EPA-NERL: 325.3: Chloride by Titrimetry
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Official Method Name
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Chloride (Titirmetric, Mercuric Nitrate) |
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Current Revision
| Issued 1971; Editorial Revision 1978 and 1982 |
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Media
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WATER |
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Instrumentation
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Titration |
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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 acidified sample is titrated with mercuric nitrate in the presence of mixed diphenylcarbazone-bromophenol blue indicator. The end point of the titration is the formation of blue-violet mercury diphenylcarbazone complex. |
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Scope and Application
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This method determines chloride in drinking, surface, and saline waters; domestic and industrial wastes. |
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Applicable Concentration Range
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The method is suitable for all concentration ranges of chloride; however, a sample aliquot containing no more than 10-20 mg/50 mL should be used. |
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Interferences
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(A) Ions: Anions and cations at concentrations normally found in surface waters do not interfere. (B) Sulfite: Sulfite interference can be eliminated by oxidizing the 50 mL of sample with 0.5 to 1 mL of H202. |
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Quality Control Requirements
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None. |
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Sample Handling
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Not Provided. |
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Maximum Holding Time
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28 days (MCAWW, Table 1). |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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