New Products
Spectrophotometer The Model 42 spectrophotometer sys tem includes a spectrophotometer, op erational between 340 and 650 nm, a microprocessor, and an integral printer. The system is available in two versions: a heated "sipper" flow cell, tempera ture-controlled at 25, 30, or 37 °C ($5900), and an unheated four-position manually operated cell holder version ($5300). A digital display shows absorbance, wavelength, and sample cell tem perature. Memory Pac plug-in modules permit permanent storage of setup pa rameters. One to five analyses can be stored per Memory Pac. The test pa rameter can be stored permanently on the Memory Pac. A 500-/U.L sample is needed for analysis. A pipetor/diluter for automatic sample preparation is op tional. Beckman 409 Pore Sizer 9300 Mercury Intrusion Porosimeter measures pore diameters from 500 to 0.006 μπ\ with a resolution of a fraction of a micrometer. The bench-top model has low and high pressure sections that operate independently. The low pressure section accommodates one or two penetrometers (sample cells). Samples are evacuated, filled with Hg, and pressurized to atmospheric pressure. An external pressure source permits operation to 30 psia. In the high pressure section, one penetrometer can be pressurized to 30 000 psia. Intrusion and pressure are continuously displayed digitally, pressure in either psia or MPa and intrusion in pF. Sample cells accommodate solid samples up to 1-in diameter by 1-in long and powder samples up to 15 cc total bulk volume of both low and high porosities. Micromeritics 405
X-Ray Fluorescence Spectrometer The Model 0700 X-ray fluorescence spectrometer contains a microproces sor interfaced to the analyzer main frame and DEC PDP/11 Minicomputer. User and microprocessor/computerselectable parameters include: sample position (16 or 24 positions); secondary target position (six targets on a turret); direct or secondary target X-ray tube position; X-ray high voltage (0 to 60 kV in 1-kV steps); X-ray tube current (0 to 2 mA in 0.1 mA steps and 0 to 1 mA in 0.01 mA steps); and transmission filter/ collimator selection. X-ray output stabil ity is within 0.25% for any 8-h period in a 24-h duration with tube current from 0.01 to 2 mA and tube voltage from 6 to 60 kV. This permits precisions of less than 0.5% relative for the combined analysis system. Reproducibility of ver tical sample positioning is within ± 0.002 in. Kevex 408
For more information on listed items, circle the appropriate numbers on one of our Readers' Service Cards
Preparative HPLC Column Magnum 20 columns yield approximate ly 5 g of sample in a single pass without recycling and can be used on most con ventional LC analytical instruments. Ef ficiency of the reversed phases is ap proximately 20 000 plates/m. Columns are smooth bore No. 316 stainless steel, 20 mm ID and are available in 25and 50-cm lengths. Columns may be or dered with any of the following Partisil 10-μηι packings: silica gel; C 18 re versed phases; C 8 reversed phase; amino-cyano polar phase; strong anion and strong cation exchanger. Whatman 414
Water Purification System Labs II and IV provide ASTM/CAP type I and II water, respectively, by incorpo rating prefiltration, reverse osmosis, activated charcoal, nuclear grade deionization resin, and a 0.2 μ final fil ter. Lab II can produce 94.5 to 189 L/d of water while Lab IV has a production capacity of 56.5 L/d. Both systems have 19-L storage tanks and a draw rate of 1 L/min. Technic 425
1440 A · ANALYTICAL CHEMISTRY, VOL. 52, NO. 13, NOVEMBER 1980
Reporting Integrator For use with analog GC, LC, and TLC, the HP 3390A integrator has a built-in printer/bidirectional plotter that records peaks and alpha-numerics at 48 characters/s on thermal paper 10.80 cm wide. The integrator calculates percent area, internal standard, normalization, external standard, peak height, and peak area. The unit has built-in printer/ plotter diagnostics, a 1150 peak memo ry capability, and integration logic marks on the printer/plotter. Nine sets of parameters can be stored and re called. An optional sampler/event con trol module is available for automation of valves and contact closures and to control peak integration with integratortimed events. $2600. Hewlett-Packard Co. 411
Fuse Splicer for Optical Fibers The compact portable splicer fuses sin gle or multimode glass optical fibers in less than 30 s. FIBERWELD Model 2030 operates from a variety of external power sources or from built-in re chargeable batteries, making it applica ble to laboratory work, field installation, and repair of optical fibers. The perma nent splice is made via an electronic (arc) discharge. Precise fiber alignment guarantees splices with average losses of 0.25 dB. The splice arc is electroni cally interlocked and enclosed for oper ator safety. Fibers may be spliced in vertical or horizontal orientation. DC arc current and duration are digitally controlled. Times Fiber Communica tions 415
