Our online Water Guide can help you find the products and information you need to get the job done. Click here.
Featured Products:
Aqua Scope II™ Viewing Scope 26" scope is great for Secchi disk readings. More information here.
EXTECH® Chlorine Meter Portable meter measures chlorine concentration. More information here.
Accuracy Matters
Many chemical and biological reactions in groundwater depend directly or indirectly on the amount of available oxygen. Dissolved oxygen (DO) may be monitored in groundwater samples to examine the water quality. A change in DO value can indicate pollution by microbiological contaminants, organic matter or reduced mineral phases.
The Thermo Scientific Orion rugged dissolved oxygen (RDO) sensor can be used in the field to measure for oxygen content directly in the sample of interest. This sensor has shown similar readings to the polarographic sensor in groundwater samples taken from wells at depths of 10 to 30 ft and water temperatures from 13°C to 16°C in Cape Cod, Mass.
Many wells had low DO concentrations of less than 1 mg/L—concentrations that are typically challenging for polarographic DO probes; however, the sensor is quick to respond in low-level oxygen solutions.
In a solution with little or no oxygen, the Orion RDO sensor response is equivalent in speed to the polarographic DO probe, but it shows good accuracy as it stabilizes at zero. These measurements were made after a calibration in water-saturated air, indicating that a zero calibration point is not required for accurate low-level measurements with the sensor.
Technology Overview The RDO sensor simplifies DO measurements. The RDO cap, with a lifetime of one year, replaces the membranes and electrolytes necessary for polarographic DO probes that require frequent maintenance. The sensor utilizes luminescence technology to detect oxygen, in which the signal response is inversely related to the oxygen content, resulting in improved accuracy in low-level samples.
The stainless steel sensor guard protects the RDO cap and provides weight to the sensor, allowing for measurements at any depth. The sensor does not consume oxygen, so sample stirring is unnecessary, and a calibration sleeve is available, making in-situ field measurements easy and accurate.
You can try Thermo Scientific Orion Star RDO meter and probe risk free for 30 days when you take advantage of our limited time offer. Check it out here.
Originally published in Waste Water Digest.
EPA Budget Expanded this Year
The EPA budget is growing by almost $3 billion dollars for 2010. The bulk of this expansion is a direct result of the 2009 American Recovery and Reinvestment Act. These dollars are designated to improve infrastructure (water treatment), clean up efforts either through Brownfields (clean up of contaminated oil/petroleum sites) or Super Fund site. There is also a large $600 million increase for enforcement as well as increases for efforts to secure our water supplies against terrorists and other disasters.
Other changes that would be of interest to water quality professionals include:
You can find an overview of the entire EPA budget on the agency's Web site here.
Product Spotlight
Thermo Scientific Orion Optical Dissolved Oxygen Meters
Now’s the time to try one of the easiest to use and maintain dissolved oxygen meters ever created! For a limited time you can try a Thermo Scientific Orion Star RDO meter and probe for 30 days RISK FREE! Get the details here!
Did You Know?
An average person in the U.S. uses 80 to 100 gallons of water a day. In the middle ages (5th through 15th centuries) average water use was only five gallons each day.
Spout Off! Your Chance to Win!
Last Issue’s Winner:
Last Issue we asked once you purchase Ben’s Shipping Deal, how long will you receive FREE shipping from Ben Meadows? Josh from Westport, CT knew you get free, ground shipping for 365 days when you get in on the deal.
We’ll be sending him a Leatherman P4 Squirt Multitool.
This Issue's Question:
For what would you use Imhoff cones?
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This month's prize: Leatherman Squirt P4 Multitool
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