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How to simplify HPLC using low-pressure valves. Rheodyne's Technical Note 3 shows eight ways of using lowpressure switching valves to simplify method development and routine analysis in high-pressure liquid chromatography These economical 2-position and 6-position Teflon valves can be inserted before the pump or after the column. Among uses described in detail are switching between reservoirs to select the correct mobile phase for a particular routine analysis. Switching between several different solvents during method development when seeking maximum selectivity. Switching to a flushing solvent. Switching effluent back to the reservoir to conserve solvent. And switching effluent to a fraction collector
Sichromat 2 Laboratory GC has two analytical chambers that can be programmed to operate at two different temperatures over the range —150 to 400 °C. A lifting jacket on the oven is controlled as a function of the heating power for the desired temperature of the separation column chamber. The separation column arrangement can be arbitrarily extended. Instrument features include short-stroke pneumatics, microprocessor control, modularly designed injectors and detectors, and compatibility with chart recorders, printer/plotters, or large computers. Inter-oven barrier can be removed to double oven size. The GC can be equipped with eight different detectors and injectors in any sequence desired. Siemens 407
Send for Tech Note #3 All techniques are fully described in this well-illustrated 6-page technical note Contact Rheodyne. Inc.. PO. Box 996. Cotati. Calif. 94928. U S A Phone (707) 664-9050.
RHEODYNE
Nanolab 2000 and 2100 Scanning Electron Microscopes offer TV imaging up to 100 000 X, resolution to 60 A with standard tungsten emitter, and an optional LaB 6 electron source for resolution to 40 A. Alphanumerics photorecording includes kV, direct magnification, micron marker, micron bar, and automatic four-digit photo numbering, while a digital display provides kV, magnification, working distance, filament current, and emission current. Nanolab 2100 (above) offers continuously variable accelerating voltage, dual magnification, 360° scan rotation, and a 2500-line recording CRT. Applied Research Laboratories 404
THE LC CONNECTION COMPANY CIRCLE 181 ON READER SERVICE CARD 734 A · ANALYTICAL CHEMISTRY, VOL. 53, NO. 6, MAY 1981
