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BUYER'S GUIDE
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Gas humidifiers. Perma Pure, Inc., announces its ME-Series Nafion gas humidifiers that add water vapor to gases without altering concentrations of other gases already present. The humidifiers have no moving parts and are highly resistant to corrosion. These units are useful in eliminating calibration-offset errors in ambient air monitors by allowing the user to match the calibration gas humidity to the ambient humidity. 120
Gas regulators. CONCOA introduces the Series 455 single-stage cylinder gas regulators designed for primary pressure control of highly corrosive gases, including hydrogen chloride, chlorine, boron trichloride, hydrogen bromide/sulfide, and dichlorosilane. The units feature a nickel-plated forged brass body for durability and a convoluted 316-L, stainless-steel diaphragm sensitive to downstream changes. The regulators provide reliable gas delivery for inlet pressures up to 3000 psig and work in temperatures ranging from -40° F to 140° F with low-helium leak integrity 121
Solenoid valves. George Fischer, Inc., manufactures a complete line of solenoid valves for corrosive service environments, featuring internal and external corrosion resistance. Ranging in size from V$ in. to o in., the ealve ebdies are constructed of acid-resistant polyvinylchloride, polypropylene, polyvinylidene fluoride, or Teflon. Various design elements also are offered, such as moving core magnet systems with a diaphragm-sealing component or lever arm magnet systems with a moving plug sealing element. 122
FIELD TESTING
Ground-penetrating radar. Geophysical Survey Systems, Inc., introduces an
enhanced-brightness VGA color display designed to facilitate use of its SIR System-2 family of ground-penetrating radar units. This new screen, called the High-Bright Display, is more than 5 times as bright as the previous model, making the SIR-2 data easier to read and interpret in real time in any sunlit application. 123
LABORATORY
Ion chromatography columns. Hamilton Co. offers PRP-X110 ion chromatography columns designed for the low-level separation of anions. Applications include the separation of the eight common anions: fluoride, carbonate, chloride, phosphate, nitrite, nitrate, bromide, and sulfate; EPA method 300.0 Part A; and separation of fluoride from the water dip. Columns can be used to separate anions at levels from 20 ppb to 20 DDm. Various column diameters, lengths, and materials are available packed with 7 urn PRP-X110 particles. 124
MONITORING
Gas monitor. ENVATEC announces its ENVAIR 2000 toxic gas monitor, which detects 14 different gases in industrial environments, including chlorine dioxide at levels as low as 15 pp.. This combination fixed-point and/or portable unit can monitor four gases simultaneously. Proprietary "real-time" Internet-based software allows users to configure locations, gases, and reports from their desks. 125
SAFETY
Material safety data sheets. Sigma-Aldrich announces its online Super-Site at http://www.sigma-aldrich.com, which contains nearly 85,000 material
safety data sheets documenting each product's composition, hazardous properties, firefighting procedures, and first-aid treatment in case of accidental body contact. 126
SAMPLING Wastewater sampling. N-CON Systems Co., Inc., offers the N-CON Scout III portable composite sampler for the collection of wastewater and priority pollutant samples at remote or attended sites. This compact, lightweight sampler has only a minimal amount of silicone tubing and can be fitted with a Teflon inlet line and glass sample container for sampling priority pollutants. The unit may be set to collect samples from once every 7.5 minutes to once every three hours or in proportion to flow. 127
TREATMENT
Boron salt removal. Purolite Co. offers its S-108 boron-selective ion exchange anion resin. This macroporous, poly-styrenic-based product features functional groups specifically designed for the selective removal of boron salts from aqueous solutions. 128
Hydrocarbon filters. Mother Environmental Systems introduces its MYCELX-infused filters for the removal of hydrocarbons from water. The filters are effective in removing a full range of hydrocarbons in a single pass. MYCELX chemistry solubilizes the hydrocarbon compounds and binds them to its surface, preventing separation and emul-sification. The filters can accommodate a maximum flow rate of 50 gallons per minute. 129
For more information on products and services mentioned in "Buyer's Guide," use the Electronic Reader Service cards found via ES&T's Web site.
2 8 6 A • JULY 1, 1999 / ENVIRONMENTAL SCIENCE & TECHNOLOGY / NEWS