QSAR parameters for toxicity of organic chemicals to Nitrobacter

Article Abstract:

The effects of toxic chemicals on the environment can be tested using bioassay test organisms such as Nitrobacter. A Nitrobacter culture was created and tested with the quantitative-structure-activity relationships (QSAR) analysis. When the solution reached equilibrium, bioassays were performed using the serum bottle technique. Results proved both the effectiveness of the serum bottle technique in determining 50% inhibition concentration (IC)(sub 50) of chemicals, and the QSAR's ability to predict toxicity effects on Nitrobacter.

Methods, Biological assay, Bioassay, Toxicity testing, Toxicity tests

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Removal of 1,2 dibromo-3-chloropropane by countercurrent cascade air stripping

Article Abstract:

Validation of the cascade air stripping (A/S) system for removing volatile organic contaminants from ground waters was studied using a prototype scale. Comparison of the efficient removal of 1,2 dibromo-3-chloropropane from ground water and power requirements between conventional and cascade A/S was also studied. It was found that the cascade A/S system removed more than 95% of low-volatility contaminants and used less power than conventional A/S systems.

Environmental aspects, Water, Water treatment, Organic water pollutants, Organic water pollution, Dibromochloropropane

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QSAR parameters for toxicity of organic chemicals to nitrobacter

Article Abstract:

A discussion on the suitability of using Nitrobacter sp. as a test for toxicity of organic chemicals is presented. Suggestions are made for a full investigation of the metabolic characteristics of the bacteria since the organism exhibits remarkable adaptive properties. Unexpected growth and increasing tolerance levels to free ammonia was observed. Yet, Nitrobacter sp. does exhibit tremendous possibilities when subjected to deadaptive techniques.

Health aspects, Organic compounds, Environmental engineering, Bacteria, Nitrifying, Nitrobacteraceae

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