Microbiological toxicity tests using standardized ISO/OECD methods-current state and outlook

Area of Science:

• Environmental Science
• Microbiology
• Ecotoxicology

Background:

• Microbial toxicity tests are crucial for environmental risk assessment of chemicals.
• Standardized tests from ISO and OECD are widely used globally.
• These tests predict chemical effects in aquatic environments and inform biodegradation studies.

Purpose of the Study:

• To review microbial toxicity tests, including standardized and non-standardized methods.
• To discuss their advantages, disadvantages, sensitivity, and usefulness.
• To demonstrate the impact of microbial toxicity tests on biodegradation assessments.

Main Methods:

• Description and discussion of various standardized and non-standardized microbial toxicity tests.
• Comparison of microbial toxicity tests with other ecotoxicological methods.
• Introduction of a new concept: physiological potential of an inoculum (PPI).

Main Results:

• Standardized microbial toxicity tests exhibit significant differences in sensitivity and applicability.
• Integrating microbial toxicity and biodegradability tests provides a new approach for inoculum characterization.
• Microbial toxicity and ecotoxicity tests form a powerful toolkit for assessing chemical toxicity.

Conclusions:

• Microbial toxicity tests are essential for environmental safety and biodegradation prediction.
• A combined approach using toxicity, biodegradability, and ecotoxicity tests enhances chemical risk assessment.
• The proposed physiological potential of inoculum concept aids in characterizing microbial inocula.