This method is for the determination of total organic carbon (TOC) in ground water, surface and saline waters, and domestic and industrial wastes. Organic carbon is measured using a carbonaceous analyzer which converts the organic carbon in a sample to carbon dioxide by either catalytic combustion or wet chemical oxidation. The carbon dioxide formed is measured directly by an infrared detector or converted to methane and measured by a flame ionization detector. The amount of carbon dioxide or methane in a sample is directly proportional to the concentration of carbonaceous material in the sample.
Method 9060 is most applicable to measurement of organic carbon above 1 mg/L.
Carbonaceous analyzers are capable of measuring all forms of carbon in a sample. However, because of various properties of carbon-containing compounds in liquid samples, the manner of preliminary sample treatment as well as the instrument settings will determine which forms of carbon are actually measured. The forms of carbon that can be measured by this method are: 1. Soluble, nonvolatile organic carbon: e.g., natural sugars. 2. Soluble, volatile organic carbon: e.g., mercaptans, alkanes, low molecular weight alcohols. 3. Insoluble, partially volatile carbon: e.g., low molecular weight oils. 4. Insoluble, particulate carbonaceous materials: e.g., cellulose fibers. 5. Soluble or insoluble carbonaceous materials adsorbed or entrapped on insoluble inorganic suspended matter: e.g., oily matter adsorbed on silt particles.
Carbonate and bicarbonate carbon are interferences with this method and must be removed or accounted for in the final calculation.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 28 days from sample collection to analysis. |
| Preservatives: | Keep samples cool (4°C) and protect from sunlight and atmospheric oxygen. In instances where analysis cannot be performed within 2 hr from time of sampling, the sample is acidified adjust to pH < 2 sulfuric acid. |
| Required Preps: | 250mL glass or HDPE bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Carbonaceous Analyzer |
| Documentation: | 
9060A
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Carbon | C |
7440-44-0 |
1 |
mg/L |
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.