P R O D U C T CAPSULES Short "refreshers" on last month's ads. Obtain free information on any of the products or services described by writing in the appropriate key numbers in the "Product Capsules" portion of the reply card preceding this section.
Chromatographs, gas. 12" X13" X16"
Amplifiers, current. Sensitivity to 1th14 ampere, switch-selected rise times to 15 microsecond, and over 80 dB dynamic range. Literature. Ρ 76
Books. Emission Spectrochemical Analysis. Ρ 115 Books. Laser Raman Spectroscopv. Ρ Ϊ15
unit is easily transported for on-site analysis, can be used with syringes or sampling valves. Engineering report.
Amplifiers, lock-in. Unit uses hetero dyning, has tracking filter to eliminate tuning, phase-shift, and harmonic re sponse problems. Ρ 62
Books. Modern Practice of Liquid Chromatography. Ρ 115 Books. Preparative Gas Chromatog raphy. Ρ 115
Analytical services. High resolution mass spectra data at low cost. Ρ 105
Chromatographs, gas. Chromatogram and final typed quantitative re port performed in 1 minute on new data system. Ρ 104
Centrifuges, disc. Has photosedimentometer to separate and chart par ticle distribution from .01 microns to approximately 30 microns. Ρ 78 Centrifuges. 2 ultracentrifuges for fractionation, isolation, concentration, purification; 1 high speed unit to han dle preliminary preparative work and density gradient applications. Ρ 118
Analyzers. New, transient NMR solid-state unit. Leasing available. Ρ 98
Analyzers, digital. Unit records single waveform by sampling signal amplitude 20 times, converts it to an 8-bit digital number. Waveform is displayed on screen, digital output transfers waveform to input devices for permanent storage or analysis. Ρ 81 Analyzers, nitrogen. Simple-to-opcrate unit provides rapid results for an almost unlimited range of materials. Ρ 26
Analyzers, polarographic. PPB sen sitivity permits accurate simultaneous qualitative and quantitative analyses on organics, inorganics, other trace ma terials. Ρ 97 Atomic absorption instruments. Bul letins on units for routine, multi-ele ment, simultaneous analyses. Ρ 48 Balances. 18 models with high loadto-precision ratio from ± 0.001g to ± 0.05 g. Catalog. Ρ 86 Balances. Catalog describes full line of 11 digital readout, high-speed, toploading balances. Ρ 87 Baths. Xew 70° to - 1 0 ° C bath cir culator. Solid-state control provides ± 0.1 °C typical temperature uni formity of liquid. Ρ 24 Baths. 7y2 gallon capacity with tem perature range of — 20°C to 70°C ± 0.02 ° C., 8 gpm ci rculat ion. Ρ50 Biochemicals. Info on full line of acids, enzymes, derivatives for bio chemistry. Ρ 33 Bombs. Acid digestion bomb dissolves refractory materials in strong mineral acids. Ρ 100 Books. Analytical Chemistry of Sul fur and Its Compounds. Ρ 115 Books. Determination of Organic Compounds, Methods and Procedures. Ρ 115
Chemicals. Price list features ion ex change resins, anion and cation in 44 types and bead sizes. Ρ 19 Chemicals, calibration. Optically pure solvents for UV, IR, XMR; many deuterated. Ρ 32 Colorimeters. Direct-reading instru ment performs 56 tests on waste water, potable or industrial water. Ρ 55 Cryogenic units. Details on liquid helium transfer and cooling system. P3 Crystals. Info on line of nematic and cholestric liquid crystals. Ρ 36 Chromatographs, gas. Compact, dual column, single detector unit for bench top operation, designed for tem perature programming operation. Ρ 20 Chromatographs, gas. Unit has solid-state electrometer, automatic digi tal programmer with countdown timer, direct-reading pneumatic controllers. Ρ 23
Chromatographs, gas. cost, portable unit.
