Micro Tek MT 220 Gas Chromatoqraphs for biomedical and pesticide analyses The u n i q u e glass sleeve insert for the MT 220 inlet system serves as a waste t r a p to r e m o v e residue from crude samples and allows only vaporized constituents to be carried into the column. The glass sleeve is easily removed from t h e inlet for on-column injection or for cleaning purposes. The MT 220's n e w solid state dual channel electrometer is compatible with all ionization detectors. Looking for phosphorus or sulfur? How about: • Parts per billion sensitivity for Ρ and S bearing compounds without response to large excesses of other organics • Simple clean up procedures in pesticide analysis with high efficiency plus simultaneous flame photometric and flame ionization measurement?
...andincludinqFLAME PHOWMETRtC detection for Ρ § S In addition to t h e now-proven Ni63 Beta source Electron C a p t u r e detector, flame photometric detection yields particularly excellent analyses for phosphorus or sulfur. Circle No. 177 on Readers' Service Card
Micro Tek GC 2000R, the Research Model Gas Chromatoqraph
Any known type of column switching can be performed: • Injection into either column • Series-parallel columns - Series-reserve operation • Backf lush of heavy components
Those laboratories who have now used a GC 2000R for several years can appreciate fully the reliable results and high flexibility offered. No chromatograph system has a m o r e complete valve a r r a n g e m e n t ; you m a y use both gas and liquid sampling valves on the dual septum inlets. A column-switching valve and back-flush valve can be installed simultaneously in the heated valve oven. You h a v e four detector options and detector changes are m a d e without removing a n y units. Circle No. 178 on Readers' Service Card
New DTA systems from R. L. Stone
Full DTA capability from —150° C. to +1600° C, 10—β torr to 3000 psia, plus interchangeable sample holders for all purposes.
You note a small inflection in your t h e r m o g r a m . It could be a glass transition . . . or an i m p u r i t y . . . or m a y b e just an i n s t r u m e n t error. R u n it again. Then w h a t ? Typical repeat r u n s with the n e w Stone DTA systems provide you with t h e ultimate in resolution and sensitivity. Find out w h a t DTA performance u p to t h e "Stone S t a n d a r d " can m e a n in your analyses. Circle No. 179 on Readers' Service Card
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Analytical instruments from TRACOR AA-110
TRACOR, Inc. / 6500 Tracor Lane / Austin, Texas 78721 / (512) 926-2800 See ACS Laboratory Guide for All Products/Sales Office
VOL. 39, NO. 14, DECEMBER 1967
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