Method 9020B is for the determination of Total Organic Halides (TOX) as chloride in drinking water and ground waters. The method uses carbon adsorption with a microcoulometric-titration detector. An aliquot of water protected against the loss of volatiles by the elimination of headspace in the sampling container, and that is free of undissolved solids, is passed through a column containing 40 mg of activated carbon. The column is washed to remove any trapped inorganic halides and is then combusted to convert the adsorbed organohalides to HX, which is trapped and titrated electrolytically using a microcoulometric detector.
This method detects all organic halides containing chlorine, bromine, and iodine that are adsorbed by granular activated carbon under the conditions of the method. Fluorine-containing species are not determined by this method.
Method 9020B is applicable to samples whose inorganic-halide concentration does not exceed the organic-halide concentration by more than 20,000 times.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 28 days from sample collection to analysis. |
| Preservatives: | Adjust to pH <2 with sulfuric acid, store samples at 4°C with no headspace in the container. Protect samples from light, |
| Required Preps: | 250mL amber glass or HDPE bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Microcoulometric-Titration Detector |
| Documentation: | 
9020B
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Total Organic Halogens | 10 |
µg/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.