Metals

Metals Extractions

TTLC

TTLC stands for Total Threshold Limit Concentration. This is how metals results are normally expressed for solid samples. If you do not specify a special extraction procedure on your chain of custody your metals will be reported as TTLC values.

STLC

STLC stands for Soluble Threshold Limit Concentration. 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. The extraction procedure mimics what will happen to a given material as it is exposed to normal climatic conditions in a landfill over time. When this extraction is used solid matrices will be reported in liquid units.

TCLP

TCLP stands for Toxicity Characteristic Leaching Procedure. This extraction is one of four characteristics used to identify hazardous waste; the other three are Ignitabilty, Corrosivity and Reactivity. The TCLP extraction is designed to simulate the climatic leaching action expected to occur in landfills. It identifies and quantifies 8 metals and 25 organic compounds (pesticides, herbicides, etc.) with the potential to leach into ground water. When this extraction is used, solid matrices will be reported in liquid units.

When to Do a STLC Extraction

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.

Substance	STLC (mg/L)	Range of TTLC Values for Which an STLC Must Be Done	Wet Weight TTLC (mg/kg)
Antimony	15	≥ 150 mg/kg	500
Arsenic*	5	≥ 50 mg/kg	500
Barium*	100	≥ 1000 mg/kg	10,000
Beryllium	0.75	≥ 7.5 mg/kg	75
Cadmium*	1	≥ 10 mg/kg	100
Chromium 6*	5	≥ 50 mg/kg	500
Chromium*	5	≥ 50 mg/kg	2,500
Cobalt	80	≥ 800 mg/kg	8,000
Copper	25	≥ 250 mg/kg	2,500
Lead*	5	≥ 50 mg/kg	1,000
Mercury*	0.2	≥ 2 mg/kg	20
Molybdenum	350	≥ 3,500 mg/kg	3,500
Nickel	20	≥ 200 mg/kg	2,000
Selenium*	1	≥ 10 mg/kg	100
Silver*	5	≥ 50 mg/kg	500
Thallium	7	≥ 70 mg/kg	700
Vanadium	24	≥ 240 mg/kg	2,400
Zinc	250	≥ 2,500 mg/kg	5,000
*TCLP Metals 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. For example – The TTLC limit for antimony is 500 mg/kg and the STLC limit is 15 mg/L. If your TTLC result is 150 mg/kg or higher they you must do a STLC for antimony.

Metals Scans

CAM 17 Metals

Antimony, Arsenic, Barium, Beryllium, Cadmium, Chromium, Cobalt, Copper, Lead, Mercury, Molybdenum, Nickel, Selenium, Silver, Thallium, Vanadium, Zinc

TCLP Metals

Arsenic, Barium, Cadmium, Chromium, Lead, Mercury, Selenium, Silver

SWAT Metals

Antimony, Arsenic, Barium, Beryllium, Cadmium, Chromium, Cobalt, Copper, Lead, Manganese, Mercury, Molybdenum, Nickel, Selenium, Silver, Thallium, Vanadium, Zinc

ICAP Metals

Aluminum, Antimony, Arsenic, Barium, Beryllium, Boron, Cadmium, Calcium, Chromium, Cobalt, Copper, Iron, Lead, Manganese, Mercury, Molybdenum, Nickel, Potassium, Selenium, Silver, Sodium, Vanadium, Zinc

Priority Pollutant Metals

Antimony, Arsenic, Beryllium, Cadmium, Chromium, Copper, Lead, Mercury, Nickel, Selenium, Silver, Thallium, Zinc

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