Desolvating nebulizer for ICPMS The Mistral nebulization system for ICP-AES and ICPMS is designed to reduce interferences caused by the formation of oxides in the plasma torch. Inserted between the nebulizer and the ICP torch, the Mistral introduces the aerosolized sample into an explosive radiative heating system to remove most of the carrier solvent before the sample is introduced into the torch. If not removed, carrier solvent can cause oxides and other molecular species to form in the torch, creating isobaric interferences for some elements. The explosive radiative heating system is an elliptical oven with a spray chamber and an IR heat source placed at the foci. The liquid sample is pneumatically sprayed into the oven where the IR source rapidly heats the droplets to evaporate the solvent while the oven walls remain relatively cool. Excess sample vapor condenses on the oven walls and washes down continuously. The aerosol then passes through a water-cooled condenser operating at ~ 40 °C and through a Peltier cooling condenser that can be set to temperatures between -5 °C and 2 °C to remove most of the carrier solvent. Analytical sensitivity is typically 8- to 10-fold better than that obtainable with pneumatic nebulizers alone. Fisons • 405
Quartz c r y s t a l analyzer The Model QCA 917 quartz crystal analyzer is designed to integrate with a potentiostat and electrochemistry software for applications such as analyses of electrochemical deposition, polymer coatings on electrodes, corrosion, adsorption, and electrochemical reaction mechanisms at liquidsolid interfaces. The QCA 917 working electrodes consist of either Pt or Au sputtered 3000 À thick onto a Ti layer on 9-MHz AT-cut quartz crystal resonators. The analyzer measures the frequency and resonant resistance of the quartz substrate when mass changes occur at the electrode surface. It is sensitive enough to detect mass changes in a monolayer on the electrode surface, and elasticity and viscosity changes in a solution can be quantitated. When used with a potentiostat, trap applications. Sample chromatograms and instrument specifications are included. 6 pp. Scientific Instrument Services • 406
CE Application booklet contains 71 applications developed using the 3DCapillary Electrophoresis system. Topics are grouped as bioscience, pharmaceutical, environmental, or food industry applications. An additional section discusses instrumental aspects of CE. 84 pp. Hewlett Packard • 407
ISEs "Guide to Reliable pH, Ion, and Conductivity Measurements" describes applications for pH meters, combined pH electrodes, reference and glass electrodes, ion-selective and metal electrodes and meters for ISE, temperature sensors, and conductivity meters and cells. The brochure includes a table for selecting the appropriate combination of electrodes for more than 30 sample types. 24 pp. Radiometer Analytical • 408
it can track potential, current, admittance intensity, and resonant frequency simultaneously. The analyzer has two analog outputs: change in frequency (proportional to the electrode mass) and admittance. Both outputs have a resolution of 1 part in 4096. Update rates for both are set by the main unit gate time, which is variable from 0.1 to 10 s. The main unit has a resolution of 0.1 Hz and can be interfaced to a computer via IEEE-488 (GPIB) or RS232C ports. EG&G Princeton Applied Research • 409
CATALOGS
Chromatographic fittings Catalog features polymer and steel fittings for chromatography and fluid transfer. Solvent-resistant fitting materials include PEEK, Teflon, Kel-F, Tefzel, polypropylene, and Delrin. Products include highand low-pressure fittings, tubing, filters, columns and accessories, pump accessories, valves, frits, andfittingsfor FIA. The catalog includes reference charts for instruments, adapters, and functions as well as technical references such as conversion tables, an HPLC fittings troubleshooting guide, a directory of HPLC manufacturers, and a bibliography. 130 pp. Upchurch Scientific 1 4 1 0
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Analytical Chemistry, Vol. 66, No. 15, August 1, 1994 817 A
