EET Inc.
EET - Model SBTOX -Online Biological Toxicity Early-Warning System
FromEET Inc.
SBTOX is an online biological toxicity early-warning system which employs sulfur oxidizing bacteria (SOB) and can monitor remote locations in real time and produce an alarm when toxic substances are detected. The system offers simple and reproducible tests that can be automated.
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- Our online toxicity monitoring system using sulfur oxidizing bacteria (SOB) relies on the production of hydrogen ions (H+) which lowers the medium pH, and SO4²- which increases the electrical conductivity (EC) of the medium.
- The increase in EC and the decrease in pH indicate that SOB attached to the So particlesandoxidizedthe So to H2SO4 using O2 providedas the electronacceptor.
- In the presence of toxic chemicals, the activity of SOB will be inhibited, which will cause an increase in pH and a decrease in EC.
- Thus, toxicity can be detected using simple EC and pH meters.
- It is simple, uses little energy, and its sensitivity is not reduced by turbid waters.
- Long term operation (months) compared to other sensors that have to be maintained for feeding every week.
- Periodic calibration of pH and EC meters is not needed.
- No toxic byproducts are produced - the total mass of sulfate produced is low.
- High sensitivity - contaminants are detected in the low ppb range due to the low operating pH.
- High accuracy and stability since three different sensors are simultaneously operated.
- Since the SOB biosensor gives a biological response to toxicity, the response is to the additive and synergistic effects of multiple contaminants which is likely a better predictor of overall toxicity than the measurement of individual chemicals.
