Standard Methods: 4110C: Anions in Water by Ion Chromatography
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Official Method Name
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Test Method C. Single-Column Ion Chromatography with Direct Conductivity Detection |
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Current Revision
| Standard Methods Online |
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Media
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WATER |
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Instrumentation
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Ion Chromatography |
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Method Subcategory
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Inorganic |
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Method Source
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Citation
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Brief Method Summary
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An aqueous sample is injected into an ion chromatograph consisting of an injector port, analytical column, and conductivity detector. The sample merges with the eluent stream and is pumped through the analytical column where the anions are separated on the basis of their affinity for the active sites of the column packing material. Direct conductivity detection without chemical suppression is used to determine concentrations. |
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Scope and Application
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This method is applicable, after filtration to remove particles larger that 0.45 um, to surface, ground, and wastewaters as well as drinking water. Some industrial process waters, such as boiler water and cooling water, also may be analyzed by this method. |
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Applicable Concentration Range
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None given |
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Interferences
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Any substance that has a retention time coinciding with that of any anion to be determined and produces a detector response will interfere. Low-molecular-weight organic acids, bromate, and chlorite may interfere with the determination of chloride and fluoride. |
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Quality Control Requirements
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Preferably check recovery daily at reporting level using a reporting-level standard. Recovery should be between 75 and 125%. Alternate analysis of mid-range and high-range check standards after each 10 samples. Recovery should be between 90 and 110%. If the results are to be used for environmental compliance monitoring, document precision and accuracy of the method by the analysis of four replicates of a mid-range calibration standard and calculation of the average percent recovery, and the standard deviation of the recoveries, for each analyte. Additional QC may be required for regulatory purposes. |
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Sample Handling
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Collect samples to be analyzed for chlorite in opaque containers and store them at 4oC. All of the oxyhalides, including chlorite, require preservation with 50 mg/L ethylenediamine (EDA). |
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Maximum Holding Time
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None given |
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Relative Cost
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$51 to $200 |
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Sample Preparation Methods
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