32 Water/Wastewater
New Optical pH Sensing Cuvettes Turn Spectrophotometers into Drift-free pH Meters
Proprietary sol gel coating materials developed by Ocean Optics (The Netherlands) have enabled new technology for convenient, non-intrusive monitoring of biological samples. By encapsulating pH indicator dyes into coatings applied to its new Smart pH Cuvettes, Ocean Optics miniature fibre optic spectrometers and accessories can be used for optical pH sensing of 5.0-9.0 pH range samples. With Smart pH Cuvettes, pH readings can be taken quickly and accurately using existing spectrometer setups, negating the need for a dedicated pH meter. pH measurements are critical in applications ranging from DNA analysis, drug discovery, and blood analysis, to environmental monitoring and food and beverage production.
The Smart pH Cuvettes’ immobilised indicator dye is encapsulated into a robust sol gel matrix, allowing for the diffusion of ions while preventing
leaching of the dye. Unlike traditional pH electrode meters, Smart pH Cuvettes can be used for monitoring low conductivity samples such as boiler water. In addition, fully integrated Smart Cuvette pH systems provide full spectral analysis to help eliminate errors from changes in turbidity, temperature and ionic strength. The physical properties of the immobilised indicator dye eliminate the need for frequent calibration.
Smart pH Cuvettes are 1-cm square, come in plastic Poly (methyl methacrylate) (PMMA) or quartz and are coated on their inner walls with a sol gel embedded with Bromocresol Green pH indicator dye. The cuvettes are available separately (in 8-, 50- and 100-cuvette packs) or as part of a fully integrated desktop or handheld spectrometer-based pH system.
The PMMA Cuvettes have a temperature range of -5°C to 70°C, while quartz is available for high-temperature applications. The PMMA Cuvettes are compatible with aqueous solutions, ethanol/methanol solutions, ammonia, peroxides and sodium hypochlorite solutions. The quartz cuvettes also can be used in acetone and concentrated acids (including nitric, sulphuric and acetic). Although PMMA cuvettes are designed to be disposable, they can be used multiple times depending on sample environments.
Reader Reply Card no 81 New Range of Portable Arsenic Test Kits
The new DigiPAsS and VisuPAsS systems from Palintest (UK) offer accurate, laboratory-standard Arsenic testing in a portable field kit format. Both options use the well-established Gutzeit method to detect Arsenic levels in drinking water, up to and well beyond the WHO recommended maximum of 10 µg/l.
The method first converts all Arsenic in a sample to Arsine gas, which is then completely captured by the unique three-stage filter. This ensures excellent accuracy, with no toxic gas release, over the 20 minute reaction time. The result can be assessed either visually against a colour chart (100 - 500 µg/l) or analysed by the dedicated DigiPAsS instrument with accuracy and precision across the 2-100 µg/l range comparable to AAS. The simplicity of the VisuPAsS system makes it especially suitable for more challenging environments, or where costs must be kept to a minimum.
Arsenic is a naturally occurring contaminant of drinking water in several areas of the world, and even at very low concentrations it causes a variety of serious conditions known collectively as arsenicosis. Symptoms may not even appear until after many accumulated years of drinking contaminated water. The need for accurate testing at low concentrations is therefore vital to continued water safety, and these new Arsenic test kits from Palintest Ltd. offer laboratory quality analysis for on the spot verification.
Measure Fat, Oil and Grease
Levels in Wastewater... on-site results in 10-15 minutes!
AstraNet Systems Ltd (UK) has made new installations of its popular organic water pollution control system. Their on- line spectrometer ensures immediate action can be taken to maintain control of water quality while also protecting valuable plant and equipment.
InfraCal TOG/TPH Analyzers let you quickly and easily:
• analyze produced water on offshore oil platforms
• monitor refinery or industrial plant wastewater effluents
• measure FOG discharge levels into treatment centers
With over 2,000 in operation, InfraCal Analyzers are the worldwide industry standard for on-site measurement of total oil and grease (TOG), total petroleum hydrocarbons (TPH) or Fats, Oils and Grease (FOG) in water.
Don’t wait for off-site lab tests to ensure compliance as fines for discharges above permit requirements can be costly – often more than the price of an InfraCal TOG/TPH Analyzer!
To learn more, visit our web site
www.wilksir.com or call: 203-855-9136 or email:
info@wilksir.com
Naturally occurring and human-influenced pollution incidents can lead to a rapid increase in the organic content of surface waters. AstraNet state that their system, based on the UV absorbance of the water at 254nm, gives a more rapid indication of organic pollution than other methods that were primarily developed for laboratory analyses. With no moving parts and a rugged and durable
optical system AstraNet also claim that their installations require little maintenance and have been proven as intake protection devices in many locations around the UK; including installations in all the treatment plants around Lough Neagh in Northern Ireland, the largest fresh water lake in Great Britain.
As well as the organics indicated at 254nm the AstraNet system outputs the absorbance at up to three other wavelengths enabling background colour and turbidity to be monitored as well. Enhanced sensitivity is offered by the long path length flow cell that has windows which are easily de-mounted for cleaning. The fibre optic link from the flow cell to the instrument enables flexibility in location and ease of access to all parts of the system.
Stand alone logging or control through SCADA/PLC systems is supported, following a simple set-up of sampling rate and wavelengths continuous, unattended operation can be instigated.
Reader Reply Card no 83 Reader Reply Card no 82 On-Line Organic Pollution Control
Take a look at our website
www.envirotech-online.com
Reader Reply Card no 84
IET
May/June 2010
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