Total Organic Carbon (TOC)
-By Method 5310 B
The high-temperature combustion method has been used for a wide variety of samples, but its utility is dependent on particle size reduction because it uses small-orifice syringes.
The sample is homogenized and diluted as necessary and a microportion is injected into a heated reaction chamber packed with an oxidative catalyst such as cobalt oxide, platinum group metals, or barium chromate. The water is vaporized and the organic carbon is oxidized to CO2 and H2O. The CO2 from oxidation of organic and inorganic carbon is transported in the carrier-gas streams and is measured by means of a nondispersive infrared analyzer, or titrated coulometrically.
Because total carbon is measured, inorganic carbon must be removed by acidification and sparging or measured separately and TOC obtained by difference. Measure inorganic carbon by injecting the sample into a reaction chamber where it is acidified. Under acidic conditions, all inorganic carbon is converted to CO2, which is transferred to the detector and measured. Under these conditions organic carbon is not oxidized and only inorganic carbon is measured. Alternatively, convert inorganic carbonates to CO2 with acid and remove the CO2 by purging before sample injection. The sample contains only the nonpurgeable organic carbon fraction of total carbon: a purgeable organic carbon determination also is necessary to measure TOC.
|Method 5310 B|
|Hold Time||7 days|
|Preservation||H2SO4 to pH < 2, holding at 4°C with minimal exposure to light and atmosphere.|
|Sample Volume||250mL HDPE bottle|
|Collection Method||Grab sampling|
|Method Refernce||5310 B|
* The typical detection limits and analytes are displayed for this particular method. Please contact Specialty Analytical if other analytes or detection limits are required in addition to the 200.8 Analyte List.
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