I think that your question has different aspect that should be realized.

In the USA, it sounds like you are interested in the SW-846 methods, specifically the Toxicity Characteristic Leaching Procedure (TCLP). It has regulatory toxicity characteristic thresholds for waste.

Here are a few links

https://archive.epa.gov/epawaste/hazard/web/html/faq_tclp.html

https://en.wikipedia.org/wiki/Toxicity_characteristic_leaching_procedure

https://www.epa.gov/hw-sw846/sw-846-test-method-1311-toxicity-characteristic-leaching-procedure

https://www.epa.gov/hw-sw846

California also has the Waste Extraction Test (WET).

http://ccelearn.csus.edu/wasteclass/mod6/mod6_05.html

Thank you Max for providing valuable information.

Actually, TCLP limits are mainly used to classify hazardous nature of waste. In my case the waste is already non-hazardous and I want to reuse the fine fraction of degraded non-hazardous waste in off-sites applications (such as earth-fills etc). Therefore, I am just wondering about the regulatory limits.

Thanks again,

Mohit

Hi Mohit. You can go through Wisconsin State Legislature's NR 538 Beneficial Use of Industrial Byproducts. The document defines the leachability limits of heavy metals from different industrial byproducts and categorizes them into 5 different categories and defines whichever area is safe for the material's applicability. Hope this solves your query. I am attaching the Appendix of NR 538 that defines these limits and categories.

Thanks Aali Mam, it will help me.