Hi
I've soil extractions by TCLP for contaminated soils by Cd, Cr, Ni, Pb, Sb and Zn from a shooting range. These extractions were applied to untreated and treated soils with different nanoparticles as ammendment to reduce available content.
I've the final values of each extraction but I've seen some differences between papers when they calculate and put the data. Final results are expressed in mg/kg, mg/L or as leachability of x element from the x total concentration (%)?
From what percentage is considered a good reduction and to talk that amendments are adequate?
Other question. There are any recent guideline for contaminated soils with references values for each element? USEPA has any actualization from the original TCLP method?
Regards and thank you in advance
1, USEPA uses mg/L. actually if you follow the TCLP method strictly, the units are exchangeable.
2. as long as you can reduce the TCLP metal levels under the limits (e.g. TCLP Pb < 5 ppm), you have a good reduction rate
3. here is a reference
https://www.epa.gov/sites/production/files/2015-12/documents/1311.pdf
USA EPA has TCLP values for several contaminants in mg/L. The TCLP is designed to determine the mobility of both organic and inorganic analytes present in wastes. This value is usually used to determine if a waste may meet the definition of hazardous waste. TCLP values (mg/L) are used to compare the reduction in
Although TCLP is not the correct method, the values (mg/L) obtained are used to compare the reduction in leaching before and after the addition of amendments. SPLP is a better method for assessing the leaching.
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