Environmental Analysis
Humidity Transmitter Offers Improved Connectivity The HUMICAP®
Humidity and Temperature Transmitter Series HMT330 from Vaisala (Finland) has been upgraded with LAN and WLAN communication options and a display alarm. With the new Ethernet communication options you can connect the transmitter into a computer network providing a virtual terminal connection between the transmitter and a PC. Communication is then possible using for example Telnet software. Each transmitter is given an IP address, making it a uniquely addressed device in the network. The LAN and WLAN options make it easy to add a new humidity transmitter to an existing Ethernet network. Also, applications that do not allow holes through walls and ceilings, or the installation of new cables, benefit from this solution. Display Alarm: A new display alarm function is now a standard feature in
Vaisala humidity transmitters equipped with a built-in display. With this function the user can set alarm trigger limits for two distinct measured quantities. When the trigger limits are exceeded, a real-time alarm appears on the display. More information:
www.vaisala.com/HMT330
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60 Samples in 60 Minutes The New SPECTRO ARCOS ICP Spectrometer
Reader Reply Card no 67
New Handheld Sensing System for Field Applications
Valuable real-time data can now be collected in a variety of settings with the Jaz, a handheld, field-portable analytical instrument from Ocean Optics (The Netherlands) that combines the power of optical sensing with onboard computing power. The level of flexibility Jaz provides will change analysis in custom applications ranging from crop management and environmental analysis to UV radiation and ozone monitoring.
Because of its size and versatility, Jaz is a convenient analytical tool for applications across various industries and disciplines. The spectral data collected and analyzed by Jaz can help environmentalists, ecologists and geologists take accurate forest canopy measurements, examine mineral and soil composition on- site, evaluate water quality, monitor pollution, study volcanic gas and help marine biologists and hatcheries measure upwelling/downwellling, and supply fluorescence readings to gauge the health of fish, corals and other sea life. Jaz is a family of stackable, modular and autonomous components -- a typical setup for field use is about the size of a few decks of cards stacked atop each other -- that share common electronics and communications. At its heart is a miniature CCD- array spectrometer, or light measuring device, available with user-selected grating and slit options optimized for a variety of
optical sensing application needs. Also incorporated into the Jaz stack is a powerful microprocessor and onboard display with data logging capability, so that full spectra data can be acquired, processed and stored without the need for a PC. Jaz’s Ethernet and battery modules offer additional functionality for field use. The Ethernet module has data storage capability via an SD card slot and allows users to connect to the Jaz unit via the Internet, making remote measurements possible and enabling the creation of networked sensing modules. For example, a community of Jaz users could map atmospheric ozone measurements around the world and share the data nearly instantaneously. “The Jaz system is very versatile, as our early adopter customers have demonstrated,” says Mike Kayat, Ocean Optics Vice President of Sales & Marketing. “We have customers now involved in field applications such as environmental engineering, as well as in drug discovery and materials analysis. That’s the power of Jaz – that it is easily adaptable for field, lab or process environments.”
Reader Reply Card no 65
Determination Of Sulfide in Mining Leachates Using Ion Chromatography
Sulfide is an effective reagent for the precipitation of copper and other base metals in metal winning control. For an effective and economic operation of the SART Process (sulfidisation, acidification, recycling, thickening), monitoring the sulfide concentration is essential. Normally sulfide is determined by acidifying the sample and collecting the H2S gas through a membrane in a buffer solution. The collected gas is then determined spectrophotometrically at 230 nm or after reaction with methylene blue at 600 nm. However, this offline method is very time- consuming and prone to interferences by other substances present. Coupling a gas diffusion cell to an IC with Metrohm’s (Switzerland) subsequent spectrophotometric detection is an online alternative yielding faster and more accurate results. The H2
The new SPECTRO ARCOS is an extraordinary ICP spectrometer. A particularly noteworthy characteristic is its extreme speed. Many measures ensure that the analytical results are available faster than ever before. Depending on the application, up to 60 samples per hour can be analyzed.
SPECTRO ARCOS High Performance ICP Spectrometer – Short fluid paths, automatic flush time control and high speed readout system for rapid analysis times
– Extended wavelength range and highest resolution for excellent sensitivity and precision
– Novel, extremely robust generator for absolutely stable plasma conditions
– Low maintenance UV system with minimal operating cost
Find out more about the new ICP performance class for complex analytical requirements.
S gas derived from acidification of the sample enters a gas diffusion cell where it selectively diffuses through the hydrophobic membrane into a non-UV-absorbing acceptor solution. There it is deprotonated to the IC-compatible hydrogen sulfide anion (HS–). Potentially interfering species cannot pass the membrane. Due to the selectivity of the gas diffusion cell and the direct ultraviolet absorption of the hydrogen sulfide anion at 230 to 250 mm (no post-column reagent is necessary), the overall analysis time is less than eight minutes.
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Tel. +852.2976.9162
spectro-ap.info@
ametek.com
www.spectro.com
Reader Reply Card no 68 October/November 2008
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