.: Trihalomethanes (THM) Monitoring System


  • Analytical Methodology:  Colorimetric Optrode
  • Limit of Detection:  5 ppb
  • Number of Sampling Ports:  Four
  • Sampling Frequency:  Every 20 to 30 Minutes
  • Quality Control Checks:  Duplicates, Spiked Samples
  • Method of Calibration:  Calibration Curve, Automated
  • Process Control Option:  Yes
  • Communication Option:  Wireless Communication
  • Power Requirements:  110-volts, or 12-volts
  • Dimensions: length:  31 ¼”, height: 21 ¾”, width: 6 ¾” (Industrial Deployment)
  • Other Requirements:  Source of Compressed Air (2 to 4 psi)
  • Secondary parameters capable of measurement
    • Conductivity
    • pH
    • ORP
    • ion-specific electrodes
    • water pressure
    • water level (well levels)
    • temperature

The THM monitoring system uses a Colorimetric Optrode.  The optrode is suspended in the headspace above the water sample. THM present in the headspace diffuses through the permeable walls of the optrode and reacts with the colorimetric reagent (modified Fujiwara reagent) contained within the optrode.  The reaction creates colored products that are detected by the optrode. PRESS ME

The wall-mounted system was designed to continuously monitor industrial, municipal and natural waters from up to four sampling ports.  The system is ideal for monitoring the influent and effluent waters of treatment plants, or at points of compliance within a treatment plant.  The software of the system allows the user to set the operating conditions for sampling ports to be selected, sampling frequency and when to calibrate and perform quality control checks (duplicates, matrix spikes).  The system is fully automated with all calibration and quality control checks prepared and analyzed by the system.  The data generated from the monitoring system is saved as either individual sample files, or the sampling results for a time period (week, month) may be collected and stored as Excel files.

The system allows and controls the introduction of the sample using either: 1) direct pressure from the industrial process, 2) peristaltic pump or 3) centrifugal pump.

The system has a process control option that allows the system to activate a relay (i.e. valve) if a user defined THM concentration is exceeded.

The system has a wireless communication option allowing for a deployment of the system within industrial environments without the requirement of a communication cable.

The system can be reconfigured for deployment at remote locations.  The system can be powered by solar cells/wind turbine and wireless communications at remote locations.  This configuration is used when monitoring groundwater or surface water locations.



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6100 South Maple Avenue, Suite 114 • Tempe, Arizona 85283 • (480) 968-5141 voice • (480) 345-7633 fax • burge@burgenv.com