Info on lowΡ 29
Chromatographs, gas. 8 separate de tectors provide sensitivity and applica tions versatility. Ρ 44 Chromatographs, gas. Unit fea tures proportional temperature control for detector, has single unit design for reduced set-up time. Brochure. Ρ 47 Chromatographs, gas. Product and applications bulletins on 3 types of units. Ρ 49 Chromatographs, gas. Unit has dual column, isothermal control + 0.05°C to 400°C, and ultimate and totally usable TC sensitivitv. Ρ 65
Ρ 88
Chromatographs, gas. Unit has multilinear temperature programmer to give retention time reproducibility bet ter than 2 sec. in 19 min. Ρ 113 Chromatographs, liquid. Low-cost unit has pressurized coil pumping, low dead-volume injection port, integral solvent reservoir, UV photometer de tector. Optional accessories available. Ρ 42
Chromatography accessories. Unit ized injection port, column, and de tector for gas chromatographs. Ρ4 Chromatography accessories. Oxy gen trap supplied in reduced state readv for use, prolongs column life. P5 Chromatography accessories. Cata log lists over 150 organics, solvents, liq uids, other products. Ρ 22 Chromatography accessories. Chem ically inert columns with bores from 1 mm to 2 inches for ion exchange, gel filtration, gel permeation, adsorption, and partition. Bulletin. Ρ 27 Chromatography accessories. 48page catalog on GC supplies and ac cessories. Ρ 28 Chromatography accessories. Precoated plates for TLC and other prod ucts for chromatography. Ρ 31 Chromatography accessories. Com prehensive line of columns, zero dead volume fittings and injectors, glass col umns, other accessories. Catalog. Ρ 93 Chromatography accessories. 48page catalog lists reagents, kits, other GC accessories. Ρ 109 Chromatography gels. 2 new groups of controlled-pore-size materials: silica gel and polyvinylacetate. Ρ 39 Chromatography supports. Stable liquid phase linear polymer containing regularly spaced, three-dimensional dicarbaclosodecaborane nuclei. Catalog. Ρ8 (Continued on page 107 A)
ANALYTICAL CHEMISTRY, VOL. 44, NO. 1, JANUARY 1972
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105 A
Product Capsules (Continued from page 106 A) Data systems. Line of computers, signal averagers for use with NMR, mass spectrometry, EPR, IR, and Ra man spectroscopy. Ρ 92 Density gradient instruments. Mixer forms gradients from 5 to 50 ml in same mixer; unit removes gradients without piercing. Ρ 18 Electrodes, graphite. A new mate rial that converts graphite into silicon carbide provides surfaces which won't flake, spall, is acid and corrosion re sistant. Ρ 117 Electrodes, reference. Solid-state unit has solid unbreakable body, no glass tip, is guaranteed for 3 years. Ρ 10 Electrometers. Brochure describes 3 models featuring digital display and BCD output, internal battery power and off-ground operation, extended voltage and current and resistance changes. Ρ 96
Integrators, computing. System brings full automation to any gas or liquid chromatograph, handles up to 4 chromatographs simultaneously, can serve as many as 8 with 4 on-line at onetime. Ρ 119 Ion exchangers. 5 different tridges for water purity, in 2 sizes, need for varying levels of purity. chure.
car meet Bro Ρ 61
Ion test sticks. semiquantitative metal ions.
For detection and determination of Ρ 85
Recorders, plug-in. Details on 5-inch and 10-inch units with 1 to 100 milli volt sensitivity. Ρ 60
Kits, analysis. Analysis for alkaloids, amphetamines, barbiturates, amino acids, sugars, catecholamines, drug ex traction. Ρ 46
Samplers, flameless. Simple-to-operate systems for trace analysis deter minations in AA spectroscopy. Ρ 63
Labels. Permanent, pressure-sensitive microscope slide labels. Samples, bro chure. Ρ 103
Sampling systems. Unit increases capacity of chromatograph, eliminates variables of manual injection. Ρ 59
Lamps. Literature on hollow-cathode units for 47 different elements. Ρ 56
Services. Consulting services in chem ical, nuclear, mining, and metallurgical fields. Ρ 80
Fluorometers. Direct-reading unit serves as a colorimeter, turbidimeter, and nephelometer. Two solid state models. Ρ 13
Narcotics detection. Ion exchange resin loaded paper extracted samples can be stored, without refrigeration, un til analysis is required. Acid resin ac tive over pH range 1-14. Data sheets. Ρ1
Fume hoods. 4 types in 3 lengths of auxiliary air type hoods for use in airconditioned labs. Ρ 75 Gases. Info on calibration gases, and specialty gases and equipment. Ρ7 GC/MS systems. Can be hooked up with a computer to get stability and versatility for drug, pesticide, food flavor, pollutant, general chemical1 analysis. Ρ 21 High vacuum equipment. Catalog describes mercury float valves, Toepler pumps, mercurv diffusion pumps. Ρ 45 Integrators. GC unit with automatic baseline capacity. Brochure. Ρ 53
Ρ 66
Ion papers. New indicators in strip form for metal ions. Ρ 40
Lamps, hollow cathode. Wide vari ety to fit any AA spectrophotometer. Catalog. Ρ 11
Fraction collectors. Tabletop, refrig erated unit holds 210 test tubes in re movable racks which move in timed, counted drop, or volumetric increments. Catalog. Ρ 64
Recorders. Full range of inexpensive units, all featuring 500 Κ input impe dance, 1 mV span, and 12-inch charts. Recorders. New GC unit has ±0.25% accuracy, 9ty
