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Home • TCE
Monitoring System • Groundwater Sampling System • Monitoring
Chloroform • Chromium (VI) Monitoring System • HJ-100 • HJ-300
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About Us
Trichloroethene Optrode Detection System Case Studies
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Chromium (VI) Monitoring System
The
sampling/calibration/analytical system specifically designed for deployment of
sensors in the field is illustrated on Figures 1-4. The system has three primary modules: sampling,
calibration/analytical and support module.
The sampling system is capable of sampling up to five sampling
locations. Sampling location include
industrial piping, groundwater wells, surface water sources and
leachates. Several types of sampling
modules such as groundwater pumps and peristaltic pumps interface directly in
the sampling/analytical platform. The
sampling module is located in the monitoring well and the
calibration/analytical module is located in an auxiliary well located below a
field deployment box. The auxiliary
well located beneath the field deployment allows for protection of the
instrumentation, temperature control, and for ease of maintenance. The support module is mounted on and
inside the field deployment box and includes solar cells, compressor,
controller and communication components. |
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The analytical module is based on the colorimetric detection of hexavalent chromium using 1,5-diphenylcarbazide. The colorimetric analysis is basically an automated version of the USEPA analysis of hexavalent chromium. The system has a limit of detection of 5 ppb of hexavalent chromium in water. The system can perform over 150 analyses before replenishing the solutions. 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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Contact Us
6100
South Maple Avenue • Suite 114 • Tempe, Arizona 85283 •
(480) 968-5141
voice • (480) 345-7555 fax |
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