Environmental Analysis 53 Zetasizer Nano Delivers Essential Data in Environmental Nanosafety Work in Canada
Researchers at the University of Alberta, Canada, working as part of a major Canadian initiative to investigate the aquatic and environmental aspects of nanoparticles, are using the Zetasizer Nano from Malvern Instruments (UK) to characterise nanoparticle behaviour in biological and aqueous matrices. Size is known to affect nanoparticle toxicity and toxicology and the technique of dynamic light scattering (DLS) provides the average size behavior in solution. As implemented in the Zetasizer Nano, it delivers information for physical characterisation in terms of charge and solubility.
Professor Greg Goss is Director of the Office of Environmental Nano Safety (OENS) in the Department of Biological Sciences at the University of Alberta. “Dynamic light scattering is now recognised as a basic characterisation technique in this area of work and the regulators are familiar with the measurement, its results and limitations. In the past we’ve used TEM but this works better in conjunction with DLS since we can now study size in solution in a way that is simple to use and with only minimal need for sample preparation,” he said. “DLS is the only technique on campus that can provide size information in solution, without drying the samples.”
Professor Goss and his team have previously used earlier models of DLS instruments but find that, compared with other systems, the Zetasizer Nano delivers information that is not only much easier to understand and is more consistent, but enables significantly more data interpretation: “We can now study interactions of proteins in ways that previously were not feasible,” he confirmed.
The Zetasizer Nano is used by this research group to study the interactions of particles such as silver, titanium, silica and polymer coated quantum dots. Elsewhere in the department it also plays a role in the analysis of other systems, micelles and polymers for example.
Malvern’s Zetasizer range combines particle size, zeta potential and molecular weight analysis for particles and molecules from below a nanometer in size to several microns. The system measures size using dynamic light scattering, zeta potential and electrophoretic mobility using electrophoretic light scattering, and molecular weight using static light scattering.
Reader Reply Card No. New Flowmeter for Compressed Air and Gases
Only with precise knowledge of compressed air and process gas costs can saving potential be understood. The new thermal flowmeters from E+E Elektronik (Austria) record the mass flow or corrected volume flow in your supply network with the highest possible precision, regardless of pressure or temperature. For example, consumption of compressed air, nitrogen, helium, CO2 or oxygen can be measured.
The EE771, EE772 and EE776 flowmeters enable extremely precise evaluation throughout the pipe network from the compressor through to the end consumer. Even the smallest volume flows are recorded accurately, which is a prerequisite for charging consumers exactly or locating leaks. Measurements can be carried out in pipes of DN15 (1/2“) to DN300 (12“) and with an operating pressure of 16 or 40 bar.
During development, special attention was paid to simple, cost-effective and, above all, safe assembly of the flowmeters. In this respect, the patented non-return protection device of the EE776 sets new standards for safety. The hot tap valve of the EE772 and the ball valve mounting fitting of the EE771 ensure that the flowmeters can be installed and removed very quickly in their operational state. This is a useful feature for periodic quality control and calibration. For pipes from DN40 (1 ½“) this can even be done without interrupting the flow in the supply pipeline.
It is easy for the customer to adapt the flowmeter perfectly to its measurement task using the configuration software included in the delivery.
Two signal outputs are available to output the measured values. Depending on the application, these can be configured as an analogue output (current or voltage), switching output or pulse output for consumption measuring. The flowmeters are also optionally available with an integrated bus output, M-bus or Modbus RTU.
Reader Reply Card No. 247 246
RO Design Type Program Significantly Expanded
To manufacture the worldwide best miniature pumps for medicine, analysis and laboratory technology - this is the aim of Schwarzer Precision (Germany). Based on this aspect, our rotation diaphragm pumps (RO design type) have been subjected to a stringent revision during the past months. The new RO generation offers a greater type variety than ever before – with their performance improved even more.
Rotation diaphragm pumps (or rolling pumps) are marked by especially low-pulsation delivery. Contrary to eccentric diaphragm pumps rotation pumps are equipped with several small diaphragms actuated sequentially. Thus a very continuous volume flow, nearly linear pressure characteristic curve and running characteristics almost free from pulsation and vibration are achieved.
The SP 30 RO rotation pump is now also available as vacuum pump. The type SP 30 RO-V generates a vacuum of 640 mbar at a free flow of 3.7 l/min. Dimensions and weight are identical with the pressure version SP 30 RO-DV.
The modular types SP 16 RO-DV and SP 18 RO-D are now available in additional motorisation versions. Our customers can choose between particularly compact dimensions (short motor) or especially low current consumption (longer motor). The direction of the hose connection necks is also freely configurable.
The SP 27 RO-D rotation pumps have received optimised diaphragms and higher quality bearings. Thus they now reach pressures up to 1000 mbar. The performance of the also available vacuum version SP 27 RO-VD could be increased to -600 mbar.
Schwarzer Precision therefore now offers the worldwide largest product range of maximum quality miniature rotation pumps.
Reader Reply Card No. 248
Oil in Water/ Soil Analyzers
• Oil & Gas Produced Water
• FRAC Water
• Fats, Oil & Grease in Wastewater
• Wastewater Treatment Centers
• Soil Remediation Sites
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Reader Reply Card No. 249
Reader Reply Card No. 250
www.envirotech-online.com IET September / October 2012
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