This method is for the determination of sulfates from ground water, drinking and surface waters, and domestic and industrial wastes containing 10 to 400 mg Sulfate/liter. Solid barium chloranilate is added to an aliquote of sample containing sulfate producing a barium precipitate which releases the highly colored acid chloranilate ion. Analysis is performed using an automated colorimeter. The color intensity in the resulting chloranilic acid solution is proportional to the amount of sulfate present.
Samples should be centrifuged or filtered before analysis.
Cations such as calcium, aluminum and iron interfere by precipitating the chloranilate. These ions can be removed using an ion-exhange column.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 28 days from sample collection to analysis. |
| Preservatives: | Store samples at 4°C. |
| Required Preps: | 250 mL HDPE or amber glass bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Colorimeter |
| Documentation: | 
9035
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Sulfate | SO4 |
14808-79-8 |
10 |
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.