Good, I would say at least in your case the log reduction  is as per the Chick's law. But then you might come accross where it deviates from the Chick's law also.

I come across log reductions in compost/food and bio-solids sanitation. They are not the original source, but they may trace it back.

Have you tried any microbiology textbooks on microbial growth or sterilization

Will have a look at a few files i have over the weekend.

Andrew

Thanks Jai and Andrew

@ Jai, the log reduction value is as per or calculated from the Chick's law. But the Log-reduction terminology that associates a particular log reduction with percentage of microorganisms killed is what I am concerned about. Can it be attributed to Chick's law.

@ Andrew, I tried a few. Most text just made mention of log reduction but did not cite nor state the part linking various log reductions to percentage reduction. Please do look at a few of your files as I am expectant.

Jay.

http://microchemlab.com/log_reduction_and_percent_reduction_calculations

Hi Johnson,

The link about is good at explaining the relationship between % and log kill. I think the terminology came originally from treatment of water biosolids, please see attached file. I have found nothing I have in my HACCP references that traces back to the original references.

Sorry I have been so slow, and not that helpful.

Andrew

Thanks Andrew. The microchemlab link did shed more light. The attachment also threw more insight. I appreciate the efforts. 

No, you were not slow and you were really really really helpful.

Regards,

Jay

Johnson,

You have made my day, it is great to be appreciated.

Andrew

Can you check this 

http://www.water.nsw.gov.au/__data/assets/pdf_file/0010/559702/IS2_Surrogates-Ref-Pathogens-LRVs_final.pdf

They cited the log reduction to The Australian Guidelines for Water Recycling (AGWR) (2006)