42 Elimination of Charge in Difficult Cases
Using PTFE vessels (or other strong electrical insulators) When using materials with a very strong electrical insulation effect, additional measures may be required. A grounding strap between the spatula and grounded surface may be helpful. Sometimes even simply wrapping the container with uncoated aluminium foil can help to eliminate the disruptive static effects. If this doesn’t work, a multi-electrode high- voltage ioniser, should be used. Keeping the sample within the electrode area for longer may also help to ensure discharge (i.e. up to 20 seconds).
Working with dry powders
Problems similar to those with tare containers also occur with test substances. Powdery substances that have just been dried in plastic containers can easily be charged, and exhibit the typical jumping from spatula onto other surfaces phenomenon. In this situation, passing the spatula loaded with sample in front of a high-voltage ioniser has proved to be effective. Powdered samples on the insides of bottlenecks or vessel openings can be prevented from jumping by increasing the time the vessel spends in the vicinity of the ioniser electrode.
Summary
Balance users need to aware of the causes and effects of electrostatic charges in relation to weighing. Wherever possible, preventative action should be taken to reduce or eliminate the build-up of static charges, in order to avoid any errors or delays in the weighing results. Various tips and recommendations are provided on how to reduce the effects of static in a weighing environment. In addition, established solutions for deionisation of the weighing vessel or sample are described and compared. The ability to automatically detect and eliminate the presence of electrostatic charges during a weighing process.
Further Reading
Weighing the Right Way Guide, Proper Weighing with Laboratory Balances, METTLER TOLEDO, Doc. No. 720906, January 2015,
www.mt.com/weighing-guide Reichmuth A et al.; The Uncertainty of Weighing Data Obtained with Electronic Analytical Balances. Microchimica Acta 148, 133–141 (2004) DOI 10.1007/s00604-004-0278-3
Reichmuth A (2001); Weighing accuracy with laboratory balances. Proc 4th Biennial Conf. Metrol. Soc. Australia, Broadbeach (QLD, AU), p 38 Reichmuth A, Mettler Toledo; Einflüsse und deren Vermeidung beim Wägen Reichmuth A, Mettler Toledo; Weighing small samples on laboratory balances
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www.labmate-online.com/article New Water Bath Series Features Compact Design and Ease of Use
Memmert presents one of its classics with modern comfort features and a contemporary design: the new WTB water bath is light, compact, user-friendly and modularly expandable.
“Our new WTB water bath is compact and comfort class in one,” explained Philipp Schwarm, Managing Director and Head of Development at Memmert. Heating and control technology as well as design have been developed from scratch, so that the compact, lightweight appliances can fit into any laboratory. The guiding design principle, however, was maximum operating convenience.
The central eye-catcher on the unmistakable structured stainless steel housing is the personisable remote view CustomView of the touchscreen. From every corner of the laboratory, users always have an overview of the essential parameters. The stainless steel tray has rounded corners and a drain valve as standard. The bath can be completely emptied and thoroughly cleaned without tilting. For special applications, a circulation pump, shaking device, test tube holder or insert racks can be expanded at any time. The Memmert water bath is available with an interior volume between 7 and 51 litres and has a temperature setting range from 5? above room temperature to 100?. With a Peltier cooling device, the medium can be cooled down to +10?.
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ilmt.co/PL/6r0q 53905pr@reply-direct.com New CE-Marked COVID-19, Flu A/B, RSV Combo Kit Released
Thermo Fisher Scientific announces CE-marking of its TaqPath COVID-19, Flu A/B, RSV Combo Kit for the in vitro diagnosis of SARS-CoV-2, influenza A/B and respiratory syncytial virus (RSV) A/B infections. Using the new kit, laboratories can now can run a single test for SARS-CoV-2, influenza (flu) A/B, and RSV to detect and differentiate between diseases that share similar clinical symptoms, and get the information needed to help diagnose and monitor the spread of these respiratory illnesses in approximately three hours.
“We knew that this season’s surge in COVID-19 infections could coincide with cases of influenza and RSV, so we worked quickly to develop a PCR-based diagnostic kit for detecting and differentiating these illnesses simultaneously,” said Mark Smedley, President of Genetic Sciences for Thermo Fisher. “Our new kit provides laboratories with the ability to diagnose and monitor the spread of COVID-19 and similar illnesses, which may require different patient management, including quarantining measures.”
The TaqPath COVID-19, Flu A/B, RSV Combo Kit enables laboratories expand their existing COVID-19 testing menu for respiratory samples while maintaining low operational costs and workflow simplicity. The device includes Applied Biosystems Pathogen Interpretive Software to automatically convert genetic analysis data into a readable report, helping reduce risk of user interpretation error.
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Flexible Device for Screening Chemical Reactions Under High Pressure
The Multicell PLUS is an exciting addition to the Asynt range of pressure reactors, offering scientists an extremely flexible and customisable device for screening chemical reactions under high pressure conditions.
With its own unique safety-locking mechanism and robust, adjustable support frame / lifting platform option, the Multicell PLUS high-pressure reactor sets a new benchmark for operator safety, all-round accessibility and ease-of-use.
Dr Mike Kenny of Asynt commented: “The Multicell PLUS boasts an almost endless number of design combinations that gives the user complete flexibility when it comes to running parallel high-pressure reactions. As a chemist I really appreciate how the new Multicell PLUS allows you to set up different experimental options on each of the systems 8 reaction cells. Drawing upon the extensive capabilities of our UK manufacturing facility, and the expertise of our technical team, we are able to specify and custom-manufacture every Multicell PLUS so that it exactly meets the needs of each customer.”
Manufactured from 316 stainless steel, the Multicell PLUS standard unit operates up to 50 barg and temperatures up to 200ºC. For more demanding chemistries Asynt offers options for the system to be manufactured from alternative materials which are able to withstand highly corrosive / caustic chemicals, and for increased operational conditions up to 200 barg and temperatures in excess of 300ºC. While the Multicell PLUS accommodates 8 x 30 mL cells as standard, options are offered for 4-, 6-, and 10-cell arrangements with individual cell volumes up to 100 mL. Motor-driven magnetically coupled overhead stirring is also offered as an option for more viscous reaction mixtures. The entry-level Multicell PLUS permits a common gas inlet supply allowing for a single gas inlet and connection to all vessels. Optional independent isolation of each cell offers ability to charge each vessel with a differing chemistry and pressures without cross contamination between cells. Users can choose from a range of options available for heating and cooling reactions on the Multicell PLUS.
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INTERNATIONAL LABMATE - FEBRUARY 2021
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