Varian Instruments for Research & Analysis
VarianTechtron AA Security Plan Not exactly insurance for your old age, but it's an assurance against obsolete atomic absorption spectrophotometers in your lab.
Varian Techtron provides this future protection to all owners of the Model AA-6 ! How? . . . with a total modular design built on an optical r a i l . . . a design that lets you add new capabilities or update with new components. You'll never outgrow the AA-6 . . . it will adapt to tomorrow's advanced methods, improved techniques. That's "AAS Security" from Techtron, the pioneers of AAS. Here, for instance, are modules for updating any AA-6 (or former AA-5 as well!) to provide today's top AA performance . . . more modules will become available as Techtron advances the state-of-the-art. So, start off with the Techtron AA-6 . . . tomorrow, you'll be glad you did! (A) New Simultaneous Background Corrector M o d u l e . . . Samples with abnormally high background slowing you down? Plug in this BC-6 and get
precise results faster! More accurate, too, with images from both cathode sources perfectly superimposed; and when you need maximum intensity near the limits of detectability, you can instantly flip the beam splitter aside.
(C) The Automatic Gas Control Module . . . More and more novices running your AA analyses? Switch to this 100% automatic gas control system, for total assurance against flashbacks!
(B) The Carbon Rod Atomizer Modules... Micro samples? Or concentrations below the detection limits of flame analysis? Then switch to this M63 Carbon Rod . . . a leader in flameless hardware. You can measure trace metals at lower concentrations than with any other non-flame system... and with samples as small as one microliter!
(D) Digital Indicating Module/Digital Printer... As the flood of sample data grows, just add digital modules: first the IM-6 Digital Indicating unit, should your A A have only a meter readout; then add the P r i n t e r . . . or the Data Acquisition Module. Your results are better organized, with less chance of error. For more information, circle Reader Service No. 31
Are turbid sample spectra your problem? Solution:
Problem:
A new Scattered Transmission Acces sory detector system with end-on photomultiplier tube positioned close to the sample to collect more scattered light.
Murky suspensions or cellular 3 materials that scatter too much light to allow standard absorptiometric measurements.
Spectrum of an Intact Spinach Leaf
Spectrum of a Yeast Suspension 1.0 ι
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Measuring absorbance of lightscattering suspensions or such turbid biological systems as cytochromes, flavoproteins and hemoglobins in their native state has been difficult at best. But now, with our new Scattered Trans mission Accessory, meaningful spectra can be routine. This accessory replaces the detector compartment of the Cary 118, retaining the standard cell com partment for non-scattering samples.
