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REEVE ANGEL
PRODUCTS Tracer gas monitor Unattended measurement of tracer gases is possible with this automated monitor. T h e microprocessor-controlled electron-capture gas chromatograph is optimized for measurement of gases such as sulfur hexafluoride and selected fluorocarbons. Applications include meteorology, halocarbon surveillance, infiltration studies, and leak detection. Systems, Science, and Software 108
For years one glass microfiber filter has been the filter of choice for pollution sampling and monitoring procedures in the U.S.A.: Reeve Angel 934-AH. Now Reeve Angel 9 3 4 - A H is Whatman 9 3 4 - A H . Only t h e package has changed. Whatman 934-AH glass microfibre filters are in every way identical to ( E )the former Reeve Angel 934-AH filters. And are available from laboratory supply dealers in the same sizes and with the same characteristics. Reeve Angel 934-AH Whatman 934-AH. Whatman Paper Division 9 Bridewell Place Clifton, New Jersey 07014 Tel: (201) 773-5800
Programmable air sampler Sampler can be programmed to turn on and off within a 24-h period over 7 days. Sampling tubes for heat desorption, solvent extraction, and color detection can be accommodated. Sensitivity ranges from sub-parts per million to parts per lo-’’ in some cases. A constant-volume pump draws air through any of 23 sample tubes; sample time, day, number, and flow are automatically recorded on a built-in printer. The unit can operate for a month on rechargeable batteries. Gilian Instruments 104 Dissolved oxygen meter This hand-held unit features a 3)/2 digit LCD display, automatic 0-50 O C temperature compensation, a 90% response time of 10 s, and an accuracy of 0.1 mg/L. The electrode has a teflon membrane and 40” of cable. The range is 0-19.9 ppm. Great Lakes Instru105 ments Hi-vol calibration kit Portable device attaches to the intake orifice of the high-volume air sampler for in-house or field calibration. The calibration manometer readings are then compared with sampler flowmeter readings to generate a calibration curve. Staplex 106
Need more information about any items? If so, just circle the appropriate numbers on one of the reader service cards bound into this issue and mail in the card. N o stamp is necessary. CIRCLE 13 ON READER SERVICE CARD
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Optical hygrometer This chilled-mirror optical instrument offers a nominal accuracy of h0.2 O C with a dew point range of - 100 OF to 212 O F . A microprocessor performs continuous optical balancing to compensate for the effects of sample contaminants. Sample pressures from vacuum to 300 psia can be used. E G & G Environmental Equipment 109
Salinity drop tester Samples are dropped on a flat electrode plate to provide electric conductivity readings in the range 0.02-255 milliohms/cm. Readout is either absolute or temperature-corrected. The unit is powered by a rechargeable battery. GLA-Agricultural Electronics 110
Companies interested in a listing in this department should send their releases directly to Environmental Science & Technology, Attn: Products, 11 55 16th St., N.W., Washington, D.C. 20036
Air monitoring lbadge Two 300-mg strips of activated charcoal are contained in the badge, used to determine tirne-weighted averages of exposure to organic vapors in the air. Sampling time can range from 15 min to 16 h. The mainufacturer claims that its capacity is .3 times that of other passive monitors and its sensitivity 1‘/2 times that. A backup section in the badge contains Ithe second strip which indicates if “breakthrough,” or saturation, has occurred during sampling. DuPont. 111
Ozone analyzer Chemiluminescent analyzer has a full scale range of 0.0-1.0 ppm with a minimum detection limit of 2 ppb. An internal battery and gas source provide up to 10 h of operation. Gas supply connections and an external power supply/charger are provided for longer operating periods. Ethylene supply, battery level, air flow, and other operating parameters a r e continuously monitored; problems are indicated by an LED display and an audible alarm. Alarm and recorder outputs are provided. Columbia Scientific 117 Flowmeter Stainless steel, ‘/2” meter is designed for use with corrosive or caustic fluids. Four range scales are available: 0.5-4 gpm, 0.5-6 gpm, 1.0-12 gpm, and 0.0-16 gpm. The meters are rated a t pressures up to 3000 psi and temperatures up to 240 O F . Racine Federated 114
Differential thermal analysis Furnace has a standard operating range of up to 1500 OC and can be heated at progr,am rates of up to 100 “C per min. The system features automatic correction of baseline slope and zero offset. The microprocessor controller provides a basis for specifying and storing complete analytical methods. Perkin-Elmer 112
Stack sampler High-capacity sampler can be used for in-stack particle sizing of heavy grain loadings. The sampler fits a standard 3” port, can withstand temperatures of up to 1500 O F , and has a capacity of several grams per stage. Two impaction chambers followed by a cyclone and a backup filter thimble provide automatic fractionation into 4 size ranges. Flow rate range is 0.2-0.5 cfm. Andersen Samplers 115
Organic spill detection Two models that eliminate corrosionprone gold-lined cells and optical balancing are available. Both use a nondispersive infrared detection method; one is designed specifically to monitor compounds that other systems normally miss, including insoluble and volatile organics. Astro 113 Aqueous ClOz ainalyzer A polarographic sensor is used to detect concentration of C102 in aqueous solution. As C102 passes through the sensor, which consists of a gas-permeable membrane, gold cathode, silver anode, and buffered electrolyte, the compound is reduced a t the cathode, causing a current to flow. The current, proportional to the C102 concentration, is then amplified and displayed on a taut bandmetler. According to the manufacturer, the system is free from interference by chlorine in the sample. No reagents or s8amplepumps are required. Delta Scientific 118
TLC visualization chamber Thin-layer chromatography plates are heated in the presence of ammonium bicarbonate vapors to induce fluorescent derivatives of most organics compounds separated on the plates. The unit includes a device for removal of fumes and a stainless steel tray so reagents do not come into direct contact with the T L C plates. The chamber can also be used to char T L C plates after treating with sulfuric acid, for intrinsic charring, and for charring after spraying or dipping with most common reagents. Analtech 116
Read water toxicity in minutesinstead of days! Microtox“’acute water toxicity analyzer enables you to perform bioassays quickly, accurately and economically. Test results correlate with other bioassay techniques that require days to perform. Beckman’s rapid test uses a specialized strain of luminescent bacteria as the bioassay organism, which can be handled as simply as a chemical reagent. All you need to do is prepare the dilutions of the test sample. Test measurements are repeatable and reproducible, since standardization is more easily accomplished with bacteria than with higher organisms, such as fish. Beckman’s Microtox analyzer provides acute water toxicity measurement of a wide variety of toxicants, including phenolics, pesticides, heavy metals, aromatic and halogenated hydrocarbons, and complex effluents. For more information on the Microtox toxicity analyzer, write: Beckman Instruments, Inc., 2500 Harbor Boulevard, Fullerton, California 92634
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Volume 14, Number 9, September 1980
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