Environmental Analysis & Electrochemistry


Redesigned Oxygen Gas Analyser Provides Accuracy and Versatility


The Rapidox 1100 oxygen gas analyser continues to be the company’s best-selling and versatile instrument due to its accurate and reliable service for over 15 years. Cambridge Sensotec is proud to announce a new design for the gas analyser with exciting enhancements.


A new OLED (organic light-emitting diode) screen now delivers improved visibility from every angle with four lines of information displayed. The Rapidox 1100 is easy to identify in laboratories, manufacturing plants or test facilities due to its new dynamic blue fascia design.


Additionally, for low ppm oxygen gas measurements, the Rapidox 1100Z models now include an updated zirconia planar sensor; providing a more effective sensor heater design, faster response time and superior service life.


An internal pressure sensor compensates for small changes in gas pressure to ensure that the readings remain stable. A powerful long-life pump draws in a gas sample at a flow rate set by the user between 0-1 litres per minute.


The Rapidox 1100 range are available in many variations including a choice of two electrochemical oxygen sensors, one for low ppm measurements of 1ppm to 1% and another for 1–100% oxygen range. Electrochemical sensors are ideal for applications where VOC’s or flammable gases are present in the gas sample.


Other variations of the model include a three-channel multiplex version, which allows for three gas streams to be sampled from separate points. Gases can be analysed in sequence or at intervals set from the controls (front keypad or software). The Rapidox 1100 oxygen gas analyser can also be used to control an external proportional flow control valve (PFC). This is particularly useful within inert gas blanketing applications, where the analyser can regulate the level of gas based on the measurement of oxygen via the PFC control function.


Standard features on all models include two fully programmable alarm circuits (volt free contacts), programmable analogue outputs (0-10V and 4-20mA), easy calibration (user selectable gases), RS232 / RS485 communications and complete data-logging software.


The Rapidox 1100 oxygen gas analyser range is well suited to a wide range of applications within research and development, laboratories, medical and food packaging testing. 39765pr@reply-direct.com New Portable pH Meters Launched


Bibby Scientific Ltd have announced that Jenway®, a leading UK manufacturer of analytical laboratory instruments, has launched two new portable pH meters, models 550 and 570. These new pH meters can be used in the field to perform accurate measurements, removing the need to take samples back to the laboratory. This is essential for scientists working out in the field, to achieve results.


Jenway’s new portable pH meters have been designed to readily withstand a diverse range of environments, whilst accurately and reliably measuring pH levels for a variety of sample types.


Model 550 is a general-purpose portable pH meter that displays both the temperature-compensated pH readings and temperature. This small, lightweight meter has an LCD display packaged in a splash-proof housing and has 5,000 hours of battery life.


Model 570 is a general-purpose hand-held pH, mV and temperature meter. The unit displays either temperature-compensated pH readings or electrode potential and temperature readings. This model features a large, easy-to-read LCD display and has an integrated rubber seal to ensure that the unit is completely waterproof.


Both models offer 2-point pH calibration and automatic buffer recognition, and come with a market-leading 2-year warranty.


“Bibby Scientific is committed to providing reliable and high quality products, and these new portable pH meters will complement Jenway’s comprehensive range of application-specific electrodes and consumables,” said Becky Underwood, Product Manager at Bibby Scientific. For more information on the new portable pH meters please visit www.jenway.com/product.asp?dsl=9113


39145pr@reply-direct.com


Bacteria Presents a New Challenge for Planetary Mills


Sewage sludge is for most people an unpleasant by-product of civilisation and is considered worthless, problematic waste. Not so for several researchers. In the professional world it is well-known that besides many inorganic substances, also many bacteria are contained in sewage sludge and that these bacteria contain protein. With increasing significance of closed substance cycle waste management, the scientific focus is also on such substances. Examined was so called excess sludge of biological sewage treatment. Bacteria are contained foremost in this sludge.


Now bacteria are not just bacteria. The professional world divides them into several groups, which for example are differentiated according to their behaviour during the so called Gram stain. They have in common though, that they protect their substances with a more or less solid cellular wall. Particularly the most common bacteria in sewage sludge have an especially solid cellular wall. At the University of Applied Sciences in Merseburg, Germany, for the thesis of Mr Michael Herrmann, the destruction of cellular walls was examined under the guidance of Professor Dr Winkler, University of Applied Sciences, Merseburg and Dr Schaffer, IVG mbh Schkopau. As a dimension for the decomposition, the recovery index was designated. For this, the protein concentration during the solid phase was determined prior as a reference value. Different decomposition methods were examined in the laboratory.


Mechanical decomposition methods to be mentioned: Planetary Mono Mill PULVERISETTE 6 classic line, Fritsch Milling and Sizing; Ultrasonic Homogenizer SONOREX RK 1028 CH, Bandelin electronic GmbH; Homogenizer ULTRA-TURRAX T25, IKA Laboratory Equipment.


Acid hydrolysis was utilised as the chemical procedure. For the characterisation of the effectiveness of the decomposition a protein assay was conducted.


In the planetary mill, dry matter contents of approximately 10, 20 and 40 g/l were examined. As a grinding medium glass pearls of 0.4 to 0.6 mm diameter were utilised. The volume amount of the grinding medium was matched 1.1 to the liquid volume. Treatment times of 2, 5 and 10 minutes were examined. In principle it was established that with increasing processing duration and a decreasing of the dry matter contents, the recovery index rises. The comparative observation of the decomposition methods reveals that samples processed with the Planetary Mono Mill PULVERISETTE 6 classic line have the highest recovery index.


40570pr@reply-direct.com


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44