New Products Disposable Ion Selective Electrodes
PU4000 Isocratic Liquid Chromatograph is designed for high-volume, repetitive analyses. The dual-head reciprocating pumping system includes close-tolerance sapphire pistons and a large digital front-panel display for monitoring system operating pressures up to 400 bar. The range for solvent flow rates is 0.1 to 9.9 mL/min. An optional accessory increases solvent flow rate to 29 mL/min, and an optional solvent module provides safe storage of solvent réservoirs with independent control of He degassing for two solvents. The UV detector features reference-compensated optics, master-blazed holographic grating, a sensitivity of 0.005 AUFS, and minimal response to flow change and refractive index effects. The system is compatible with other modules in the Pye Unicam LC range. Pye Unicam 403
Purity Analysis Computer Program The DSC Dynamic Purity computer software program calculates compound purity from data collected with the company's 910 Differential Scanning Calorimeter module of the 1090 Thermal Analysis system. The software is supplied on a standard floppy disk that accepts 8 h of analytical data. Final test reports are produced in publication-quality form. Major applications are in the pharmaceutical and fine chemicals fields. $950. Du Pont 410
Selective for Κ and Ca, these miniature electrodes are intended for use in bio logical fluids and aqueous solutions. The Κ electrode is effective from 0.10 to 100 meq K/L between 5 and 50 ° C . Electrode response time is less than 100 ms for a double concentration change, and the drift of an equilibrated electrode is typically less than 1 mV per 24 h with repeatabilities of ± 1 mV. Electrodes are constructed having di ameters of 1 m m and are available in three configurations: the standard dip type; the flow-through type; and the catheter type, used primarily for bio medical research. Electrodes are oper ational for 1 to 12 months depending on their use and are replaceable at a cost of $75. Reference electrodes are $40. lonetics 412
Dissolved Oxygen Detector Model 2716 measures dissolved oxygen in water in the ranges 0 to 1.999, 0 to 19.99, and 0 to 199.9 ppm. An accura cy of ± 1 % of the signal is achieved with the waterproof instrument when the measurement is within 5 ° C of the calibration temperature. Temperature is displayed with an accuracy of ± 0 . 2 ° C . In clean water, the maximum drift of sensitivity is ± 0 . 5 % per month. Forced agitation is unnecessary in most appli cations. Response to a concentration change is 9 9 % complete in 7 min at 25 ° C . The Model 2105.01 Sensor is an available option that permits oxygen de termination in water saturated with H 2 S. The Model 2716 is provided with an in ternally rechargeable battery that oper ates from 110 to 220 V, 50 to 60 Hz. Orbisphere Laboratories 419
UV/vis Spectrophotometers
Gas Glow Planchet Sample Changer
UVIKON Models 810 and 820 UV/vis spectrophotometers are operational from 185 to 900 nm and use halogen and deuterium light sources. Bandwidths for the 820 model are preselected at 0.5, 1, 2, or 4 nm. The 810 model operates with a bandwidth of 2 nm un less manually changed to 0.5, 1, or 4 nm. Total bench space for each is 44 X 36.2 in, including recorder. Both instru ments feature computer-optimized op tics, digitalized electronics with micro processors, and individual memory files. A concave, holographic grating offers 1500 lines/mm resolution. A new calculation is performed every 15.5 ms. Kontron Analytical 418
The Alphalobetamat Gas Flow Planchet Sample Changer Type PSC1/D counts alpha and beta samples simultaneously or separately. Applications in radiation counting at environmental levels in clude: sampling of radioactive aerosol contamination using high speed sam ples; filter counting; evaporated water sample counting; and dried organic sample counting. Sample trays are in dependently coded, and the print-out sequence gives sample number, time, and counts. The system may be oper ated in single cycle, single cycle and reset, multicycle and single sample modes. It can run unattended for 24 h/d. Nuclear Enterprises Ltd. 421
HPLC Electrochemical Detector The ED-100 HPLC electrochemical detector measures current voltammetrically or amperometrically using solid electrodes or a dropping mercury electrode. Use in the reductive mode permits detection of compounds such as esters and aldehydes, while use in the oxidation mode detects compounds such as catecholamines and aromatic hydrocarbons. Electrode configurations are variable. Sensitivities are typically 1 0 - 1 2 M with solid electrodes and 1 0 - 1 1 M with dropping mercury electrodes. Response ranges from 10~ 7 M to 1 0 - 1 2 M with solid electrodes and from 1 0 - 7 M to 1 0 - 1 1 M with dropping mercury electrodes. Cell volume ranges from 0.2 to 18 μ ι depending on the op eration mode. Astra Scientific Interna tional, Inc. 413
