NEW
PRODUCTS
Equipment Apparatus Instruments
Data analysis system features the 700A, an extremely fast electronic calculator (300 jusec add time, 3 msec floating point multiply, 3.5 msec divide, and 15 msec log»x and ln10x, trig functions are completed in less than 250 msec). The calculator will execute loops, branches, and subroutines; 12 decision-making tests are provided. It has a capacity of 12 digits plus a 2 digit exponent (range —98 to + 9 9 ) , with a dual Nixie-type 2-register display. Peripheral equipment includes the Model 703 off-line punched paper tape, the 701 output typewriter (operates 5 0 % faster than a standard teletype), and as an option, the 702 plotting output writer. Other features include special function keys and cassette tape storage. The system can process tapes from liquid scintillation spectrometers, gas chromatographs, gamma counter, or any tape equipped instrument. Output may include alpha/numeric headings, labels, simple tabular listings, and plots. 700A, $4900; 701, $1500; 702, $3500; and 703, $1950. Wang Laboratories, Inc., 836 North St., Tewksbury, Mass. 01876. 617-851-7311 401
710C flash photolysis system for kinetic spectrophotometry is capable of pumping up to 2000 joules in the photolyzing flash and uses an extremely high stability analyzing source. The units include the high energy photolyzing system, high stability kinetic system, photomultiplier, monochromator, fast response electronics, and signal output for oscilloscope monitoring of decaying species. $9750. Xenon Corp., 39 Commercial St., Medford, Mass. 02155 402
Model 8460A rotational microwave spectrometer is a new-generation easy-to-use spectrometer with good measurement resolution. Analysis is performed on substances in the gaseous state at room temperature, typically at pressure levels of 10"2 torr. Under these conditions of temperature and pressure, compounds with molecular weights as high as 350 are gaseous and thus appropriate for this kind of spectroscopy. Compounds are identified by their absorption frequencies. The instrument operates in the four waveguide frequency bands between 8 and 40 GHz; bands are changed easily without disturbing the sample. Spectra scanning and data gathering are automatic. Prices start at $40,000. Hewlett-Packard Co., 1501 Page Mill Rd., Palo Alto, Calif. 94304. 415-326-7000 403 108 A · ANALYTICAL CHEMISTRY, VOL. 42, NO. 11, SEPTEMBER 1970
New Products Low-Cost AA Spectrophotometer
The Atomspek, made by Hilger and Watts of England, offers full wavelength coverage from 193 to 853 nm. Ac curacy is better than 0.5 nm below 500 nm. A six-position turret, readout on a linear absorbance scale (meter or re corder chart), line indicator that fa cilitates wavelength selection, continu ously variable scale expansion up to 10X, digital display of selected slit width and wavelength, transistorized electronics, and optical chopper for the emission mode are features of this in strument. An optional accessory is available capable of performing 40 sep arate determinations with at least 8 reference checks in 5V 2 minutes. $4250. Aztec Instruments" Inc., 132 Water St., Norwalk, Conn. 06854. 203853-2224 404
100 MHz Nmr The miNiMaR-100 is a new 100 MHz nuclear magnetic resonance spectrome ter for proton analysis. The system consists of a compact electromagnet system and a desk-top spectrometer console. It has a resolution of 0.5 Hz and a guaranteed S/N ratio equal to or better than 30 to 1. The variable sam ple temperature range is from —70 to +170 °C. Spin decoupler and inte grator are built in. Price is $40,000 in stalled. JEOLCO, 477 Riverside Ave., Medford, Mass. 617-396-8620 405
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Thermit 10-B differential thermal ana lyzer consists of a potentiometric strip chart recorder, electronics console with DTA and TGA capability, and a highdensity alumina ceramic furnace. Also included is closed loop TC feedback with SCR proportional output power and variable frequency oscillator program drive; ΔΤ range is from 0.1 to 10 °C/in. Seven programming rates are offered to 20 °C/min. The furnace module features dual 0- to 500- and 0- to 1000°C ranges with atmospheric or gas purge capabilities. $1950. Τ & Τ Con trols Co., Inc., 310 Station Rd., Media, Pa. 19063. 215-566-8270 406 110 A ·
and other changes common to the streams. A resistor can be used as a reference instead of a second stream. Direct, single-cell measurements can also be made. $900. Wescan Instru ments, Inc., P.O. Box 695, Cupertino, Calif. 408-248-3519 409
Scanning densitometer, RFT, is a com pletely integrated unit-—reflectance, fluorescence, or transmittance modes are available from front panel selector switches. There are no modules to bolt on or mechanical changes to be made inside the unit. Other features include a high-speed integrator, quartz optics, log or linear response, automatic zeroing, sample size capability from microtubes to 8 " χ 8 " plates, high aperture monochrometer (190-700 nm half-power bandwidth of 3.5 nm) slit adjustable from 0.5 to 5 mm in length and 0.05 to 0.5 in width. $4500 to $4900. Transidyne General Corp., 462 S. Wagner Rd., Ann Arbor, Mich. 48103. 313-663-9329 407
Potassium Selection Electrode
