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Chloroform • Chromium (VI) Monitoring System • HJ-100 • HJ-300
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Trichloroethene Optrode Detection System Case Studies
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HJ-100TCE MONITORING SYSTEM
The sampling, support and communication modules of the TCE monitoring system are similar to the hexavalent chromium monitoring system. The primary difference is the “plug and play” analytical module. A TCE monitoring system deployed in a climate-controlled industrial setting is illustrated on Figures 5-6. The TCE monitoring system may be deployed in a field system similar to the chromium system illustrated on Figure 7. The system can sample up to five different sampling locations. |
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The “plug and play” TCE analytical module is a direct replacement of the hexavalent chromium module. The TCE analytical module uses a TCE-specific optrode. The optrode is fabricated from a permeable fluorocarbon tube suspended in the headspace of the sample. The interior of the fluorocarbon tube is filled with a Fujiwara reagent. The Fujiwara reagent in the permeable fluorocarbon tube reacts with the TCE in the headspace. The reaction of the colorless reagent with TCE produces light-absorbing (red) products. The operation basis of the optrode is the measurement of the time history of the development of a colored product formed by the TCE with the reagent. The analytical module has a limit of detection of 1 ppb TCE in water. The system has sufficient reagent to perform over 250 analyses before replenishment of the reagent.
The system is capable of automatically performing creation of blanks and calibration curves. The quality control checks performed by the system include: spikes, duplicates and final mid-point calibration checks to ascertain the performance of the data produced by the system.
The solar cells are used to power (12 volts) the unit and create the air pressure using a 12-volt compressor. The system is controlled by a laptop computer running a Visual Basic program. In remote monitoring applications a radio frequency modem is used (Data-Linc) to communicate with the monitoring system in the field and the user at a remote location. In summary, the sampling/calibration/analytical system has the following capabilities: Sampling: five sampling points Analytical: 5 ppb detection limit Automatic calibration: three step standards Quality Control: spikes, splits, mid-point standards Power: solar cells and batteries Communication: Radio frequency modems for remote computer control |
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South Maple Avenue • Suite 114 • Tempe, Arizona 85283 •
(480) 968-5141
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