Ektachem Serum Electrolyte Analyzer is an automated system for determining sodium, po tassium, chloride, and carbon dioxide in serum. Cups containing patient samples are positioned under a metering station where individual sample tips aspirate the sample from the cup. The metering head is moved to the spotting station. A slide containing the necessary reagents and two thin-film, ion-selective electrodes joined by a paper bridge is advanced into position. The patient sample and reference fluid are released onto the slide. The slide moves to the read station where the electrolyte concentration is determined after 3 min and displayed digitally. Results are printed on a paper tape. A built-in microprocessor signals the operator when the analyzer is not operating according to specifications. It stores the calibration parameters and checks the status of various functions on request. Eastman Kodak Co. 404
1442 A · ANALYTICAL CHEMISTRY, VOL. 52, NO. 13, NOVEMBER 1980
New Products
Scanning Macro-Porosimeter for large pore (200-0.35 μ) applications displays pressure and volume data digitally and via XY recorder. Maximum achievable pressure is 300 psia with an accuracy of 0.25 %, full scale. Intrusion/extrusion scans require ~ 5 min to complete. Continuous intrusion/extrusion curves are provided in the modes: volume vs. pressure or pore radius from vacuum to 300 psia full scale or to 30 psia full scale on a 10X scale expansion mode; volume vs. Log Ρ or radius in a logarithmic mode; volume scale expansion capability up to 300% of full scale. An RS-232 Serial Data Link is available for data transfer to any computer for further data reduction. Volume accuracy is 1 X 10 4 cm 3 . Quantochrome 401
Video Hard-Copy Printer
Nitro-Group GC Detector
The Axiom EX-850 produces perma nent copies of the video display of the spectra produced by the company's IL451, IL551, and IL951 atomic absorp tion spectrometers and the IL Plasma100 ICP spectrometer. Produced on aluminized paper, production of a 3.8 in X 5 in copy requires 14 s. The hori zontal 5 in-dimension may be enlarged to 10 in. Information included on the video screens and reproduced by the printer includes statistics, curves, and graphs. Delivery is six weeks ARO. In strumentation Laboratory 416
The Thermo Electron TEA Model 543 Analyzer is a GC-optimized detector se lective for thermally labile nitro- and nitrosyl-releasing compounds of better than 107 to 1 vs. other nitrogen-contain ing compounds. Minimum sample prep aration is required, and detection limits are better than 0.1 ng. Reproducibility is better than 2.5%. The analyzer mea sures 22 X 24 X 19.5 in and operates without external plumbing or gases. Pyrolysis temperatures from 350 to 1000 °C permit analysis of compounds with various cleavage ranges including nitrosamines, nitroaromatics, antiangi nal drugs, and explosives. $17 800. Thermo Electron Corp. 422
Sorption Microcalorimeter Designed for measurement of surface properties and reaction of solids with liquids or gases, the sorption microcal orimeter investigates parameters such as specific surface area, porosity, im purity effects, number of adsorption sites, mechanism of desorption, kinet ics of sorption, and catalytic phenome na under static and dynamic conditions. Removable Batch and Flow Sorption re action cells permit sample pretreatment outside of the unit. Determinations are completed in 2 h. Maximum tem perature limits outside of the unit are: flow cell, 180 °C; batch cell, 480 °C. Thermopile detector is a twin arrange ment, one set on each side of the reac tion cell. The bath is thermostatically controlled for operation between 22 and 60 °C. Minimum detector sensitivi ty is 0.5 μν/μνν (flow stopped). Power requirements are 220 V and 50 Hz. LKB Instruments, Inc. 424
High-Speed Digitizer Module The NIC-174 plug-in module is a singleinput buffered digitizer intended for use with the Nicolet 1170 signal averager. Uses include high-speed signal averag ing applications such as reaction kinet ics studies and pulsed laser experi ments. Maximum speed in the buffered mode is 10 MHz with 8-bit resolution; capabilities for dual timebase and pretrigger recording are included. In nonbuffered mode, maximum speed is 1 MHz. Single-input pulse counting at rates up to 20 MHz is included, with a deadtime of nearly zero. The 174 com bined with the 117 mainframe signal averager offers a duty cycle of 100% in the nonbuffered mode and sweep repetition rates up to 750 Hz in the buf fered mode. Nicolet Instrument Corp. 423
Building Integrity into Integration.
