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| Environmental Technology Listing |
Title of Listing: | | ChemSensor |
Category: | | Characterization Technologies |
Subcategory: | * | Waste, All Listings |
Media: | | Groundwater |
Contaminants: | | Halogenated and Non-Halogenated Volatiles and Semivolatiles, Petroleum Hydrocarbons, BTEX, Solvents |
Web Site: | | http://www.sippican.com/ors.htm |
Email: | | orsenvsys@aol.com |
Technology Description: | |
ChemSensor is ORS Environmental System's new instrument for in-situ, real-time detection of volatile organic compounds (VOCs) in water. Its rugged, field-portable design provides fast, repeatable, low-cost analysis. ChemSensor consists of a probe connected to a meter via a Teflon cable that enables in-situ sampling to depths of 100 feet. The response of the probe to organics is dependent upon the quantity and mixture of analyte(s) in the sample. The response is measured and converted to the equivalent p-xylene response in parts-per-million (ppm). The device is capable of measuring responses greater than 1 ppm equivalent p-xylene.
The sensing element of the ChemSensor probe is an unclad quartz optical fiber core that has been coated with a hydrophobic/organophyllic chemical coating. This coating absorbs organics while repelling water. Light is launched into the fiber from a light emitting diode (LED) and detected at the opposite end by a photodiode. A reference detector is used to ensure stability. The amount of light that is transmitted to the detector is dependent upon the difference between the refractive index of the optical fiber core and the chemical coating. When the probe is immersed into water containing VOCs, the VOCs will partition into the organophyllic coating and change the effective refractive index of the coating. This will result in a change in the amount of light transmitted to the detector. The resultant loss of light reaching the detector correlates to the concentration of VOCs present.
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Performance Status/
Limitations: | |
Performance Status:
ChemSensor has been successfully used by Major Oil companies and their consultants to significantly reduce the cost of monitoring for BTEX (benzene, toluene, ethylbenzene, and xylene) and TPH (total petroleum hydrocarbons) at leaking underground storage tank sites.
Limitation:
ChemSensor is designed to detect total organic compounds, especially volatile organics. For this reason ChemSensor responds to many different organic chemicals in water and thus provides no information on the individual components in the mixture of contaminants.
Temperature affects the response of the probe, thus requiring a temperature measurement for compensation of the response. The response of the probe to organic-free water increases linearly as the temperature is decreased. Larger errors due to temperature can be expected as the difference between the sample and zero water temperature increases. A temperature coefficient is established at the factory that corrects the response to minimize the effect of measurements made at dissimilar temperatures.
The ChemSensor probe must be re-zeroed between measurements. Therefore additional hardware will be required for continuous monitoring with ChemSensor.
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Topics
Analytical Testing, Technologies, Characterization
Additional Topics/Tags/Keywords
Sensors, VOCs, In-situ, Monitors |
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 |
Branch Locations: | |
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