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screening columns with different selectivities or bed heights. Columns up to 24 mm in diameter and 30 cm long can be used with the selector. Column switching can also be used to perform automated batch column cleaning, testing, or condi tioning. PerSeptive Biosystems • 408
X-ray i m a g i n g for SEM The IMK-PTS is an energy-dispersive XRF module designed to provide pixel-by-pixel X-ray spectra of scanning electron microscope images. The in strument combines digital beam con trol with a digital pulse processor to perform "position-tagged spectrome try" in which the full XRF spectrum for each point in the SEM image is ac quired in real time and tagged with the specimen χ and y coordinates. The comprehensive data set is collected as a database and subsets are selected for specific imaging or chemical map ping applications. The pulse processor contains a digi tal Si (Li) detector for enhanced sensi tivity and energy resolution at high count rates and to reduce noise dur ing the determination of lighter ele ments. The instrument detectors for the IMIX-PTS have an active area of 60 mm2 as compared with the more conventional 30 mm2 and can deter mine all elements down to boron. Specific points, lines, or regions for analysis can be selected directly from a digital micrograph display on the Sun
INSTRUMENTATION ELISA Spectramax 340 is a tunable microplate reader for fluorescence-based immuno assays and similar microplate assays. A grating monochromator replaces conven tional interference filters and allows tun ing to the optimum wavelength for a par ticular assay. The microplate reader is con trolled through software that performs data reduction and analysis and can be customized with user-programmed proto cols, formulas, and report formats. Molecular Devices • 405
Tablet dissolution
workstation, and automated data collec tion can be performed using spot col lection or variable-size rastering. The image analysis software features trans forms, filters, and image optimization functions such as grain boundary re construction, particle cutting, and edge detection. Applications packages include feature analysis with chemi cal classification, stereo depth and true surface area measurement, coatings analysis, critical dimension measure ment, grain sizing, and inclusion analy sis. An optional automation package controls all electron microscope func tions. Princeton Gamma-Tech • 406
other analytes that cannot be determined by a standard UV detector. Optical bal ance and recorder signals are displayed on an LCD panel. Polymer Laboratories • 407
LITERATURE CCD Guide to selecting electronic cameras for analytical application describes different types of CCD cameras, including intensi fied, integrating, and scientific video cam eras, uncooled "megapixel" cameras, and high-performance cooled CCDs. Advan tages and disadvantages, recommended applications, and price versus perfor mance trade-offs are discussed for each type of camera. Photometries • 410
Column selector
Scout software-controlled multicolumn switching device for perfusion chromatog raphy systems is designed for auto mated multidimensional chromatography methods development and other applica tions. The selector features two biocom patible selection valves with seven ports each and up to six different columns can be attached at a given time. Column Rl detection switching can be performed sequentially, The ERC 7515A RI detector for LC permits with multiple runs on a given column be the detection of sugars, carbohydrates, fore switching over, or with random vitamins, organic acids, alcohols, and access. Separations can be optimized by 680 A
Model 2230A is a compact dissolution sampler for HPLC with external filtering capability that is designed to sample from up to 12 vessels. It accommodates sam ple volumes from 0.1-20 mL and can be programmed through keypad commands to calibrate all six pump channels simulta neously. The sampler operates in collect, collect and transfer, and transfer-only modes; up to seven dissolution protocols can be stored in memory. Options include media replacement and direct collection into most HPLC vials, and an injection valve and transfer pump allow on-line op eration with HPLC. Distek • 409
Analytical Chemistry, November 1, 1995
FT-IR "Complete Guide to FT-IR" describes FT-IR sampling accessories for liquid and solid transmission, diffuse reflectance, attenuated total reflectance, and specular reflectance as well as beam condensers, fiber optics, FT-IR microscopes, sam pling kits, cells, windows, and software and spectral databases. New products in clude the InspectIR microsampling and videosampling accessory and the IRPlan Advantage microscope. Spectra-Tech • 411
