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USGS Study on Nitrate Sensors: Effect of Suspended Sediment and Color

PhotoThe U. S. Geological Survey conducted a study of four commercially available ultraviolet spectrophotometric nitrate sensors to determine the effects of suspended sediment concentration (SSC) and colored dissolved organic matter (CDOM) on sensor accuracy. Released this spring, the report reviews the Hach NITRATAX plus sc (5mm path length), Hach NITRATAX plus sc (2mm), S::CAN Spectro::lyser (5mm), and Satlantic SUNA V2 (5mm).

Of the four sensors tested, the Satlantic SUNA V2's accuracy was affected the least in the CDOM test. The Hach 5mm, Hach 2mm, and SUNA V2 met their respective manufacturer accuracy specifications up to concentrations of 4,500 milligrams per liter (mg/L) SSC. The S::CAN failed to meet its accuracy specifications when the SSC concentrations exceeded 4,000 mg/L.

Results of this evaluation indicate that although suspended sediment and CDOM interfere with all of the UV spectrophotometric nitrate sensors, the sensors are more effective compensating for suspended sediment and less effective compensating for CDOM. These results suggest that the end user of these sensors should be aware of the potential skewing of the data due to these interferences, especially if the site is one that has highly colored (chromophoric) water. Read the full report here [PDF].

 

HydroCycle-PO4 Phosphate Sensor: Wet Chemistry Engineered for Environmental Monitoring

PhotoSea-Bird Coastal's HydroCycle-PO4, with its advanced fluidics, stabilizes rapidly and gives accurate results once deployed without excessive priming. Its autonomous operations, low-power, and five-month reagent stability enable extended deployments in remote locations.

Data Reliability: The HydroCycle-PO4 filter was engineered to improve efficiency and limit clogging during sediment events.

Data Quality: Advanced fluidics, which are resistant to bubbles that plague wet chemical sensors, enable the HydroCycle-PO4 to make measurements at high oxygen saturation and greatly improves sensor uptime in these environments. Now users can expect greater than 90% uptime in bubble-rich conditions!

Data Quality Control: Spend less time analyzing data quality and more time analyzing what the data means. The HydroCycle-PO4 includes real-time quality-control flags that can be output via SDI-12 and RS-232. Additional quality-control analytics and statistics are available through the post-processing features in the software.

 

UPCOMING EVENTS

Oceans 2016
Monterey, CA, USA
September 19 - 23, 2016

Ocean Optics 2016
Victoria, BC, Canada
October 23 - 28, 2016

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Tech Tip: Sea-Bird Electronics (SBE) Online RMA & Service Request Form

Tech Tip

Do you need to have an instrument recalibrated or repaired? Do you like to work in the middle of the night, or are you in a vastly different time zone than our U.S. factory in Bellevue, Washington? SBE's online RMA form allows you to get all the ‘paperwork' done quickly whenever it is convenient for YOU, without the need to call or email. Just fill in the requested information, and the form will provide the RMA number for you to include with your instrument shipment. Check out the form here

 

Meet Our People

Scott Feener
Senior Project Engineer

Photo

Scott graduated from the Faculty of Engineering at Dalhousie University 1997 with a Bachelor of Engineering degree (Electrical). After finishing his degree, Scott joined our Halifax location (Satlantic) as an Engineer-In-Training (EIT), with later positions as a Systems Engineer and Project Engineer leading to his current role as a Senior Project Engineer. Scott obtained his Professional Engineer designation in 2002.

Scott works within the Systems Engineering group, focusing on development and support of large systems as well as RoHS (Restriction of Hazardous Substances) compliance. Scott had a myriad of key and lead roles in the development and support of SUNA, SeaFET, ISUS, STOR-X, LOBO, HyperOCR, PAR, Solar Tracker, OCR-500, MicroPro, Profiler-II, and BioShutter series of instruments. He has made numberous support visits over the years, including on-site support for the technology transfer from MBARI for the ISUS, and working with NASA in the Bahamas in the initial development of the Micro Pro (precursor to the Profiler II).

Scott has been married to his wife Dawn for nearly 20 years. He is the proud father of two very active young daughters, Jessalyn and Madison, and fills his spare time keeping them active and amused.

 
   

 

Sea-Bird Scientific / Sea-Bird Electronics / WET Labs / Satlantic

 
     
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