30 Environmental Analysis
Reporting Ultra Low Mercury Concentrations in Environmental Samples
India’s National Institute of Nutrition Buys Rapid Separation Liquid Chromatography Systems for Food Characterisation
Dionex (USA) is pleased to announce that India’s National Institute of Nutrition, located in Hyderabad, India, has purchased 8 Dionex Rapid Separation Liquid Chromatography (RSLC) systems for the analysis of amino acids and carotenoids in food derived from different regions of India.
3000 RSLC system (
www.dionex.com/RSLC) provides fast, high-resolution LC separations using high flow rates for increased throughput. Its unique combination of extensive pressure range, high flow rates, and fast data collection facilitates high peak capacity in the shortest run times. The system is ideal for high speed and high resolution chromatography.
The UltiMate®
The National Institute of Nutrition is the Government of India’s premier nutrition research institute with the mission to provide dedicated research that will enable food and nutrition security as described in the nutrition goals set by the Government of India.
Reader Reply Card no 85 Environmental Monitoring in Landfill
The Millennium Merlin (liquid) and Sir Galahad (gaseous) from PS Analytical (UK) provide industry leading performance for fundamental sensitivity when measuring the mercury concentration in a wide variety of matrices.
The Millennium Merlin instrument is capable of measuring concentrations of mercury down to 0.1 ng/l (sub ppt) levels in liquid samples and the Sir Galahad has a detection limit below 0.1 ng/m3. However, it is important to realise that the instruments also have a wide linear dynamic range and are capable of accurate and reliable measurement of mercury over 7 orders of magnitude. This allows liquid samples to be analysed in the mg/l or ppm range and gaseous samples up to the µg/m3 range without dilution.
A further benefit in using atomic fluorescence as the detection mode for mercury analysis is that it is highly specific for mercury detection and there are no known interferences in this analytical technique. The systems are easy to use and have proven over more than 25 years that they are rugged and reliable in operation – allowing a mercury result to be provided in under 2 minutes.
As well as providing laboratory instrumentation, P S Analytical offer both liquid and gaseous system for continuous on-line operation to meet accepted international safety standards. Many of these systems have been running unattended on a 24/7 basis throughout the world.
Atomic fluorescence is widely accepted by legislative bodies as the technique of choice for mercury analysis in a range of matrices from oil and gas to potable water.
Reader Reply Card no 86 New Humidity Sensor
Sensirion (Switzerland’s) new SHT21 humidity and temperature sensor has now been qualified in accordance with the AEC-Q100 automotive standard. This confirms the outstanding reliability,
stability and robustness of the sensor, which has been in regular production since April 2010.
During the qualification process, the SHT21 was put through the relevant series of tests. Its aging resistance was
confirmed by the High Temperature Operating Lifetime (HTOL) test, and its stress resistance was demonstrated by the Unbiased Highly Accelerated Stress Test (UHST). Furthermore, a Temperature Cycling (TC) test confirmed the compatibility of the packaging material with the chip and substrate, and the Electrostatic Discharge (ESD) and Electromagnetic Compatibility (EMC) tests proved the robustness of the sensor with regard to these parameters.
The SHT21 humidity sensor passed all the tests without any permanent changes to its characteristics and therefore fulfilled the quality requirements of the AEC-Q100 automotive standard. This qualification, along with the reliability, stability and robustness it certifies, allows users to employ the SHT21 with confidence and the assurance of proper, trouble-free operation.
Reader Reply Card no 88
Web-based Selector Tool for ICP Instrumentation
Teledyne Leeman Labs (USA) announces a web-based selector tool for ICP instrumentation.
Are you puzzled by which ICP is right for your application? No need
to be. Teledyne Leeman Labs helps you find the best instrument configuration for your sample type. Visit their website to use the New ICP Selector at
http://www.leemanlabs.com/ICP_Selector/
icp.aspx. Just answer a few questions and find out which ICP configuration (e.g., axial, radial, dual view, array detector, or PMT) is the perfect fit.
Reader Reply Card no 90 Reader Reply Card no 89
The impact of landfills on the local population convinced Pollution S.r.l. (Italy) to develop an analytical system for environmental pollution. Currently, surveys for environmental analysis are carried out discontinuously, air samples are taken at regular time intervals and canisters are analysed in the laboratory: the absence of continuous monitoring and the delayed response does not allow real time action and tracking of the pollutants.
To better identify substances released from landfill, a preventive screening was performed using a portable Gas chromatography-mass spectrometry (GC-MS) system. The HAPSITE GC-MS system provides insights on the analysis of volatile organic compounds (VOCs) in environmental hazardous waste treatment and industrial hygiene. On-site critical information can be achieved in a fast and reliable way.
The process of continuous monitoring was then performed using a portable micro gas-chromatographer "Vega- CG" and a multipoint sampler "Vega-MPS" produced and distributed by Pollution S.r.l..
Vega MPS has the function to send in sequence to the VEGA-GC the samples “sucked” at different points inside or on the neighbourhood of the landfill. This system consists in a network of pipes of inert material (PTFE) and the intake air is continuously pumped in each line to ensure fresh and not diluted samples. Between sampler and analyser a concentrator EDU-3 from Airsense Analytics (Germany) has been placed to increase the sensitivity of the monitoring system. Also the concentrator is directly controlled by the Vega-GC.
Using the MC-Plan Software integrated in the computer of the Vega-GC, it is possible to record the chemical composition of the sampling point at a specific sampling time and to compare the concentration of each component with the TLV level (the threshold limit value). If the threshold level is exceeded on one or several points, an alert message is sent by email or to the mobile phone of the operator of the landfill. It is also possible to connect to the Vega-GC through a remote PC to graphically display the concentration trend during the last hour in order to perform a deep analysis.
Reader Reply Card no 87
AET August/September 2010
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