![]() If you have a solid sample analyzed for metals (TTLC) you must do a STLC for those metals that are 10 times or greater than the STLC limit. The limits for STLC and TTLC metals are listed below along with the range of TTLC concentrations for which a STLC extraction must be done. When this extraction is used, solid matrices will be reported in liquid units. It identifies and quantifies 8 metals and 25 organic compounds (pesticides, herbicides, etc.) with the potential to leach into ground water. The TCLP extraction is designed to simulate the climatic leaching action expected to occur in landfills. ![]() This extraction is one of four characteristics used to identify hazardous waste the other three are Ignitabilty, Corrosivity and Reactivity. ![]() TCLP stands for Toxicity Characteristic Leaching Procedure. When this extraction is used solid matrices will be reported in liquid units. The extraction procedure mimics what will happen to a given material as it is exposed to normal climatic conditions in a landfill over time. ![]() This extraction is used to determine whether certain leachable compounds are present in large enough amounts in a given material that the material needs to be dealt with as hazardous waste. STLC stands for Soluble Threshold Limit Concentration. If you do not specify a special extraction procedure on your chain of custody your metals will be reported as TTLC values. This is how metals results are normally expressed for solid samples. TTLC stands for Total Threshold Limit Concentration. ![]()
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