, P and sixty other metals • Reads concentration in ppb to ppm directly and accurately • Handles up to five samples a minute • Requires little or no sample preparation
sensitivity up to 200X for the most critical analyses. For trace metal analysis the Techtron 1250 gives you these important instrument advantages: Determinations are simplified by automatic baseline control and simultaneous correction for back-
This new Techtron 1250 Atomic Absorption Spectrophotometer with built-in, dual-beam background correction analyzes for toxic metals rapidly, providing assurance that concentrations are below the limits set by the Safe Drinking Water Act. An optional flameless Carbon Rod Atomizer enhances
ground absorption. Integration gives precise answers; peak signal retrieval gives exact results from the carbon rod atomizer. Direct concentration of trace metals is prominently displayed in four digits. Finally, the four-lamp turret speeds measurement of several metals by keeping another element lamp ready for instant use. So, for fast trace metal analysis, specify the new Varian Techtron 1250 A A Spectrophotometer. For all the facts, circle Reader Service No. 1.
to be sure if s pure.
Sept. 22, 1975 C&EN
9
In your lab you need an LC that will do complex analytical work... Barbiturates
Vitamins MicroPnk SI-5 Analytical ?
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MicroPak NH.. Analytical
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10
20
16min
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and you also need an LC that will do tough prep... Complex mixture (Analytical)
separated by the 8500 (Scaled up to 500 mg)
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10
15
20 min
to get pure compound. (Recover 170 mg)
MicroPak SI-10 Preparative
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20
30
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With theWian 8500 Liquid Chromatograph you get both. Unsurpassed in analytical LC, the 8500 Liquid Chromatograph has also proven itself in prep. It separates com plex preparative samples, up to hun dreds of milligrams in size, and gives you the purity you need.
16 ml/min at up to 8500 psi, let you take fullest advantage of all the new high capacity, high efficiency MicroPak® Preparative Columns. Also, the 8500's UV-Vis selectable wavelength detector can be tuned to detect trace components in analytical work or detuned to detect huge preparative amounts.
Many of the performance features that make the 8500 outstanding for analytical LC, also give it extra capa bility in prep. For example, the Multi linear Solvent Programmer makes it possible to shape the gradient so you
The whole Varian 8500 system, from injector to detector, is designed to make it easier to do great analytical and pre parative LC. Let us give you the com plete story. Contact your Varian repre sentative or circle Reader Service No. 2.
10
C&ENSept. 22, 1975
can get cleaner fractions from difficult samples. Precisely controlled flow from the constant-displacement pump im proves reproducibility. Flow rates up to
VarianInstrumentsforResearch&Analysis
Pick the winning combination: GC & AutoSampler.™ First, let us help you pick the best gas chromatograph for your particular needs and budget. Varian offers 82 dif ferent gas chromatographs from which to make the perfect choice. Second, pick the best automatic sampler: Varian Model 8000, the AutoSampler that makes GC more automatic, accurate and precise than ever before. Put them together and you've got the combina tion that will do the best job for you. Start picking a winner today. Check the brief information below and have us send you complete details on the AutoSampler and on the gas chromato graphs which interest you most.
(A) 14 different 2700 models. Your best buy in a research GC; most capability per dollar. Choice of three temperature programmers. Choice of detectors. Large oven. Dual columns. Dual electrometer. Circle Reader Service No. 3. (B) 45 different 2800 models. The finest, most versatile commer cially available gas chromatographs. Include prep capability and multilinear temperature programming. For the re search chemist who must be equipped to handle any GC analysis. Circle Reader Service No. 4. (C) 6 different 2100 models. With four-column operation the 2100 will handle a larger throughput of samples than any other Varian GC. (C)
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All glass system and extra large oven make it excellent for biomedical and pesticide applications. Circle Reader Service No. 5. (D) 15 different 1400/2400 models. Varian's most popular single-column gas chromatographs, the compact 1400 series provides research performance at moderate cost. Sensitivity specifica tions equal or surpass any GC's on the market. The 2440 is Variant most economical dual-column GC. Circle Reader Service No. 6. (£) 2 different 900 models. Best buy in a low-cost, single-column GC. Simple, rugged, compact. Outper form many more expensive instruments. Widely used in education and quality control. Circle Reader Service No. 7. (F) Model 8000 AutoSampler. The 8000 Series outsamples every thing in sight. Measures and injects up to 60 samples automatically. Repro ducibility is 0.5% σ rel on an absolute basis, something no human operator can come close to. Computer compatible. Circle Reader Service No. 8. Let us help you select the GC system that will win for you.
