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| Environmental Technology Listing |
Title of Listing: | | AccuSensor |
Category: | | Characterization Technologies |
Subcategory: | * | Water, All Listings |
Media: | | |
Contaminants: | | |
Web Site: | | http://www.sippican.com/ors.htm |
Email: | | orsenvsys@aol.com |
Technology Description: | |
AccuSensor is a new field-portable instrument from ORS Environmental Systems (ORS) capable of measuring trichlorethylene (TCE) or total trihalomethanes (TMHs) in water. AccuSensor has a rugged and simple design making it very compatible with field use. The analysis is simple and provides for fast, accurate results. This innovative use of technology can mean reduced analysis costs and time.
AccuSensor is comprised of a meter and individually packaged reagent caps. The AccuSensor TCE caps measure the trichloroethylene concentration in water samples with a minimum detection limit of 5 parts-per-billion. The AccuSensor THMs caps measure the total trihalomethanes (THMs) concentration in water samples in equivalent chloroform, with a minimum detection limit of 10 parts-per-billion. The total trihalomethanes measured are the total group of SDWA (Safe Drinking Water Act) trihalomethanes, which equals the sum of chloroform, bromodichloromethane, chlorodibromomethane, and bromoform.
AccuSensor measures the visible light absorbance of products formed in the Fujiwara reaction, in which pyridine and hydroxide ions react with TCE. The reaction is specific for geminal dihalide compounds and ORS has optimized it for response to TCE and THMs in these first two caps.
The optical system consists of an incandescent lamp, a beam splitter, and two photodiodes in the meter. The measurement is made by optically interrogating the reagent reservoir with an incandescent lamp residing in the meter and monitoring the transmitted light with the two photodiodes. The measurement photodiode is filtered to pass a narrow bandwidth centered at the appropriate absorbance maximum while the second photodiode passes non-absorbing frequencies and acts as a reference. The absorbance is measured over a 5 minute period. The rate of formation of absorbing species is directly proportional to the concentration of TCE in the headspace. The headspace concentration of TCE is directly proportional to the aqueous concentration via Henry's Law. The slope of the absorbance versus time plot is thus compared to a calibration curve in the meter and an aqueous concentration is calculated and then displayed on the meter in parts per billion (ppb).
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Performance Status/
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Topics
Analytical Testing, Technologies, Characterization
Additional Topics/Tags/Keywords
ORS, Water, TCE, TMH, Solvents |
Organization: | | ORS Environmental Systems |
Address: | | 7 Barnabas Road
| Phone: | Description | Number |
City: | | Marion | | Toll Free | (800) 228-2310 |
State/Province/Territory: | | MA | 2. | | |
Zip/Postal Code: | | 02738 | 3. | | |
Country: | | United States | 4. | Fax: | (508) 748-3626 |
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