A new solid-membrane potassium electrode brings to 15 the range of the company's selective ion electrodes for use with expanded-scale lab pH meters. Response time is 4-7 sec and pH does not seriously affect the reading. $250. Beckman Instruments, 2500 Harbor Blvd., Fullerton, Calif. 92634 410
Liquid Chromatographs
The 4100 series of liquid chromato graphs are capable of operating with column back pressures to 5000 psi. All models provide high pressure operation, dialable flow setting, column/detector temperature control, and a pulseless solvent delivery system with volumetrically controlled flow rate. Three detectors are available: a differential refractometer, a microadsorption de tector, and an ultrasensitive uv pho tometer. Detector signals are displayed on an integral strip chart recorder with special filtering for chromatography or handled directly by peripheral com puter data handling equipment. Series 4130 is a three detector/recorder sys tem; Series 4120 is a dual detector/ recorder system; Series 4110 is a single detector/recorder with the option of any one of the three detectors. Prices range from $6400 to $14,550. Varian Aerograph, 2700 Mitchell Dr., Walnut Creek, Calif. 94598. 415-939-2400 408 Differential Conductivity Meter
Model 211 differential conductivity meter permits continuous measurement of differences in conductance between two streams to within 0.005% of over all conductance. The instrument can be used to simultaneously measure con ductance upstream and downstream from an additive introduction point, or to monitor parallel streams, the refer ence stream providing a flat baseline for the altered stream despite temperature
ANALYTICAL CHEMISTRY, VOL. 42, NO. 11, SEPTEMBER 1970
Fekrumeter density determinator for solids provides actual densities with ac curacies within ± 0 . 3 to 0.5%. Sample volumes may range from 0.2 to 200 ml and they may be porous, fibrous, com pressed, solid, or viscous substances. $195. Gallard-Schlesinger Chemical Mfg. Corp., 584 Mineola Ave., Carle Place, L. Ι., Ν. Υ. 11514. 516-3335600 411
New Products
Spectrophotometer Automation System A new recording spectrophotometer automation system can be installed on either new or existing GE or B&L Spectronic 505 spectrophotometers. The system consists of a small digital computer which automatically calibrates and controls the spectrophotometer, acquires the measurement data in digital form, performs calculations, and automatically records the results in printed copy and punched paper tape. The analog curve drawing feature of the spectrophotometer is retained in addition to the digital recording of the data on a standard teletypewriter. The general purpose computer has 4096 words of core memory. Functions include automatic 100% line correction; measurements related to another standard; calculation of CIE tristimulus values X, Y, Z, and x, y under several illuminants; color difference in MacAdam units using FMC math plus the direction of color difference in yellowblue and red-green direction; and printout of %R or T, K/S, and log K/S at selectable intervals of 5, 10, or 20 nm. The system is said to be practical for production control. The cost is $15,750 installed, including minicomputer, teletype, and all interfacing. Diano Corp., P.O. Box 920, 506 Washington St., Norwood, Mass. 02062. 617-762-8400 412 Frequency Tunable Lasers The Chromabeam Series of instruments are portable, clean, dry, self-contained frequency tunable lasers. Advantages include the dialing of any color in the visible spectrum coupled with high pulse rate and extremely narrow bandwidth. Other features of these lasers include solid organic dye rods, variable speed frequency scanning, and a hinged cavity configuration. Wavelength coverage may be to customer's specification between 4000 and 7500 Â ; 1500 Â coverage per diffraction grating and 300 Â coverage per dye rode. A two-page data sheet gives specifications. Models start at $6480. Synergetics Research, Inc., University Park Plaza, Alexander Rd., Princeton, N. J. 08540. 609-452-8980 413 Micropipet Electrodes Filled and ready-to-use micropipet electrodes have tip diameters of less than one micron. The micropipet electrodes are filled with 2.5M KC1; the micropipets are available empty, or filled with distilled water. Tip potential is less than 10 mV; resistance is 5 to 40 megohms; length, 2.5 inches;
Detect, Analyze and Measure
WATER POLLUTION WITH POLAROGRAPHY
• RIVER SAMPLE NO. 1 Polarograph of river water showing copper, nickel and iron concentration at PPM levels.
R I V E R SAMPLE N O . 2 Anodic — Stripping polarograph showing zinc, lead, a n t i m o n y and copper at concentrations of less than 100 PPB.
Send for free booklet: POLLUTION & POLAROGRAPHY
SAMPLE specimen
groups
to d e t e r m i n e presence or absence of a n i o n s s u c h as n i t r i t e , n i t r a t e s , sulphate and o t h e r s .
•
DETECT
almost every e l e m e n t in t h e p e r i o d i c t a b l e — singly, or in multiples.
• M E A S U R E quantities to parts-per-million, or even partsper-billion, with anodic stripping.
CHEMTRIX, INC. Instrumentation for Science
Circle No. 24 on Readers' Service Card
You get better results when you see things our way The new Luminon spectrophotometer cells feature fully fused quartz or glass seams. ., no low melting intermediate cements to cause problems. This also insures that the cells are impervious to cleaning
