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Environmental Laboratory Dissolved Gas Measurement with Membrane-Assisted MS
The Hiden (UK) HPR-40 family of membrane separatorassisted mass spectrometers continues to expand to meet the needs of new investigative and processing techniques requiring measurement of dissolved gases in aqueous solution. New additions include an adaptable cuvette-style sampling cell for measurement of photo-sensitive reaction products and an innovative electro-chemical cell for characterisation of electro-catalytic activity.
The semi-permeable membrane provides an efficient water barrier yet preferentially transmits gaseous species, enabling real time mass spectrometric analysis of dissolved gases and vapours. Separators are available for in vivo immersion in active media, for static samples and for flow-through and recirculatory applications. Options include integrated media agitation, precise thermal regulation of the active sample and programmable multi-stream selection for multiple samples.
The compact mass spectrometer module is benchtop and cart-mounting compatible, with comprehensive control and data analysis programs for both automated and manual operation. Multiple sampling lines can be accommodated for sequential multi-media sampling, the QIC BioStream variant currently operating with up to 80 sample streams. A custom-design service is available to assist with interface design for specific R and D projects.
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Gas Chromatographic Separation now
Combined with Real-Time Trace Gas Analysis
Ionicon (Austria), manufacturer of PTR-MS real-time trace VOC analysers, presents an innovative accessory for its successful PTR-TOFMS series.
Ionicon PTR-TOF systems are capable of measuring trace gas samples in real-time with a high mass resolving power. The new “fastGC” module adds an optional chemical separation step before the analysis. The module consists of a short GC column with an advanced heating concept for ultra-fast heating and equally fast cooling rates which makes this pre- separation step nearly real-time.
“A key advantage of PTR-MS is to see trace concentrations in real-time. Compare to the discrete and time consuming sample analysis in GC-MS, the introduction of PTR-MS back in 1998 has been like the step from one high-resolution picture to a full movie”, says Dr. Alfons Jordan, co-founder of Ionicon.
A full PTR-TOF spectrum can be acquired every 100 ms –18,000 times faster than a typical GC spectrum, which can take about 30 minutes. However, the GC can separate compounds according to their chemical properties.
Automated Sample Preparation for the Analysis of Dioxins and PCBs
LCTech (Germany) presents its Dioxin system DEXTech at Dioxin 2014 that takes place in Madrid from 31st of August to 5th of September. After the sample injection the DEXTech handles the separation and fractionation of dioxins and PCBs from the matrix in a multi-stage process automatically.
In order to make the sample preparation for the Dioxin analysis easier and to reduce the processing time significantly, LCTech GmbH, specialists in automated sample preparation, developed the automated Dioxin system DEXTech in cooperation with CVUA Münster/Germany.
Due to the high level of automation, the system reduces the processing time to only 96 minutes. Depending on the matrix up to 5 g fat can be applied onto the columns.
The small footprint of the stand-alone device enables the parallel use of several systems side by side. This also leads to an immense increase of the throughput and additionally provides the opportunity to handle each method independently at any time.
The electric locking system that clamps the columns tightly also enables an easy replacement of the ready-to-use columns. Due to the optimal fractionating of the analytes in dioxins, ndl-PCBs/mono-ortho PCBs and non-ortho-PCBs, an overlapping of the single analytes during the chromatographic analysis and a resulting wrong evaluation can be avoided from the beginning.
Only a very small quantity of solvents is needed due to a sophisticated and evaluated method. With a duration of 1 minute and a consumption of solvents of 7 mL, the rinsing process also is very efficient and short. Cross-contamination is reliably eliminated.
The handling of the system is done via touch-screen, giving the user the possibility to choose either the default method, usable for all matrices within the range of food and feed, or to create a new method very quickly and easily.
The system consists of high-quality materials and therefore is long-living with very low requirements of maintenance.
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Sensors for the Next Generation
With the new HC801, E+E Elektronik (Australia) presents its smallest humidity sensor for mass applications to date. The miniature sensor for high precision humidity measurement is manufactured in thin layer technology based on silicon and is only 300 x 765 µm in size. Maximum reproducibility of the sensor characteristics and linearity across the entire humidity range, as with all humidity sensors in the HC series, further benefits the sensor element.
The new VTQ is a thin layer flow sensor, combined with the latest transfer molding technology. The result is a compact, easy to assemble
sensor element with high dirt resistance and outstanding reproducibility of the sensor characteristics. Other advantages of the sensor are the rapid response time, low angle dependence and a wider measurement range up to 20 m/s.
The new E+E temperature sensors are suitable for passive temperature measurement, primarily in HVAC and building technology. The product range includes a variety of models, such as a duct or immersion sensor (EE431). Also available are outdoor sensors (EE451), strap-on sensors (EE441), a cable sensor (EE461) or a model with remote probe (EE471).
An innovative production and mounting concept ensures a high protection class (IP65) and permits especially simple and rapid mounting of the sensors.
IET Annual Buyers’ Guide 2014/15
www.envirotech-online.com
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VICI Valco’s (USA) new Universal Valve Actuator permits the use of a single motor and control software to operate virtually any Valco or Cheminert rotary valve, both two position and multiposition. This reduces cost and minimises the amount of equipment necessary to provide adequate valve automation.
All Valco and Cheminert valves and selectors, with their wide range of turning torques, are covered by three actuator versions: high speed, medium speed/medium torque, and high torque. Actuators include a universal 24 volt DC power supply and manual interface. An OEM version that excludes these items is also available. The Universal Actuator is CE/ RoHS compliant and has a variety of interface options including RS232/485, USB, and BCD.
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Now Ionicon takes both concepts one step ahead by seamlessly integrating them into one fast solution. The fastGC add-on provides a quick chemical pre-separation step for Ionicon PTR- TOF systems.
“A fastGC’s spectral run is done in less than one minute! This brings gas chromatographic separation much closer towards real-time analysis and adds another dimension to PTR- TOFMS.”, Ionicon CEO Lukas Märk points out the benefits.
The fastGC module is integrated with the PTR-TOF and the normal sample gas inlet is utilised. This allows researchers to perform real-time measurements and add fastGC runs at time points of interest for enhanced separation and identification.
A recent publication used a prototype of IONICON’s fastGC system to analyse head-space samples of wine. Romano and his co-workers could demonstrate several advantages of fastGC-PTR-TOF. While the high ethanol concentration is separated and no longer impairs the analysis, several isomeric compounds could be resolved, which can be used for an enhanced separation of different wine samples.
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