Biolubricants : How to choose the right ultimate biodegradability test method ?

The use of bio-based materials is beneficial with reference to the fossil resources depletion, the climate change and the water and soil pollution. In some application the lubricant is directly widespread in the nature due to its normal use like in the loss lubrication ; in some other applications, leakages or accidents leads to contaminate the environment. Moreover, it is recognised that, in Europe, more than 1 million ton per year is not recovered.

The biodegradability of the final product is a key parameter so its evaluation has to be done with the most suitable test method.

Overview of the ultimate biodegradability test methods

First the difference between the primary and ultimate biodegradation will be done. The complete presentation (to download at the end of the article)  will review the biodegradation principles, the related test methods and the factors which have a positive effect on the biodegradation.

The most requested tests for lubricants are carried out according to OECD 301B and OECD 301F. Details of the test methods are given hereafter in the full document.

BIODEGRADABILITY EVALUATION

Biolubricants : a poorly water-soluble organic compounds

Poorly water-soluble organic compounds are classified as difficult test substances and require appropriate preparation and introduction methods to achieve satisfactory and reliable test results. The ISO 10634 is a guidance for the preparation and treatment of poorly water-soluble organic compounds for the subsequent evaluation of their ultimate biodegradability in an aqueous medium.

The following presentation will show you the restrictions on the applicability and selection of the test methods dedicated to biolubricants.

Conclusion

Based on the applicability of the ultimate biodegradability test methods, the description of some techniques for introducing the poorly-soluble organic test compounds included direct addition, , ultrasonic dispersion, adsorption on an inert support and dispersions or emulsions will result the most suitable test ultimate biodegradability test method.

>>Dowlownd the full presentation ” Biolubricants : How to choose the right ultimate biodegradability test method ?”

>>Get more info on BfB Oil Research biodegradability tests 

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