EPA-NERL: 321.8: Bromate by IC/ICP-MS
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Official Method Name
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Determination of Bromate in Drinking Waters by Ion Chromatography Inductively Coupled Plasma - Mass Spectrometry |
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Current Revision
| Revision 1.0, December 1997 |
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Media
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WATER |
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Instrumentation
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Ion Chromatography followed by Inductively Coupled Plasma - Mass Spectrometry |
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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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A sample is passed through a preparatory cartridge which removes the trisubstituted haloacetic acids that interfere with determination of bromate. The bromate in the sample is then separated from other compounds using an ion chromatography (IC) system. The concentration of bromate that is eluted from the IC system is measured using an inductively couple plasma/mass spectrometer (ICP/MS). |
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Scope and Application
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This method determines bromate in drinking water. |
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Applicable Concentration Range
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10 - 50 ug/L is suggested. |
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Interferences
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(A) Abundance sensitivity: The wing overlap of large and small peaks can interfere with small peaks. This interference can be minimized by optimizing instrument resolution. (B) Isobaric molecular ion interferences: Molecular ions formed in the plasma can interfere. Minimize interference by monitoring an appropriate isotope or using correction equations. Note: effects are minimal because most sample matrix is removed by processing. (C) Physical Interferences: Differences in sample and standard matrix (e.g., viscosity) creates differences in the response of standards and samples (due to effects on transport, nebulization, and ionization). Effects can be minimized by using the internal standard technique to quantify elements. Note: effects are minimal because most sample matrix is removed by processing. (D) Memory effects: Sample carryover can bias results, but can be minimized by rinsing the chelation column and instruments with blanks between sample analyses. (E) Loss of analyte: Low recoveries may be encountered if the sample contains chelating agents or colloids that compete with the chelation column. Acid solubilization of the sample minimizes this interference. (F) Chromatographic interferences: Known chromatographic interferences and their retention times are provided in the method, as well as extensive remedies. (G) Retention time shifts: Retention time shifts, due to weak eluent strengths and high ionic strength matrices are minimized using the conditions in the method. If shifts continue to occur, effects can be further minimized by diluting the sample. |
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Quality Control Requirements
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Initial Demonstration of Capability (IDC) and the periodic analysis of laboratory calibration blanks, fortified blanks, and calibration solutions as a continuing check on performance. |
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Sample Handling
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The pH of all aqueous samples should be tested immediately prior to analysis and adjusted to a pH of 10 if necessary. |
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Maximum Holding Time
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Not Provided. |
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Relative Cost
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$201 to $400 |
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Sample Preparation Methods
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