(Ε)
(Β) (A)
(Ο)
Sept. 22, 1975 C&EN
11
Introducing the new E-Line Century Series... EPR spectrometers for the scientist who wants more. You get more E P R than ever with the new Ε-Line Century Series. We've added numerous capabilities to increase the power of E P R instrumentation. The result is more performance, new research capabilities, versatility to meet almost any E P R need, and a range of systems to meet most budgets. As for specifics, here are a few. More sensitivity. The signal-to-noise ratio is 1 20: 1 for the E-104A, 140:1 for the E-109E and larger X-band systems. There's higher resolution . . . 50 milligauss for the E-104A, 20 milligauss for the E-109E and larger sys tems. There's greater receiver gain . . . three times greater than previous Varian EPR systems. Plus other advances that add up to more capability and unique new abilities . . . for example: enhanced (difference) E P R studies, the study of E P R spectra sensitive to molecular motion in the slow tumbling region, and low temperature studies with improved A F C lock
FT NMR... simply routine.
There's more versatility, too. This is reflected in the kinds of studies possible and the kinds of samples that can be studied. There's also a wide range of systems to choose from. Systems with 4-, 9-, 1 2-, or 1 5-inch magnets, as well as con versions if you already own a magnet. Century's modular design lets you select the capabilities you need today, yet add modules later for expanded capabilities. Thus you can tailor your system to your budgets as well as your capability needs. And behind every Century Series E P R System stands the stability and service of the major E P R manufacturer who helped make EPR a laboratory reality. When you add it all up, you get more with Varian EPR. Want to know even more'/ Circle Reader Service No. 9.
If Fourier transform N M R has be come a routine procedure, the Varian C F T - 2 0 N M R Spectrometer takes much of the credit. It's completely program m a b l e — all the operator does is enter the appropriate commands on a key board, and the CFT-20's built-in com puter supervises and performs the experiment automatically. It even alerts you to input errors through its alpha numeric display. Foremost, the CFT-20 is a research N M R spectrometer. It will handle your equilibrium work and your Tj relaxation experiments with exceptional ease. And because it's so simple to operate, the CFT-20 is also a great analytical tool. Its high sample throughput lets you pain lessly do the repetitive data gathering that is typical for many analytical projects. Versatility? It will do equally well with protons as with l:î C or : ! , P. You can make the CFT-20 as sophisticated as you wish. There is an accessory for variable-temperature experiments and a Homospoil Accessory, which eliminates spectral artifacts caused by residual X-Y magnetization. And there is the IBM-compatible, flexible-disk data system for storage oi' your programs and spectral information — simple, yet highly accurate and reliable. For more information, circle Service No. 10.
Reader
Varian InstrumentsforResearch & Analysis
Extend your range in UV-Visible spectrophotometry. 170 nm
NewCary118CX
170 nm
Far-UV 118
185 nm
This new Varian Cary 118CX covers the range of two instruments... and performs better than either! A remarkable new photomultiplier detector extends the wavelength range to 170 nm, further into the UV than any other spectrophotometer... yet loses none of the visible range! In fact, performance in the visible is significantly
800 nm
600 nm
Standard Cary 118
800 nm
better: at 800 nm the signal-to-noise ratio is improved 100 fold! Biochemists can now observe both visible chromophores, such as chlorophyll or other photosynthesis pigments, and far-UV chromophores such as peptides. ..with no change in the instrument. Inorganic chemists can study charge transfer complexes far into the UV and,
on the same run, observe visible chromophores such as copper salts...with no loss in performance. Besides its extended range, the Cary 118CX offers superior capability for analyzing micro samples, high absorbance or turbid samples . . . a unique calibrated zero suppression...a reversing scan and chart drive for overlaying spectra...and many other exclusive conveniences. With this time-proven leader now even further ahead, why take a chance? Specify the Cary 118CX... from Varian of course. For all the facts ask for our new 118 brochure; just circle Reader Service No. 11. A 118 Bonus! With our standard high intensity tungsten-halogen (visible) source, you can run continuous spectra from 800 nm all the way down to 220 n m . . . without changing over to the deuterium (UV) source... and with no significant loss in performance! For an Application Report on this "extended scanning'' circle Reader Service No. 12.
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