CSIs Supergrator Series: 17 Years in the Making of Low Cost Reliability The CSI Supergrator series is the result of 17 years of building digitizing instruments for the analyt ical laboratory. The NEW Supergrator 3A provides n e w auto sampler capability at a price that justifies a stand-alone system. It au tomatically provides multi-program storage and all of the calculations that are necessary for accurate and precise results. The Supergrator 3A offers an swers with user-designed flexibility and program ming parameters. Compare with any other System •Flexibility •Expandability •Versatility «Proven Design •Reliability «Low Cost •Built-in Self Diagnostics Call or write today for complete information or free demonstration.
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CIRCLE 39 ON READER SERVICE CARD ANALYTICAL CHEMISTRY, VOL. 52, NO. 13, NOVEMBER 1980 · 1445 A
New Products Hybrid Scanning System for Transmission Electron Microscopes The hybrid scanning system is designed to be used with any Philips EM 400 transmission electron microscope having a scanning capacity. Rocking beam or subspecimen scanning allows a diffraction pattern to be displayed using a scanning monitor and provides for possible on-line diffraction analysis. Full use can be made of all STEM capabilities. A feature of the system is conical scan with an adjustable angle of tilt and a manually or automatically controlled beam rotation. N.V. Philips' Gloeilampenfabrieken 417 UV/vis Spectrophotometric A b s o r b a n c e Standards The set includes nine filters permitting a check up to 3 A. The effect of reflections is compensated for by providing a clear glass filter in the set for zeroing. To prevent distortions and inaccuracy, the filters are mounted in a frame that puts no physical stress on them. Sargent-Welch Scientific Co. 420
Chemicals A m y l a s e Reagent Enzymatic amylase reagent, DeltaTest Amylase (UV) is a lyophilized, singlecomponent reagent that produces glucose when it acts on a modified carboxymethylated starch substrate in the presence of glucoamylase. The glucose produced is measured kinetically at 340 nm using hexokinase and G-6-PD. The reagent is available in 10 X 6.5 mL and 10 X 16 mL put-ups. After reconstitution, the reagent is stable 8 h at room temperature, up to 3 h at 37 °C, and 3 d when refrigerated or frozen. Upper limit for the reagent's dynamic range is 2000 U/L. The normal range at 37 °C is 74-258 U/L. Adaptable to automated instrumentation, it can be used at 25, 30, or 37 °C. Princeton Biomedix 428 L a c t a t e Ester S o l v e n t s The solvents are sugar-derived vs. petroleum-based. Three forms are available: ethyl-, isopropyl-, and butyl-lactate. Each is a clear, colorless, nontoxic liquid of low volatility, manufactured from L (+) lactic acid. The esters are miscible in the following organic solvents: aliphatic and cycloaliphatic hydrocarbons, aromatics, chlorinated hydrocarbons, alcohols, esters, ketones, DMF, DMSO, and water. Limited miscibilities are observed for ethyl lactate with the higher alkanes (e.g., octane) and for butyl lactate with DMSO and water. Ethyl lactate has a high tolerance for water. High dilution ratios are observed. Pettibone-Chicago, Inc. 429 Ferruginous Bauxite R e f e r e n c e Material
Headspace Analyzer HS 250, an accessory to a GC, avoids permanently restricting one GC to headspace analysis. Designed to fit all Carlo Erbe Strumentazione 2000 and 4000 Series GCs, the HS 250 can be used with packed columns, WCOT or SCOT capillary columns and used during multidetector operations when flame ionization, sulphur selective, nitrogen or phosphorous, or wire detectors are in use. Specifications are: temperature range 30-120 °C; sample size up to 2.5 mL vapor; solid sample size 1-2 g; liquid sample size 0.5-5 mL liquid. Analysis may be programmed up to 99 min. Carlo Erba Strumentazione 402
The material was prepared and analyzed by more than 12 international laboratories. The following are the provisional values for the major compounds: A l 2 0 3 % = 37.38 ± 0.40; Fe 2 0 3 % = 35.83 ± 0.61; S i 0 2 % = 1.21 ± 0.08; and T i 0 2 % - 3.15 ± 0.10. To obtain a 50 g (
